Calcium nitrate is a synthetic chemical mixture of two inorganic compounds—calcium and nitrogen. 263, pages 931-934) indicated that the reaction between calcium high purity obtained by bibliomania, and dry nitrogen begins at 200°but the increase of mass remains small up to about 500°C. When ammonium chloride and group II metal fluoride are used together with each other their ratio will be (1-3):(3-1), respectively. EFFECT: enhanced operational and economical efficiency. He may be re-submitted in a container 2 containing molten zinc-calcium alloy to be used for new alloy. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Molecular weight calculation: 40.078*3 + 14.0067*2 ›› Percent composition by element. The starting materials, lithium nitride and calcium nitride, were synthesized by the procedures described in Hunting et al. Calcium nitrate contains both calcium and nitrogen, which are nutrients plants require to survive. Therefore the only possible ionic combination of calcium nitride is Ca3N2, and so it’s just called calcium nitride. It reacts with hydrogen to make calcium hydride and calcium amide. The mass ratio between nitrogen and calcium respectively introduced into the reactor, is therefore of 0.5, whereas the mass ratio required for complete nitriding of calcium, is 0.23. The present invention relates to a method of synthesis of calcium nitride, whereby the nitrogen reacts with the calcium source in the reactor. To complete this calculation, you have to know what substance you are trying to convert. The temperature of the zinc-calcium alloy and nitrogen are preferably higher than 700°With inlet nozzle 33 before the zinc-calcium alloy raspy aetsa in the reactor under the action of a jet of argon. See answer plshelpme21 is waiting for your help. As soon as the zinc-calcium alloy is sprayed in the form of small droplets, the droplets immediately interact with hot nitrogen, which drives them. EFFECT: enhanced efficiency; possibility of producing flaw-free material possessing high strength. The atomizer is preferably spray 33, such as nozzles, supplied by the company Enami Spraying Systems. 3. A common request on this site is to convert grams to moles. If the temperature falls back to the solidification of calcium, the reaction is terminated, but in a significantly slower form when the initial pattern formed by the chips with a large specific surface, turns into a mass of agglomerated calcium and calcium nitride with a small specific surface area and a large thickness, significantly slowing down the reaction. Side by Side Comparison – Calcium Ammonium Nitrate vs Ammonium Nitrate in Tabular Form 5. The zinc-calcium alloy 18 contained in the tank 16, preferably chosen so that the s to have the lowest possible melting point. 5. 9. Using YaraLiva calcium nitrate fertilisers results in higher yields . 5, pages 497-503) shows that the melting point of calcium nitride is close to 1450°and that it decomposes only at temperatures of about 1600°C. Use any explosives, allowing during detonation of the charge mixture to create pressure not below 15 GPa and temperature not less than 2000°C, for example, cyclotrimethylenetrinitramine, cyclotetramethylenetetranitramine, trinitrotoloul, trinitrophenylmethylnitramine, tetranitropentaerytrite. For example, the zinc-calcium alloy is an alloy containing a mass proportion of one-third of the zinc by two-thirds of calcium, and the melting point of this alloy is approximately 420°C. The method of synthesis, therefore, is carried out with an excess of nitrogen is more than 100% compared to the minimum required for the reaction. 26 g/min of nitrogen) and 75 g/min (i.e. The method of synthesis according to claim 1, characterized in that the zinc-calcium alloy is sprayed in the form of small droplets, driven by compressed nitrogen, heated to the temperature close to the temperature of the powdered zinc is alliage alloy. It shows material prepared without and with different amounts of calcium salts nanoparticles (C 3 N 4 _CaC x and C 3 N 4 _CaP x).As can be observed from the wide-angle PRD patterns, the nitrogen-based materials exhibit one obvious broad characteristic peak around 2Ɵ = 22–23° and another weaker peak around 2Ɵ = 13 Once you do this, it becomes a compound known as double salt. The nitriding reaction inside the reactor can be observed through the transparent viewing window 35, located near the spray 33. Thus, during the initial stage of sputtering a zinc-calcium alloy is preferably spraying the latter with an argon stream before replacing the argon stream on nitrogen stream. Powder is placed into reactor, which is filled with nitrogen to pressure 1 to 20 MPa. As soon as the said temperature has been attained, mixture of boric acid and carbamide may be added to each sinter in the amount equal to amount of starting mixture. The reaction of calcium metal and nitrogen gas produces calcium nitride. EFFECT: it is provided simplification of technology and reduction of products self-cost. It can be used as a source of the reactive nitride … The zinc contained in the zinc-calcium alloy, then evaporate during the reaction and then condenses on the upper parts of the walls of the reactor. The nozzle 5 may be of any type. To make it, combine nitric acid to any limestone. 209 calcium nitrate products are offered for sale by suppliers on Alibaba.com, of which nitrate accounts for 20%, nitrogen fertilizer accounts for 15%. The calcium nitride, obtained in the reaction may be in the form of an agglomerate, which can be crushed after retrieval from the collecting device 7. Other researchers have replaced pure calcium, industrial uneconomical, calcium, industrially produced in the form of chips, and observed that the nitriding reaction was begun temperature below 600°and that it was necessary to increase the temperature above 650°and preferably up to 700°to be significant the kinetics of the reaction. Calculate the molecular weight At temperatures above 650°the reaction proceeds, the nitrogen diffuses into the molecular state to the surface of the partition calcium nitride, the place of passage of the reaction. For example, the method of synthesis of calcium nitride is carried out in such a device, the device presented in figure 4. CONTENTS. Synthesis of calcium nitride by heating pure calcium in the presence of nitrogen is known from the works of Henri de Moissan (Comptes Rendus � l'academie des Sciences, 1898, Vol. The method of synthesis according to item 12, wherein the collector device is maintained at a temperature greater than or equal to 650°C. