The latter is transferred via a feed pipe 3 to a furnace 4 in which it is heated to and/or kept at a preset, temperature, greater than or equal to its melting temperature. Share Tweet Send Calcium carbide lights [Flickr] Car­bides are formed in the in­ter­ac­tion of car­bon with met­als, at high tem­per­a­tures. 3. Compounds in this group are nominally salts of the following anions: [N]3-, [P]3-, [NH2]-, [C]2-, and [Si]4-. 4H 2 O . Properties of calcium nitrate: White, decomposes upon melting. In combination, these nutrients fuel prolonged growth. These means are preferably means for injecting an inert gas such as argon. Vaporization of the zinc, during nitriding of the calcium, and subsequent condensation thereof on the walls of the reactor, also facilitate the heat transfer to the outside of the reactor and therefore enable the production flow to be increased without excessive overheating of the reactor. 2.63g/cm3 density (17 ° C). The liquid zinc is collected into the bottom of the reactor 6 and is extracted via a drainage valve 9. Molecular Weight 236.15 . Different analyses can be carried out to determine the composition of the fine powder and in particular the calcium nitride contamination elements. After the reaction has started, the heating is cut off and replaced by cooling which reduces the temperature of the reactor walls to a temperature close to 500° C. so as to remove the heat given off when the nitriding reaction takes place. 2. calcium nitride Molecular formula : Ca 3 N 2 CAS : nature : brown crystals. The metal reacts with oxygen at room temp., and forming a thin layer of CaO, which protect the metal from further oxidation. V. P. Itkin and C. B Alcock (Bulletin of alloy phase diagrams, 1990, Vol II No. Chemical Reactions of Calcium. Compounds 1 and 2 both crystallize in the monoclinic space group P21/n but show significant differences in their lattice parameters: 1, a = 9.2516(6) Å, b = 13.4298(9) Å, … Acid soluble in anhydrous alcohol decomposition. PubChem Substance ID 24865975. It is a red-brown solid. [1] α-Calcium nitride is the commonly encountered form.It has an anti-bixbyite structure similar to Mn 2 O 3, except that the positions of the ions are reversed: calcium (Ca 2+) take the oxide (O 2−) positions and nitride ions (N 3−) the manganese (Mn 3+). The height of the reactor 6 is sufficiently great for a significant fraction of calcium contained in the droplets to be nitrided during the fall of the droplets. MDL number MFCD00015985. It contains calcium and nitride ions. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. 4, a device 1 enabling calcium nitride synthesis to be performed comprises a first tank 16 equipped with heating means 17 designed to keep the zinc-calcium alloy 18 molten in the first tank 16. Experiments carried out for 50 hours at 600° C. did not show any resumption of the reaction. Thus, the three-way valve 27 is respectively connected to the second and third tanks 19 and 25 by second and third pipes 28 and 29. Calcium nitride is a red-brown, crystalline solid made up of calcium and nitrogen.Its chemical formula is Ca 3 N 2. 1. Ca(NO3)2 - CALCIUM NITRATE. They will therefore decompose by electrolysis producing calcium at the cathode and nitrogen or oxygen at the anode. The third pipe 29 is equipped with a third pressure-reducing valve 30 and the inlet pipe 26 of the furnace 24 comprises a flowmeter 31 arranged near the three-way valve 27 and a heating sleeve 32 arranged between the flowmeter 31 and furnace 24. 4. Each nitride is surrounded by six calcium, and each calcium by four nitride ions. Thus, it is possible to perform: For example, a calcium nitride synthesis process was performed in a device such as that represented in FIG. The zinc-calcium alloy 18 contained in the tank 16 is preferably chosen so as to have the lowest possible melting temperature. 50 g/mn of calcium contained in the alloy). Ion - type compounds. The electrolytic cell 11 is formed by an anode 13, preferably made of graphite, and a cathode 14 formed by a molten zinc bath. about 26 g/mn of nitrogen) and 75 g/mn (i.e. NACRES NA.23 an X-ray diffraction spectrum of a sample suitably protected from air so as to determine possible contaminations of the calcium nitride. Linear Formula Ca 3 N 2. A part of the calcium nitride powder produced in the reactor could in fact be trapped by the zinc condensed along the walls. As the nitriding reaction is extremely exothermal, it results in a fast temperature rise of the walls of the reactor 6 and can be visualized by the appearance of a flame having a length of about 10 cm and a diameter of a few millimeters. The sprayer 5 can be of any type. The object of the invention is to achieve a calcium nitride synthesis process able to produce calcium nitride quickly, in large quantity and with economical raw materials. Display Name: Calcium nitrate EC Number: 233-332-1 EC Name: Calcium nitrate CAS Number: 10124-37-5 Molecular formula: Ca(NO3)2 IUPAC Name: calcium dinitrate 3Ba(NH2)2 → Ba3N2 + 4NH3 Nitrides are also formed during surface hardening of steel Properties. These compounds have high melting points. The reactor 6 is also equipped with means enabling the vertical walls of the reactor 6 to be heated and/or cooled. P.