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and kept for 1 min at pressure 45-47 kbar, after which pressure is lowered to atmospheric value, synthesis product is withdrawn and subjected to acid enrichment, neutralization, and drying. EFFECT: it is provided simplification of technology and reduction of products self-cost. 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. What is Ammonium Nitrate 4. The nitrogen is heated to a temperature greater than or equal to the melting point of the zinc-calcium alloy. © 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. Powder is placed into reactor, which is filled with nitrogen to pressure 1 to 20 MPa. Furnace 4 may contain a device for supplying a regulated pressure to the molten alloy. This method, however, is not acceptable for large-scale production, as it takes about ten hours for nitriding each download of calcium. 127, pages 497-501). EFFECT: reduced power consumption and improved performance characteristics of cubic boron nitride. Its chemical formula is Ca 3 N 2. 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. 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. Calcium Ammonium Nitrate. It can be produced by direct reaction of the elements: 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. Using YaraLiva calcium nitrate fertilisers results in higher yields . 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. 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. Chem., 239, p. 273, 1938), gallium nitride, zinc (Zn3N2) cannot be formed by direct reaction of hot metal zinc on nitrogen. 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. can give calcium oxide, which, in turn, susceptible to trapping of liquid zinc. Finding molar mass starts with units of grams per mole (g/mol). The finished product results in a substance that looks similar to chunks of sea salt. 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. [ 1 ] α-Calcium nitride is the commonly encountered form. Nitrogen is a macro element, required by plants in large quantities. Obtaining the zinc-calcium alloy can be combined with the method to obtain calcium nitride, as shown in figure 3. 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 SUBSTANCE: the invention is pertaining to the method of the synthesis of calcium nitride. 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. 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. 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, 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. causing the increase in temperature which exceeds the melting point of calcium, approximately 839°C. Note that rounding errors may occur, so always check the results. 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. 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. 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. The corresponding costs of nitrogen and zinc-calcium alloy are respectively 5 l/min at a pressure of 4 bar (i.e. 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. It is hygroscopic and quickly dissolves in absorbed water from the air, and then can move into the soil/media. 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 zinc-calcium alloy contained in the first tank 19 contains, in mass proportions 1/3 of zinc and 2/3 of calcium. the according to the present invention the objective is achieved by virtue of the fact that Each mixture is heated to temperature not below 400°C at rate of heating of 120-140°C/h. Add your answer and earn points. The chamber is then evacuated and sealed. A common request on this site is to convert grams to moles. 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. Using the prefixes mono-, di-, tri- etc are important when 2 non-metals bond, … 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%. It reacts with hydrogen to make calcium hydride and calcium amide. Fine dark brown powder containing calcium nitride, is deposited at the bottom of the reactor 6. It is a red-brown solid. 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. shalhassan shalhassan Answer: Calcium is a reducing agent because it loses electrons and oxidises itself but reduces other reactants. Preparation. 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 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. 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). 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. 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. These relative weights computed from the chemical equation are sometimes called equation weights. Fertilizer grade CAN contains roughly 8% calcium and 21-27% nitrogen. 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%. It has various isomorphs forms, and α-calcium nitride is more commonly encountered. 5. 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. 2, pages 1514-1517, 1996). 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. Alcock (Bulletin of Alloy phase diagrams, 1990, Vol. During the initial phase of the method of synthesis it is necessary to avoid static contact between the zinc-calcium alloy and nitrogen. 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. 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, McHale et al., Chem. FIELD: production of super-hard materials, l-boron in particular. After that, add ammonia. Calcium nitride powder possesses the characteristics of high purity and uniform particle size distribution. the resulting calcium nitride is collected in a collector unit at the lower part of the reactor. The reason is that the molar mass of the substance affects the conversion. 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. They therefore decomposed by electrolysis to produce calcium on the cathode and nitrogen or oxygen at the anode. SUBSTANCE: invention relates to powder technology, particularly to receiving of materials, containing metal nitrides. 