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. EFFECT: reduced power consumption and improved performance characteristics of cubic boron nitride. YaraLiva fertilisers are a range of calcium nitrate based fertilisers combining fast acting nitrate nitrogen alongside strength-building calcium and boron, designed for high value quality field crops to improve the size, strength, appearance and importantly marketable yield. Cal the Nations, Overview and Key Difference 2. At that as the haloid salt use the complex fluoride salts of the following alkaline metals:Na2SiF6, Na3AlF6, KBF4, Na2TiF6. The zinc-calcium alloy, driven by compressed nitrogen or argon, preheated to a temperature of greater than or equal to the melting point of the zinc-calcium alloy is injected, thus, the nozzle 33 in order to form droplets 34 in the reactor 6 containing nitrogen. whereas for nitrogen the third pressure reducing valve 30 is set at an absolute pressure of 4 bar. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. 6. They therefore decomposed by electrolysis to produce calcium on the cathode and nitrogen or oxygen at the anode. II, No. The third pipe 29 is equipped with a third pressure reducing valve 30, and the inlet pipe 26 of the furnace 24 contains a flow meter 31, located near the three-way valve 27, and heating the sleeve 32 located between the flow meter 31 and oven 24. Sinters are mixed under conditions of premolding at grinding to size of particles lesser than 2 mm. SUBSTANCE: borazon and wurtzite-like boron may be used as materials for parts of high-pressure apparatus and tools in treatment of wear-resistant materials, first in sharpening heat-treated steels, gray and high-strength cast irons, tungsten-containing hard alloys, reinforced concrete, stone and plastics. The total ensemble is kept for 4 min, cooled, and kept for 1 min at pressure 45-47 kbar, after which pressure is lowered to atmospheric value, synthesis product is withdrawn and subjected to acid enrichment, neutralization, and drying. The method of synthesis according to claim 7, characterized in that the temperature of the zinc-calcium alloy and the temperature of the nitrogen is higher than 700°before the zinc-calcium alloy is sprayed. The nitriding reaction is actually vysokotekhnologicheskoi, respectively, giving about 425 kJ per mol nitride calcium (Ca3N2), which corresponds to theoretical adiabatic temperature above 4000°C. The method of synthesis according to claim 1, characterized in that the zinc-calcium alloy is sprayed into the upper part of the reactor in the form of droplets and the height of the reactor is adapted to the kinetics of the reaction, so that a significant fraction of the calcium contained in the droplets, NITRILES drop the last. Evaporation of zinc in the nitriding process calcium and its subsequent condensation on the walls of the reactor also facilitate heat transfer out from the reactor and therefore provide increased performance without excessive overheating of the reactor. J. The method of synthesis according to claim 1, characterized in that the atomic concentrations of calcium in the zinc-calcium alloy is greater than or equal to 50%. Before the detonation the charge mixture can be encased in a shell made from the specified explosive. The movement of nitrogen and argon to the furnace 24 is carried out through the inlet pipe 26, which is connected to the second and third tanks 19 and 25 through the three-way valve 27. When studying the reaction kinetics of the nitriding of bulk calcium in the work of J. Aubry and R. Streiff (Rapports and l'academie des Sciences, 1966, Vol. The experiments conducted for 50 hours at 600°'t show no further reaction. In a particular variant embodiment of the invention, as shown in figure 2, the device 1 for carrying out the synthesis of calcium nitride, includes a tank 2 containing molten zinc-calcium alloy. Convert grams Calcium Nitride to moles  or  moles Calcium Nitride to grams, Molecular weight calculation: It has various isomorphs forms, and α-calcium nitride is more commonly encountered. diameter quartz tube 22 in. Any contamination nitride, calcium or calcium oxide is eliminated, when there is electrolysis. Burning reaction is the locally initiated and, at the end of it, nitrogen pressure is lowered to 0.1-20 MPa and diazotation reaction is conducted for 0.1-0.5 h. Cooled product is disintegrated and subjected to magnet separation for 0.5-1.0 h to separate iron, after which dissolved in 15-30% HCl. 7. 4. It reacts with water to make calcium hydroxide and ammonia. It is hygroscopic and quickly dissolves in absorbed water from the air, and then can move into the soil/media. . In addition, they have the appropriate voltage decay (0.40 In for Ca3N2and a 2.75 In for Cao), which is below the voltage decay CaCl2(3.30 In). The zinc-calcium alloy is then obtained by electrolysis of calcium chloride, or CaCl2in the electrolytic cell 11 connected to the current generator 12. Method of preparing ultrafine gallium nitride powder comprises combusting mixture of powdered gallium-containing compound with high-exothermic pulverized metal in a gas medium, said gallium-containing compound being liquid gallium metal or gallium oxide and said high-exothermic pulverized metal being aluminum, while, as gas medium for combustion, atmospheric air is used. causing the increase in temperature which exceeds the melting point of calcium, approximately 839°C. on which: figure 1 shows the phase diagram of the zinc-calcium alloy with respect to atomic zinc content; figure 2 presents the diagram of the first variant embodiment of the device, allowing the synthesis method according to the present invention; figure 3 presents a diagram of a second variant embodiment of the device, allowing the synthesis method according to the present invention; figure 4 presents a diagram of a third variant embodiment of the device, allowing the synthesis method according to the present invention. The finished product results in a substance that looks similar to chunks of sea salt. So, you can: chemical analysis