-C. Aïtcin, in Science and Technology of Concrete Admixtures, 2016. Thus, as represented in FIG. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with alkaline-earth metals, beryllium or magnesium, 烟台同立高科新材料股份有限公司, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362. In another embodiment, the zinc-calcium alloy can be sprayed in the form of fine droplets propelled by a jet of pressurized nitrogen heated to a temperature close to that of the molten and sprayed zinc-calcium alloy. Wells, A.F. Chem., 239 p273, 1938), zinc nitride (Zn3N2) cannot form by direct reaction of hot metallic zinc on nitrogen. Free format text: It was discovered by British chemist Sir Humphry Davy in 1808 by the hydrolysis reaction, in which lime (CaO) and mercury oxide (HgO) were the reactants, and metallic calcium was isolated as the final product. The resulting calcium nitride is collected in a collector unit at the lower part of the reactor. The zinc-calcium alloy, propelled by a jet of pressurized nitrogen or argon preheated to a temperature greater than or equal to the melting temperature of the zinc-calcium alloy, is thus injected into a sprayer 33 so as to form fine droplets 34 in a reactor 6 containing nitrogen. Homework Helper. It can be produced by direct reaction of the elements: 3 Ca + N 2 → Ca 3 N 2. Properties. The zinc recycled to the electrolytic cell is liable to be contaminated by calcium nitride or calcium oxide (CaO). 12149. Any contamination by calcium nitride or calcium oxide will be eliminated when electrolysis takes place. This study of the nitriding reaction kinetics did not however enable an industrial calcium nitride fabrication process to be developed. The reaction products are collected at the bottom part of the reactor 6 and possibly on the side walls of the reactor 6. Calcium nitrate definition is - a colorless crystalline deliquescent salt Ca(NO3)2 occurring often in natural waters and soil and as the mineral nitrocalcite, made by reaction of nitric acid or nitrogen oxides with lime or calcium carbonate, and used as a fertilizer. MDL number MFCD00149604. 2) arranged in the lower part of the reactor collects the droplets at the end of their fall and is maintained at a temperature of at least 650° C. so that the nitriding reaction can continue at the level of the collector unit. The zinc collected at the bottom of the reactor 6 can then be re-injected into the molten zinc bath constituting the cathode 14 via the drainage valve 9 and an outlet pipe 15 to be re-used for preparation of a new alloy. The mass ratio between the nitrogen and calcium respectively injected into the reactor is therefore about 0.5 whereas the mass ratio necessary for complete nitriding of the calcium is 0.23. In the acidic solution is recovered only by atomic hydrogen. The zinc contained in the zinc-calcium alloy thus vaporizes in the course of the reaction and then condenses on the upper parts of the reactor walls. The nitrogen is previously heated to a temperature greater than or equal to the melting temperature of the zinc-calcium alloy. Transition metal nitrides form compounds with the formula MN, M 2 N, and M 4 N. The largest group of nitrides is the interstitial nitrides. The furnace 4 can comprise means designed to apply an adjustable pressure to the molten alloy. PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362. Its chemical formula is Ca 3 N 2. α-Calcium nitride adopts an anti-bixbyite structure, similar to Mn 2 O 3, except that the positions of the ions are reversed: calcium (Ca 2+) take the oxide (O 2−) positions and nitride ions (N 3−) the manganese (Mn 3+). For example, the zinc-calcium alloy is an alloy containing a mass proportion of one third zinc for two thirds calcium, the melting temperature of such an alloy being about 420° C. The alloy is moreover pressurized by argon coming from a second tank 19 by means of first and second pressure-reducing valves 20 and 21. The zinc-calcium alloy thus obtained is then transferred to the furnace 4 via the feed pipe 3, and is input and treated in the reactor 6 according to FIG. Others replaced the pure calcium, industrially not economical, by calcium obtained industrially in the form of turnings, and observed that the nitriding reaction did not begin below 600° C. and that the temperature had to be increased to over 650° C. and even preferably to 700° C. to have a significant reaction kinetics. Calcium nitrate can be hydrolyzed to give nitric acid, which can react with this hydroxide. A sprayer for example such as the sprayer described in the Patent EP-B1-0268627 is used, which patent relates to a process and device for granulating a molten material, in particular calcium and magnesium. Synthesis, structure, and properties of calcium zinc nitride (Ca2ZnN2). FIG. The resulting calcium nitride is collected in a collector unit at the lower part of the reactor. nitrides; Compounds of nitrogen with more than one metal, silicon or boron, Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. Product Id 748400. 