6. The cell 11 is formed by the anode 13, preferably made of graphite, and the cathode 14 formed a bath of molten zinc. common chemical compounds. SUBSTANCE: invention is directed to manufacturing very hard thermo- and chemically stable products. molar mass and molecular weight. Calcium nitride is a red-brown, crystalline solid made up of calcium and nitrogen. 1. 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. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. As a result the first container contains unneeded impurity substances, and the second contains solid gallium nitride. Both these are high-nitrogen fertilizers. Calcium nitrate contains both calcium and nitrogen, which are nutrients plants require to survive. CONTENTS. What is Calcium Ammonium Nitrate 3. The nitrogen is heated to a temperature greater than or equal to the melting point of the zinc-calcium alloy. Before the detonation the charge mixture can be encased in a shell made from the specified explosive. Calculate the molecular weight Calcium nitrate is a synthetic chemical mixture of two inorganic compounds—calcium and nitrogen. 40.078*3 + 14.0067*2. The reactor 6 is also equipped with a tool that provides heating and/or cooling of the vertical walls of the reactor 6. 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. 1 mole is equal to 1 moles Calcium Nitride, or 148.2474 grams. 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, EFFECT: the invention ensures simplification of the method of the synthesis of calcium nitride and the reduced cost. Asked by Wiki User. 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. 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. 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. 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. 8. 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. 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. Description of specific variants of embodiment of the invention. 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. He found that the compound obtained has a chemical composition of Ca3N2and density 2,63. 11. Sinters are mixed under conditions of premolding at grinding to size of particles lesser than 2 mm. 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. This change of the kinetics of the reaction corresponds allotropical conversion of calcium nitride, which passes from the quadratic structure in the cubic structure. 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. 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. This prevents local narisovanie calcium in the beginning of the method, which can lead to clogging of the nozzle. 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. The experiments conducted for 50 hours at 600°'t show no further reaction. The resulting very thin film, which corresponds to the increase in mass of less than 10 mg/cm3that is a very hundred is strong. He may be re-submitted in a container 2 containing molten zinc-calcium alloy to be used for new alloy. Difficulties arise as soon as trying to speed up the reaction by increasing the flow of nitrogen is provided in contact with the calcium. 3. What is Calcium … EFFECT: enhanced efficiency; possibility of producing flaw-free material possessing high strength. 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. It is made by burning calcium in nitrogen. Answer. 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. II, No. 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. 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. It exists in various forms (isomorphs), α-calcium nitride being more commonly encountered. 209 calcium nitrate products are offered for sale by suppliers on Alibaba.com, of which nitrate accounts for 20%, nitrogen fertilizer accounts for 15%. Resulting briquette is placed coaxially in shell in the form of two barrels superposed to each other through bottoms bent to 180 degree. The reaction products are collected in the lower part of the reactor 6 and possibly on the side walls of the reactor 6. 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. Browse the list of For example, the method of synthesis of calcium nitride is carried out in such a device, the device presented in figure 4. 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. Since the nitriding reaction is extremely exothermic, it gives a rapid increase in the wall temperature of the reactor 6, and may be the appearance of a flame having a length of about 10 cm and a diameter of a few millimeters. It is prepared mixture, containing chrome oxide (III) in amount 0.7-1.8 mol % and chrome powder - the rest. The SI base unit for amount of substance is the mole. To make it, combine nitric acid to any limestone. 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. FIELD: chemical industry; other industries; methods of the synthesis of calcium nitride. We first need to determine which between Ca and N 2 is the limiting reactant. Top Answer. 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 study of the kinetics of the nitriding reaction, however, was not allowed to develop industrial method of producing nitride calcium. 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. The zinc may de repeatedly used for production of the other alloy. The molecular formula for Calcium Nitride is Ca3N2. the Molten calcium is then covered with a nitride layer, which insulates it from the nitrogen, and the reaction stops almost completely. As soon as the supply of nitrogen is increased, the reaction is Oia is considerably accelerated, 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.