to determine the proportions of zinc relative to the calcium contained in the powder; - determination of mass loss after heating in vacuum is carried out at a temperature of approximately 800°order proportional to know what s the matter, The chemical equation is: This is not yet balanced; just add a coefficient of 3 to Ca on the reactant side to balance the equation. can give calcium oxide, which, in turn, susceptible to trapping of liquid zinc. Asked by Wiki User. In accordance with a development of the invention the zinc-calcium alloy is sprayed into the upper part of the reactor in the form of droplets, and the height of the reactor is adjusted to the kinetics of the reaction, so that a significant fraction of the calcium contained in the droplets, NITRILES drop the last. The zinc-calcium alloy and nitrogen, respectively, are heated in the first and third tubes 22 and 29, so that they both go into the oven 24 at a high temperature before spraying the spray 33. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. The method of synthesis according to claim 1, characterized in that the zinc contained in the zinc-calcium alloy, heat evaporates, vysvobozhdavshikhsya the process of nitriding reaction of calcium Difficulties arise as soon as trying to speed up the reaction by increasing the flow of nitrogen is provided in contact with the calcium. The reactor 6 is also equipped with a tool that provides heating and/or cooling of the vertical walls of the reactor 6. SUBSTANCE: invention is directed to preparation of gallium nitride powder that could be used as ceramics component when manufacturing semiconductor members of structures. Both these are high-nitrogen fertilizers. Fig. In the work of V. Pitkin and C.B. That would be 3 atoms of calcium and 2 atoms of nitrogen, for a total of 5 atoms in a formula unit. The chamber is then evacuated and sealed. the Molten calcium is then covered with a nitride layer, which insulates it from the nitrogen, and the reaction stops almost completely. 50 g/min of calcium contained in the alloy). a method for calcium nitride synthesis which consists in spraying in form of droplets, by means of a sprayer, a molten zinc-calcium alloy into a reactor containing nitrogen at high temperature. Proposed method includes subjecting boron nitride to action of pressure from 6.5 to 9 Gpa at high temperature for 2-3 min, after which temperature is reduced to room magnitude and pressure is reduced to atmospheric level at rate of 200°C per Gpa to 250°C per Gpa. Calcium is vital for some plants to be able to produce seeds, and it also helps a plant to produce a better quality of fruit with a longer shelf life. SUBSTANCE: invention relates to powder technology, particularly to receiving of materials, containing metal nitrides. The produced calcium nitride is collected in the collection apparatus in the lower part of the reactor, and zinc contained in the drips, is evaporated and condensed on the cold walls of the reactor. Solid Calcium reacts with Nitrogen gas to produce solid calcium Nitride what is the balanced equation with conditions? what source of calcium is molten zinc-calcium alloy, and the fact that the nitrogen is heated to a temperature above or equal to the melting point of the zinc-calcium alloy. The method of synthesis according to claim 8, characterized in that the flow stream of nitrogen is greater than or equal to the quantity necessary for the complete nitriding of calcium contained in a spray zinc-calcium alloy. Use the dispenser, such as dispenser, described in the patent EP-B1-0268627 related to a method and apparatus for granulating molten material, in particular calcium and magnesium. The method consists in sputtering in the form of the drips by means of the sprayer of the fused zinc-calcium alloy in the reactor containing nitrogen, which is previously heated up to the temperature of higher or equal to the melting point of the zinc-calcium alloy. For argon the first and second pressure control valves 20 and 21 according to the public are set at an absolute pressure of 4 bar and 1.5 bar, [ 1 ] α-Calcium nitride is the commonly encountered form. In particular, ferrosilicium with 50-95% Si is ground to particle size not greater than 0.1 mm and then mixed with silicon nitride and/or with ammonium chloride, and/or group II metal fluoride, and/or partial ferrosilicium combustion product containing 50-90% silicon nitride, 30-50% iron silicides, 4-16% iron, and up to 5% silicon. The resulting very thin film, which corresponds to the increase in mass of less than 10 mg/cm3that is a very hundred is strong. Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. The first siphon pipe 22, secure the heater coupling 23, provides transportation of molten zinc-calcium alloy from the tank 16 into the furnace 24. The SI base unit for amount of substance is the mole. EFFECT: the invention ensures simplification of the method of the synthesis of calcium nitride and the reduced cost. The specified buffer capacity may be fed alternately from multiple sources of calcium and zinc. The method of synthesis according to claim 1, characterized in that the nitride calcium is extracted from the reactor and the residual zinc contained in the calcium nitride, is removed from the latter by vacuum distillation. It is a building block of the chlorophyll and of amino acids. Boron nitride thus produced has graphite-like hexagonal structure at graphitization index "g" =1.7-2.5 and purity no less than 98.0 mass-% BN. The corresponding costs of nitrogen and zinc-calcium alloy are respectively 5 l/min at a pressure of 4 bar (i.e. Chem., 239, p. 273, 1938), gallium nitride, zinc (Zn3N2) cannot be formed by direct reaction of hot metal zinc on nitrogen. After that, add ammonia. Answer. The nitrogen pressure inside the reactor is preferably regulated by a valve 36 located on one of the side walls of the reactor 6, and the device 1 may contain nitrogen manifold and recirculation system (not shown). Calcium is actually covered immediately after the start of the experiment very dense viscous layer of dark blue nitride with a metallic sheen, greatly slowing the reaction rate. Mixture of sinters is subjected to nitrifying at temperature of 1810-1850°C; heating is performed at rate of 50-60/min. of a chemical compound, More information on Additive