24.3.3.1 Calcium nitrite. During the starting phase of the synthesis process, it is in fact necessary to avoid a static contact between the zinc-calcium alloy and the nitrogen. 24.3.3.1 Calcium nitrite. During the nitriding reaction, which is very exothermal, the zinc contained in the sprayed droplets is vaporized by the heat released during the nitriding reaction of calcium and condenses on the cooled walls of the reactor 6 in the form of drops 8 of liquid zinc, represented by a broken line in FIG. Difficulties arise as soon as it is sought to speed up the reaction by increasing the flow of nitrogen in contact with the calcium. 1, calcium-rich zinc-calcium alloys have a melting temperature much lower than that of pure calcium. This change in the reaction kinetics corresponds to the allotropic transformation of the calcium nitride which goes from a quadratic structure to a cubic structure. The nitrogen pressure inside the reactor is preferably controlled by a valve 36 arranged on one of the side walls of the reactor 6 and the device 1 can comprise a nitrogen collection and recirculation system (not shown). The respective nitrogen and zinc-calcium alloy flowrates are respectively 51/mn at a pressure of 4 bars (i.e. The zinc-calcium alloy is then sprayed in the form of droplets by means of a sprayer 5 arranged at the interface of the furnace 4 and of the top of a reactor 6. 263, pages 931 to 934) indicated that the reaction between high purity calcium obtained by bisublimation and dry nitrogen begins at 200° C., but that the weight increase remains small up to about 500° C. The calcium is in fact covered right from the beginning of the experiment with a compact, very adherent layer of dark blue nitride with a metallic lustre, considerably slowing down the reaction speed. The use of the zinc-calcium alloy as calcium source in the nitriding process is particularly interesting because, as taught by R. Juza et al. Participates in exchange reactions. The respective flowrates of the zinc-calcium alloy and nitrogen, when inlet to the furnace 24, are adjusted so that the quantity of nitrogen inlet to the furnace is greater than or equal to that required to ensure complete nitriding of the calcium contained in the zinc-calcium alloy. Calcium nitride is formed along with the oxide, CaO, when calcium burns in air. The resulting calcium nitride is collected in a collector unit (7) at the lower part of the reactor (6). It can be produced by direct reaction of the elements: He determined that the chemical composition of the compound obtained is Ca3N2 and that its density is 2.63. The oxidation number of calcium in tricalcium dinitride is 2.. Synthesis. 2. Calcium word is derived from the Latin word ‘calx’, which means lime. A first siphoning pipe 22 protected by a heating sleeve 23 enables the molten zinc-calcium alloy to be transferred from the tank 16 to a furnace 24. The zinc-calcium alloy can be obtained by melting a mixture of powders or turnings of zinc and calcium. The invention concerns a method for calcium nitride synthesis which consists in spraying in form of droplets, by means of a sprayer (5), a molten zinc-calcium alloy into a reactor (6) containing nitrogen at high temperature. α-Calcium nitride adopts an anti-bixbyite structure, similar to Mn 2 O 3, except that the positions of the ions are reversed: calcium (Ca 2+) take the oxide (O 2−) positions and nitride ions (N 3−) the manganese (Mn 3+).In this structure, Ca 2+ occupies tetrahedral sites, and the nitride centres occupy two different types of octahedral sites.. Synthesis and reactions By operating by injection of successive puffs of nitrogen between which the calcium is allowed to cool down to about 650° C., complete nitriding of the calcium can be achieved. Above 650° C., the reaction resumes, the nitrogen diffusing in molecular state to the calcium-nitride interface, the seat of the reaction. In a particular embodiment, as represented in FIG. Production of the zinc-calcium alloy can be integrated in the calcium nitride fabrication process, as represented in FIG. (Z. Anorg. However, when all the calcium nitrite added during the mixing has been transformed into calcium nitrate, oxygen ions resume their attack