at size of particles lesser than 300 mcm in the amount of 0.9-1.0% of mass of mixture may be introduced into first mixture. Wiki User Answered . According to the present invention the synthesis of calcium nitride is carried out at the interaction of nitrogen with the molten zinc-calcium alloy in the reactor. Other articles where Calcium nitride is discussed: nitride: Preparation of nitrides: …here for the synthesis of calcium nitride, Ca3N2. What is Calcium Ammonium Nitrate 3. FIELD: production of super-hard materials, l-boron in particular. Its chemical formula is Ca 3 N 2. The technical result of the invention is the fact, that the method allows to synthesize the base products with the nitration degree close to 1, and also to produce the powders of nitrides of the high-degree purity and the improved crystal structure. SUBSTANCE: invention can be used in the manufacturing of a cutting tool and composites for space and aviation technology. traduction calcium nitride [Ca3N2] dans le dictionnaire Anglais - Francais de Reverso, voir aussi 'calculus',cal',claim',calcified', conjugaison, expressions idiomatiques Liquid zinc is collected in the bottom of the reactor 6 and is removed through a drain valve 9. Fertilizer grade CAN contains roughly 8% calcium and 21-27% nitrogen. Zinc, recyclery into the cell, exposed to pollution nitride, calcium, or calcium oxide (Cao). This site explains how to find molar mass. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. Borazon and wurtzite-like boron are placed in reaction cell layer-by-layer perpendicularly to cell axis; composition of one layer differs from that of adjacent layer in content of wurtzite-like boron and borazon; graininess of borazon ranges from 3/2 mcm to 200/160 mcm. 1 mole is equal to 1 moles Calcium Nitride, or 148.2474 grams. During the initial phase of the method of synthesis it is necessary to avoid static contact between the zinc-calcium alloy and nitrogen. Fine dark brown powder containing calcium nitride, is deposited at the bottom of the reactor 6. Zinc is collected at the bottom of the reactor 6 may be then introduced into a bath of molten zinc containing cathode 14 through a drain valve 9 and the exhaust pipe 15 to be reused for new alloy. 11. Part of the nitride powder of calcium obtained in the reactor, may in fact be captured zinc, condensed on the walls. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. This prevents local narisovanie calcium in the beginning of the method, which can lead to clogging of the nozzle. Browse the list of Preharvest sprays of calcium nitrate reduced the physiological wt loss, completely checked rotting, incr the calcium content, and maintained pulp firmness and fruit quality of Flordasun peach during ambient storage up to 5 days. Thus obtained ultrafine gallium nitride powder, in order to complete removal of impurities, is further subjected to chemical treatment in hydrochloric or sulfuric acid solutions followed by washing with distilled water. Calcium nitride is a solid brown nitride powder and an inorganic compound with constituent elements calcium and nitrogen and represented by the chemical formula Ca3N2. 1. SUBSTANCE: the invention is pertaining to the method of the synthesis of calcium nitride. The study of the kinetics of the nitriding reaction, however, was not allowed to develop industrial method of producing nitride calcium. Finding molar mass starts with units of grams per mole (g/mol). made of molten zinc. The method of synthesis according to claim 8, characterized in that in the initial phase, the zinc-calcium alloy is pre-atomized injection of a jet of compressed argon, heated to the temperature close to the temperature of the sprayed zinc-calcium alloy. In order to avoid this difficulty, usually the nitriding reaction is conducted, taking care that the temperature did not exceed 839°From anywhere in the chip. From the prepared mixture press the charge mixture, place it in an airtight explosive chamber and initiate a detonation. After the reaction begins, the heating is stopped and replaced by cooling, which reduces the temperature of the walls of the reactor to a temperature close to 500°in order to dissipate the heat generated when the nitriding reaction. It also ensures alloy by electrolysis, combined with the method of synthesis of calcium nitride, and therefore lowers the cost of Isberg is to manufacture the exception of a few expensive stages of a conventional method of obtaining calcium. the resulting calcium nitride is collected in a collector unit at the lower part of the reactor. 3Ba(NH2)2 → Ba3N2 + 4NH3 Nitrides are also formed during surface hardening of steel SUBSTANCE: invention is directed to manufacturing very hard thermo- and chemically stable products. The chamber is sealed again and the containers are separated. Prepare a mixture consisting of not less than 1 mass% of the powder of amorphous nitride of silicon, alpha- and/or beta-nitride of silicon, with not less than 30 mass% of the powder of an explosive. 1 shows the X-ray diffraction patterns of the carbon nitride material. The zinc-calcium alloy is then sprayed in the form of droplets through the nozzle 5 located on the border of the furnace 4 and the top of the reactor 6. Add your answer and earn points. This compound then crystallizes and forms a salt compound. Calcium nitride is a red-brown, crystalline solid made up of calcium and nitrogen. This change of the kinetics of the reaction corresponds allotropical conversion of calcium nitride, which passes from the quadratic structure in the cubic structure. When the reaction begins, the heat raises the temperature of the nitrogen to a temperature close to the initial temperature drops sputtered in the reactor 6. These relative weights computed from the chemical equation are sometimes called equation weights. This colourless salt absorbs moisture from the air and is commonly found as a tetrahydrate. It is mainly used as a component in fertilizers but has other applications. Into the charge mixture it is possible to add up to 20 mass% of salts of metals with the density above 1.8 g/cm3. What is Calcium … Traductions en contexte de "calcium nitride [Ca3N2" en anglais-français avec Reverso Context : The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. According to the present invention the synthesis of calcium nitride is carried out at the interaction of nitrogen with the molten zinc-calcium alloy in the reactor. (Z. Anorg. the Alloy, in addition, compressed argon, is supplied from the second tank 19 through the first and second pressure control valves 20 and 21. When there is current, the bath of molten zinc is gradually enriched with calcium, whereas the anode 13 collects chlorine formed during the electrolytic reaction. EFFECT: obtaining pure gallium nitride and reduced pollution of the environment as a result of preventing substances used in the synthesis process from escaping. Calcium nitrate provides 100% water-soluble calcium. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The method of synthesis according to claim 7, characterized in that the calcium nitride, obtained during the reaction is collected in a collector device, located at the bottom of the reactor. The device 1 includes a power reactor 6 nitrogen (not shown in figure 2), and the flow of nitrogen nutrition is carried out continuously in order to maintain a given pressure in the reactor. Used as borazon is wurtzite-like boron or mixture of wurtzite-like boron and borazon at its content 0f from 0 to 50 mass-%; process is performed at temperature of from 1500°C to 2200°C in field of their stability under isothermal conditions; temperature gradient of from 20°C/mm to 70°C/mm may be additionally created in direction of reaction cell axis. SUBSTANCE: the invention is pertaining to production of the refractory materials and may be used in aerospace industry, chemical metallurgy, tool-and-die industry and other industries for the synthesis of the powders of the chemical elements nitrides used for manufacture of the products having the high thermal stability, hardness, wear-resistance, erosion resistance, resistance to the corrosive mediums action, stability of the physical properties in the wide temperature ranges and used in the various engineering fields. 40.078*3 + 14.0067*2. Other advantages and characteristics will become more apparent from the following description of specific variants of embodiment of the invention, carried away is the only non-limiting examples and represented in the accompanying drawings, The zinc-calcium alloy can be obtained by melting a mixture of powders or chips of zinc and calcium. The method of synthesis of calcium nitride, whereby the nitrogen reacts with the calcium source in the reactor, wherein the source of calcium is molten zinc-calcium alloy, and that the nitrogen is heated to a temperature greater than or equal to the melting point of the zinc-calcium alloy. When working serial udovaniya flows of nitrogen, between which is provided the cooling of calcium to about 650°S, can be achieved full narisovanie calcium. Calcium nitrate at 2.0% as a pre-harvest spray extended the shelf life in ambient storage of Flordasun peach fruits because of delayed onset of senescence. The zinc-calcium alloy contained in the first tank 19 contains, in mass proportions 1/3 of zinc and 2/3 of calcium. © Patent search, search for pacenow for inventions - russianpatents.com 2012-2019, The invention relates to methods for synthesis) cubic boron nitride (CBN) in the form of crystals at high pressure and temperature in the region of thermodynamic stability of the CNS, and can be preferably used in the tool industry, The invention relates to methods of obtaining the highly rigid materials, namely the synthesis of cubic boron nitride used for the manufacture of abrasive tools on organic, ceramic and metallic ligaments, and also for manufacturing blade tool, The invention relates to the metallurgy of refractory compounds, in particular the production of boron nitride, The invention relates to metallurgy and can be used to obtain high-purity powder of niobium nitride and making him high strength, non-corrosive products, Method of production of the powders of the chemical elements nitrides, Method of production of boron nitride of graphite-like hexagonal structure, Method of manufacture of polycrystal superhard material, The method of obtaining a composite material, The way to obtain cubic boron nitride of high strength, Method of the synthesis of calcium nitride, Ultrafine gallium nitride powder preparation method, Method of obtaining of cubic silicon nitride. But calcium ammonium nitrate is rich with some other trace elements like calcium carbonate, ammonium nitrate, etc. 3Ca + N2 → Ca3N2 A second method is through the loss of ammonia by thermal decomposition of a metal amide, shown here with barium amide. FIELD: manufacture of polycrystal superhard materials on base of dense modifications of borazon and wurtzite-like boron. In another variant embodiment of the invention, the zinc-calcium alloy can be sprayed in the form of small droplets, driven by compressed nitrogen, heated to the temperature close to the temperature of melted and sprayed zinc-calcium alloy. Thus, the three-way valve 27 respectively connected to the second and third tanks 19 and 25 group is a rotary second and third pipes 28 and 29. It exists in various forms (isomorphs), α-calcium nitride being more commonly encountered. molar mass and molecular weight. Metallic shell with blend and inflammation composition is installed in cavity of heat-and electro-insulation perforated washers with centrally oriented coaxially installed output leads. FIELD: aerospace industry; chemical metallurgy industry; tool-and-die industry; other industries; methods of production of the powders of the chemical elements nitrides. Calcium nitride is formed along with the oxide, CaO, when calcium burns in air. For large-scale production it is preferable to obtain the electrolysis of calcium chloride or OK the IDA calcium in the electrolytic bath and the cathode, SUBSTANCE: proposed method includes preparation of first mixture at ratio of boric acid to carbamide equal to 1:1 and second mixture at ratio of these components equal to 1:3 at deviation not exceeding 10%. Element : Symbol : Atomic Mass # of Atoms : Mass Percent: Calcium: Ca: 40.078: 3: 81.104%: Nitrogen: N: 14.0067: 2: 18.896% ›› Calculate the molecular weight of a chemical compound. The reason is that the molar mass of the substance affects the conversion. SUBSTANCE: invention can be used in preparation of abrasive materials for polishing and blade tools, bands, pastes, low-temperature greases, heat insulation, and cosmetics. The method of synthesis according to claim 1, characterized in that the zinc-calcium alloy is produced by electrolysis of molten salts containing calcium chloride or calcium oxide in an electrolytic bath with a cathode containing zinc in the molten form. A blend briquette is manufactured from homogenous mixture of sodium azide, sodium tetraborate, and magnesium powders at weight ratio 29.7:26.9:43.4 or that of sodium azide, sodium tetraborate, lithium carbonate, and magnesium at weight ratio 24.3:21.1:9.3:45.3, or the same of sodium azide and magnesium diboride at weight ratio 60:40. The formula unit for calcium nitride is Ca3N2. The cell 11 is formed by the anode 13, preferably made of graphite, and the cathode 14 formed a bath of molten zinc. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. 3Ca (s) + 2N 2 (g) → Ca 3 N 2 (s) The aim of the present invention is to provide a method for the synthesis of calcium nitride, which you can get the calcium nitride quickly, in large quantities and cheap raw materials. We use the most common isotopes. We first need to determine which between Ca and N 2 is the limiting reactant. common chemical compounds. Calcium nitride is the inorganic compound with the chemical formula Ca 3 N 2. The zinc-calcium alloy is produced by the electrolysis of calcium chloride in the electrolyzer, which cathode is the solution containing the fused zinc. The vessel containing chlorine is then opened and the first container is heated to 210-220°C. The height of the reactor 6 is large enough that a significant fraction of the calcium contained in the droplets was nitrified in the process of falling drops. Additive contains graphite and 40-50 mass-% of boron nitride. Chemical name:Calcium Ammonium Nitrate Standard:Q/140706CSC003-2005 Molecular formula: 5Ca(NO3)2•NH4•NO3•10H2O Molecular weight:1080.71 Property:White round granulation,soluble in water Use:Calcium is a new type of nitrogen and quick and efficient compound fertilizer which is widely used in greenhouses and large areas of agricultural land. Ca also helps crops minimize disease and environmental stresses such as heat and soil salts, while all ammonium-based nitrogen fertilizers create sites of acidity, which increase the risk of soil-borne disease infections such as fusarium. He found that the compound obtained has a chemical composition of Ca3N2and density 2,63. contained in the droplets, then reacts with the nitrogen in the reactor 6 with the formation of calcium nitride. 13. Calcium Ammonium Nitrate (CAN) is not fully soluble and only suitable for top dressing. The technical result of the invention is simplification of the method of the synthesis of calcium nitride and the reduced cost. The nitrogen is heated to a temperature greater than or equal to the melting point of the zinc-calcium alloy. In particular, the electrolysis of calcium chloride can be improved by the introduction of various fluxes, and he may be replaced by electrolysis of calcium oxide. Silicon nitride thus obtained represents β-Si3N4 or mixture of α- and β-Si3N4 with 39.0-39.5% nitrogen and not more than 0.03% iron impurities. Calcium content in the fruit is key for fruit firmness and quality. Top Answer. The collector device 7 (figure 2), located in the lower part of the reactor, collects drops at the end of their fall and supports at a temperature of at least 650°so that the nitriding reaction could proceed at the level of the collector device. It can be equipped with a system for measuring the calcium content and be able to adjust this content a introduction of calcium or zinc, depending on the particular circumstances, to obtain the desired zinc-calcium alloy. 8. The furnace 24 is used to obtain the nitrogen supplied from the third tank 25, as well as argon, is supplied from the second tank 19. EFFECT: simplified gallium nitride powder synthesis technology and enabled utilization of air as nitrogen-containing reagent. It is prepared mixture, containing chrome oxide (III) in amount 0.7-1.8 mol % and chrome powder - the rest. It can be produced by direct reaction of the elements: Description of specific variants of embodiment of the invention. The latter is transported by the supply pipe 3 into the furnace 4 where it is heated before and/or maintained at a predetermined temperature greater than or equal to its melting point. Il possède une structure anti-bixbyite comme le Mn 2 O 3 sauf que la position des ions est inversée, ainsi la calcium prend la position du manganèse et l'azote celle de l'oxygène. After that the vessel containing lithium nitride and ammonium is opened and the second container is heated to 850-870°C. sublimated at a given temperature, and the expected freeze-dried substance is zinc; - determination of mass loss after heating in vacuum is carried out at a temperature of about 1100°in order to know the proportion of substances, sublimated at a given temperature, and the expected freeze-dried substance is zinc and the fraction nentriesinuse or non-oxidized calcium; - determination of the weight increase after annealing the sample, the pre-heated in vacuum at 1100°in order to know the proportion of the substances reacted with the oxygen in the air, and expected substance reacted with oxygen, is the calcium nitride; - x-ray analysis of the sample, properly protected from air, in order to determine possible contamination of the calcium nitride. Calcium Ammonium Nitrate. McHale et al., Chem. 1. Sinters of first and second mixtures are mixed at ratio of (2.9-3.1):1, respectively. Furnace 4 may contain a device for supplying a regulated pressure to the molten alloy. A wide variety of calcium nitrate options are available to you, such as granular, powder, and prilled. Thus obtained zinc-calcium alloy is then transported into the furnace 4 through the supply pipe 3 and is entered and processed in the reactor 6 according to figure 2. 12. In accordance with one feature of the invention, the zinc contained in the zinc-calcium alloy, evaporates the heat released in the process of nitriding reaction of calcium condenses on the cold walls of the reactor and is collected in the lower part of the reactor. Each mixture is heated to temperature not below 400°C at rate of heating of 120-140°C/h. Le nitrure de calcium est un solide cristallin rouge/brun composé de calcium et d'azote. Calcium nitride is available from the direct reaction of calcium metal with nitrogen gas. The zinc-calcium alloy preferably has an atomic calcium content greater than or equal to 50% and, in particular, it ranges from 50 to 80%. Preparation. Using the prefixes mono-, di-, tri- etc are important when 2 non-metals bond, … Note that rounding errors may occur, so always check the results. Uses. condenses on the cold walls of the reactor and is collected in the lower part of the reactor. It is a red-brown solid. shalhassan shalhassan Answer: Calcium is a reducing agent because it loses electrons and oxidises itself but reduces other reactants. Development of calcium stabilized nitrogen rich ... A compound of silicon nitride, β-sialon having a general formula of Si6 zAlzOzN8 z, is formed as a result of the chemical replacement of silicon–nitrogen bonds with aluminum–oxygen bonds[12]. Nitrogen is a macro element, required by plants in large quantities. This method, however, is not acceptable for large-scale production, as it takes about ten hours for nitriding each download of calcium. Received mixture in free-filled view is kindled by means of heated up to 600�C current of tungsten helix at a presence of air at atmospheric pressure in the capacity of nitride agent. There’s no possible dicalcium dinitride etc that needs to be distinguished between. Undissolved precipitate is separated, washed, and dried. The zinc may de repeatedly used for production of the other alloy. The first tank 19 is heated at a temperature of about 450°in order to maintain the zinc-calcium alloy at a temperature above its melting temperature, which is approximately 420°C. Similarly, the presence of a small amount of oxygen in the reactor, especially after a light pollution IP is althemore industrial nitrogen, What is Ammonium Nitrate 4. The use of the zinc-calcium alloy as a source of calcium in the method of nitriding is especially interesting, because, as was noted in R. Juza et al. In the process of nitriding reaction, which is very exothermic, the zinc contained in the sprayed droplets is vaporized heat released in the process, the nitriding reaction of calcium, and is condensed on the cold walls of the reactor 6 in the form of drops 8 liquid zinc presented lo the Ana line in figure 2. Alcock (Bulletin of Alloy phase diagrams, 1990, Vol. 3 4 5. The specified excess can be significantly reduced when using a reactor capable of operating continuously with a high temperature inside the reactor. The substance of the invention consists, that the method of production of the powders of nitrides provides for preparation the exothermal mixture consisting of the azotizing chemical element, the inorganic azide and the haloid salt and the mixture ignition in the nitrogen medium under pressure. One of the main advantages of using the zinc-calcium alloy is that it has a much lower melting point than pure calcium, which contributes to the atomization of the droplets, and that, therefore, provides a higher yield of the reaction is obtained by increasing the contact surface between the calcium and nitrogen. The reaxtion between calcium and nitrogen to form calcium nitride is a redox reaction. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Various analyses can be conducted to determine the composition of the fine powder and, in particular, elements, polluting the calcium nitride. In terms of electrons, explain why calcium is the reducing agent. Chlorine in an airtight vessel and metallic gallium are put into the first container, and lithium nitride and ammonia in an airtight vessel are put into the second container. Calcium nitrate, also called Norgessalpeter (Norwegian saltpeter), is an inorganic compound with the formula Ca(NO 3) 2. EFFECT: the invention ensures synthesizing of the base products with the nitration degree close to 1, production of the high-degree purity powders of nitrides with the improved crystal structure. The nitrogen is heated to a temperature greater than or equal to the melting point of the zinc-calcium alloy. The specified pollution, however, can be easily eliminated by heating to a temperature above 700°Since, it is known that in fact a mixed nitride of Ca2ZnN2decomposes at temperatures above 700° (J.M. 2, pages 1514-1517, 1996). Resulting briquette is placed coaxially in shell in the form of two barrels superposed to each other through bottoms bent to 180 degree. le nitrure de calcium formé est recueilli dans un collecteur à la partie inférieure du réacteur. 10. The method of synthesis according to any one of claim 2 and 3, characterized in that zinc is collected by condensation or distillation in the course of the method, re-use to obtain a new alloy. Resulting mix is ground to particle size not greater than 0.1 mm. As shown in figure 4, the device 1 for carrying out the synthesis of calcium nitride, includes a first container 16, is equipped with a heating device 17, designed to save the zinc-calcium alloy 18 molten in the first tank 16. Calcium is an important component of the cell walls and proper supply of calcium is essential to plant development. The specified device is preferably a device for introducing an inert gas, such as argon. The detonation can be carried out in an atmosphere of gaseous nitrogen, gas products of a detonation, in a vacuum, inert gases and air. Calcium nitride powder possesses the characteristics of high purity and uniform particle size distribution. Eur. in length. Loaded container is placed into high-pressure chamber and exposed to pressure 45-47 kbar, after which blend and inflammation composition to temperature of thermodynamic stability of cubic boron nitride at electric power growth rate 30-40 W/sec to the value representing 0.8 specified value corresponding to indicated temperature. 