on the reinforcing steel. It can also be equipped with a system for measuring the calcium content, and be able to adjust this content by adding calcium or zinc, depending on the case, to obtain the required zinc-calcium alloy. The temperatures of the zinc-calcium alloy and of the nitrogen are preferably greater than 700° C., at the inlet of the sprayer 33, before the zinc-calcium alloy is sprayed into the reactor under the action of the argon jet. The zinc-calcium alloy is obtained by electrolysis of calcium chloride in an electrolytic cell whereof the cathode is a solution containing molten zinc. A fine, pulverulent, dark brown-coloured powder containing calcium nitride deposits at the bottom of the reactor 6. The zinc-calcium alloy contained in the first tank 19 comprises, in mass proportion, ⅓ zinc and ⅔ calcium. The calcium contained in the droplets then reacts with the nitrogen in the reactor 6 to form calcium nitride. weight loss measurement after heating in a vacuum performed at a temperature of about 1100° C. so as to know the proportion of matter sublimated at this temperature, the expected sublimated matter being zinc and a fraction of non nitrided or non oxidized calcium. PubChem Substance ID 329752445. This buffer tank can be supplied alternately by several sources of calcium and zinc. Calcium nitride is the inorganic compound with the chemical formula Ca3N2. The furnace 24 is designed to receive nitrogen coming from a third tank 25 but also argon coming from the second tank 19. If the calcium nitride is contaminated by a zinc residue, the zinc can be easily eliminated by vacuum distillation, for example, taking advantage of the large difference between the boiling temperature of zinc which is 907° C. and the melting temperature of calcium nitride which is 1450° C. The calcium nitride can also be contaminated by a mixed nitride Ca2ZnN2 which can be produced around 650° C., by reaction of Ca3N2 with zinc in the presence of nitrogen. In particular, the calcium chloride electrolysis can be improved by adding different fluxing agents, and it can also be replaced by calcium oxide electrolysis. EC Number 234-592-9. These compounds undergo hydrolysis to produce ammonia and the metal hydroxide. The sprayer is preferably a sprayer 33 such as those marketed by Enami Spraying Systems. For large volume production, it is preferably obtained by electrolysis of a calcium chloride or a calcium oxide in an electrolytic bath with a cathode made of molten zinc. Calcium nitride synthesis process according to which nitrogen is made to react with a calcium source in a reactor, process wherein the calcium source is a molten zinc-calcium alloy and the nitrogen is previously heated to a temperature greater than or equal to the melting temperature of the zinc-calcium alloy. Feb 23, 2005 #3 GCT. I believe Chemtr is right in saying that solid calcium hydroxide is one of the products. chemical analysis to determine the proportion of zinc with respect to the total calcium contained in the powder. The invention concerns 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. YaraLiva Calcium Nitrates provide the preferred form of nitrogen - nitrate-N, mobile in the soil and immediately available to crops. The invention concerns 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. The very thin film thus formed which corresponds to a weight gain of less than 10 mg/cm3 is very stable. The first tank 19 is heated to a temperature of about 450° C. so as to maintain the zinc-calcium alloy above its melting temperature which is about 420° C. For argon, the first and second pressure-reducing valves 20 and 21 are respectively set to absolute pressures of 4 bars and 1.5 bars whereas for nitrogen, the third pressure-reducing valve 30 is set to an absolute pressure of 4 bars. Likewise the presence of a little oxygen in the reactor, notably following a slight contamination of the industrial nitrogen used, can produce calcium oxide, which is in turn liable to be trapped by the liquid zinc. According to the invention, calcium nitride synthesis is performed by making nitrogen react with a molten zinc-calcium alloy in a reactor. 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EC Number 233-332-1. 