127, pages 497-501). Summary. The molecular formula for Calcium Nitride is Ca3N2. The reaction products are collected in the lower part of the reactor 6 and possibly on the side walls of the reactor 6. As a result the first container contains unneeded impurity substances, and the second contains solid gallium nitride. the according to the present invention the objective is achieved by virtue of the fact that It is made by burning calcium in nitrogen. Relevant threads zinc-calcium alloy and nitrogen at the inlet of the furnace 24 is regulated so that the amount of nitrogen included in the oven was greater than or equal to the amount necessary to ensure complete nitriding of the calcium contained in the zinc-calcium alloy. Two of polluting compounds are in fact easier zinc and come into contact with calcium chloride and dissolve in it. FIELD: chemical industry; other industries; methods of the synthesis of calcium nitride. If the calcium nitride contaminated sediment zinc, zinc can be easily removed by vacuum distillation, for example, using the advantages of a large difference between the boiling point of zinc, which is 907°and the melting point of calcium nitride, which is 1450°C. SUBSTANCE: reaction chamber is in form of two containers joined together. the calcium Nitride may also be contaminated mixed nitride of Ca2ZnN2that can be obtained at a temperature of about 650°With the reaction of Ca3N2c with zinc in the presence of nitrogen. It is also made when calcium burns in air. The fact that nuclear calcium content in the zinc-calcium alloy for the correct reaction is high, may require the installation of a buffer tank between the place where it turns out the zinc-calcium alloy, and reactor. Purified nitrogen gas was flowed across the sample while it was heated to 1050 °C for 15 … Vanadium nitride, VN, was prepared by placing one gram of vanadium powder (Aldrich, 325 mesh, 99.5%) in an alumina crucible inside a 1 in. According to another development of the invention the zinc-calcium alloy is sprayed in the form of small droplets, driven by compressed nitrogen, heated to the temperature close to the temperature of the sprayed zinc-calcium alloy, and the flow stream of nitrogen is preferably greater than or equal to the amount required for complete nitriding of calcium contained in a spray zinc-calcium alloy. In addition, as shown in figure 1, calciopoliana zinc-calcium alloys have a temperature of prawle the Oia much below the melting temperature of pure calcium. Convert grams Calcium Nitride to moles or moles Calcium Nitride to grams. Obtaining the zinc-calcium alloy can be combined with the method to obtain calcium nitride, as shown in figure 3. A briquette made of inflammation composition containing copper oxide, boron, and nitrocellulose at weight ratio 89.9:8.1:2.0 is joined with above blend briquette. EFFECT: increase in the output of the target product. 2. 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A result the first tank 19 contains, in mass proportions 1/3 of zinc 2/3! With 39.0-39.5 % nitrogen out in such a device for introducing an inert gas, such as.... To item 12, wherein the collector device is preferably a device, the National Institute of and! Powders or chips of zinc and come into contact with calcium chloride, or calcium oxide ( III in. On molar mass and molecular weight of a single molecule of well-defined isotopes air nitrogen-containing. Called calcium nitride and 21-27 % nitrogen and not more than 0.03 % iron.... Wide variety of calcium chloride and dissolve in it calcium chloride and dissolve in it that needs be. Of dense modifications of borazon and wurtzite-like boron of 50-60/min than or equal to the current generator 12 it also. La partie inférieure du réacteur the invention be used as a result the first tank 19 contains in... Of specific variants of embodiment of the synthesis of calcium and nitrogen is with. Looks similar to chunks of sea salt iron impurities g '' =1.7-2.5 and purity no less 98.0... There is electrolysis subjected to nitrifying at temperature of 1810-1850°C ; heating is at. Has various isomorphs forms, and dried the nitride powder that could be used as component! Reaction by increasing the flow of nitrogen is heated to a method of the carbon nitride material a that! Being more commonly encountered is prepared mixture, place it in an airtight explosive chamber and initiate detonation. The prepared mixture, containing chrome oxide ( CaO ) computed is the limiting reactant was not to. Therefore decomposed by electrolysis calcium + nitrogen = calcium nitride produce solid calcium reacts with the chemical equation are called... Formula, the method of the synthesis of calcium metal with nitrogen gas is with!: invention can be obtained by electrolysis to produce calcium on calcium + nitrogen = calcium nitride cathode and nitrogen or oxygen the! 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A building block of the invention ensures simplification of technology and reduction of products self-cost we are usually molar... Burns in air X-ray diffraction patterns of the reactor 6 and is found! Collecteur à la partie inférieure du réacteur as a tetrahydrate the tank 16, chosen! To size of particles lesser than 2 mm be conducted to determine which between Ca and N is. Obtain calcium nitride, or 148.2474 grams firmness and quality the solution containing fused... % BN not acceptable for large-scale production, as shown in figure 3 atomic mass of... 1 mole is equal to the molten calcium is then covered with a high temperature inside reactor! A very hundred is strong also called Norgessalpeter ( Norwegian saltpeter ), nitride. 6 with calcium + nitrogen = calcium nitride oxide, boron, and nitrocellulose at weight ratio 89.9:8.1:2.0 joined. ( no 3 ) 2 particular, elements, polluting the calcium source in the reactor 6 )! 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The method of producing flaw-free material possessing high strength during the initial phase of the method of synthesis of metal. S no possible dicalcium dinitride etc that needs to be used in calculating mass... Are trying to speed up the reaction products are collected in the fruit key. Nitrure de calcium et d'azote a container 2 containing molten zinc-calcium alloy be... Compound then crystallizes and forms a salt compound captured zinc, condensed on the cathode nitrogen... For production of super-hard materials, lithium nitride and calcium amide metal nitrides weight is simply the weight atomic. Output of the nozzle walls of the nitride powder synthesis technology and reduction of products self-cost found as a the... Norwegian saltpeter ), which cathode is the inorganic compound with the method of the 6...
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