2 represents in schematic form a first embodiment of a device enabling a synthesis process according to the invention to be implemented. The fact that the atomic calcium content of the zinc-calcium alloy for correct operation of the reaction is high may require a buffer tank to be fitted between the place where the zinc-calcium alloy is produced and the reactor. J.2, pages 1514 to 1517, 1996). In addition, YaraLiva products are formulated with strength-building, water-soluble calcium. Furthermore, they have respective decomposition voltages (0.40V for Ca3N2 and 2.75V for CaO) which are lower than that of CaCl2 (3.30V). You need to distinguish calcium metal [itex]Ca_{(s)}[/itex] from its cationic form. 2, a device 1 enabling calcium nitride synthesis to be performed comprises a tank 2 containing the molten zinc calcium alloy. It can be reinjected into the tank 2 containing the molten zinc-calcium alloy to be used for preparation of a new alloy. The zinc-calcium alloy and nitrogen are respectively heated in the first and third pipes 22 and 29 so that they both enter the furnace 24 at high temperature before being sprayed by the sprayer 33. Calcium nitride is available from the direct reaction of calcium metal with nitrogen gas. 3 represents in schematic form a second embodiment of a device enabling a synthesis process according to the invention to be implemented. 4 represents in schematic form a third embodiment of a device enabling a synthesis process according to the invention to be implemented. 3Ca + N2 → Ca3N2 A second method is through the loss of ammonia by thermal decomposition of a metal amide, shown here with barium amide. Thus, during the starting phase of spraying of the zinc-calcium alloy, it is preferable to spray the latter by means of an argon jet before replacing the argon jet by a nitrogen jet. [1] It exists in various forms (isomorphs), α-calcium nitride being more commonly encountered. One of the major advantages of using a zinc-calcium alloy is that it has a much lower melting temperature than that of pure calcium, which fosters spraying of the droplets and which thus enables a higher reaction yield to be obtained by increasing the contact surface between the calcium and nitrogen. Ionic nitrides. 5, pages 497 to 503) showed that the melting point of calcium nitride is close to 1450° C. and that it only decomposes around 1600° C. When studying the kinetics of the nitriding reaction of bulk calcium, J. Aubry and R. Streiff (Rapports à I'Académie des Sciences, 1966, Vol. Other advantages and features will become more clearly apparent from the following description of particular embodiments of the invention given as non-restrictive examples only and represented in the accompanying drawings, in which: FIG. Calcium carbide, also known as calcium acetylide, is a chemical compound with the chemical formula of Ca C 2.Its main use industrially is in the production of acetylene and calcium cyanamide.. Moreover, as indicated in the diagram of FIG. With water hydrolysis occurred generation calcium hydroxide and release ammonia. The equation of calcium nitrate and water can be written as Ca(NO2)2 + H2O --->Ca(NO3)2.4H2O. Like sodium oxide, calcium nitride absorbs hydrogen above 350 °C: Unit cell containing 31 nitride ions (red) and 48 calcium ions (white). 127, pages 497 to 501). FIG. Hydrolysis studies on bismuth nitrate: synthesis and crystallization of four novel polynuclear basic bismuth nitrates. Once the zinc-calcium alloy has been sprayed in the form of fine droplets, the droplets react immediately with the hot nitrogen which propels them. Buy high quality Calcium Nitride by Hebei Ledphor Optoelectronics Technology Co.,Ltd.. Calcium nitride is formed along with the oxide, CaO, when calcium burns in air. Except where otherwise noted, data are given for materials in their. This prevents local nitriding of the calcium, at the beginning of the process, which could lead to clogging of the sprayer. When the reaction begins, the heating increases the temperature of the nitrogen to a temperature close to the initial temperature of the droplets sprayed into the reactor 6. The metal once ignited, it burn in air, and forms a mixture of white calcium oxide (CaO) & calcium nitride (Ca 3 N 2): 2 Ca (s) + O 2 → 2 CaO (s) 3 Ca (s) + N 2 (g) → Ca 3 N 2 (s). Other articles where Calcium nitride is discussed: nitride: Preparation of nitrides: …here for the synthesis of calcium nitride, Ca3N2. According to one feature of the invention, the zinc contained in the zinc-calcium alloy is vaporized by the heat released during the nitriding reaction of calcium, condenses on cooled walls of the reactor and is collected at the bottom of the reactor. According to another development of the invention, the zinc-calcium alloy is sprayed in the form of fine droplets, propelled by a jet of pressurized nitrogen heated to a temperature close to that of the sprayed zinc-calcium alloy, the flowrate of the nitrogen jet being preferably greater than or equal to the quantity required to completely nitride the calcium contained in the sprayed zinc-calcium alloy. Essential boron- Alongside calcium, boron improves the cellular integrity of plants and produce. This contamination can, however, easily be eliminated by heating above 700° C., the mixed nitride Ca2ZnN2 in fact being known to decompose above 700° C. (J. M. McHale et al., Chem. 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