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Method for calcium nitride synthesis

一种合成工艺、氮化钙的技术，应用在氮化合物、氮-金属/硅/硼二元化合物、无机化学等方向，能够解决不适合大规模生产等问题

Inactive Publication Date: 2005-09-07
佛朗科伊斯·拉科斯特
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  • Abstract
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Problems solved by technology

However, this process is not suitable for large-scale production because it takes 10 hours per batch of calcium to nitride

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  • Method for calcium nitride synthesis
  • Method for calcium nitride synthesis
  • Method for calcium nitride synthesis

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Embodiment Construction

[0018] According to the present invention, the synthesis of calcium nitride is accomplished by reacting nitrogen with molten zinc-calcium alloy in one reactor. The nitrogen is first heated to a temperature above or equal to the melting point of the zinc-calcium alloy.

[0019] The use of zinc-calcium alloys as calcium raw materials in the nitriding process is of particular interest because, as taught by R.Juza et al. (Z.Anorg.Chem., 239 p273, 1938), zinc nitride (Ca 3 N 2 ) cannot be formed by the direct reaction of hot metallic zinc on nitrogen. And, as in figure 1 As shown in the figure of , zinc-calcium alloys with higher calcium content have a much lower melting point than pure calcium. The zinc-calcium alloy preferably has an atomic calcium content of greater than or equal to 50%, more particularly between 50% and 80% atomic calcium.

[0020] In a specific example, such as figure 2 As shown, an apparatus 1 capable of performing the synthesis of calcium nitride comp...

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Abstract

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. The resulting calcium nitride is collected in a collector unit (7) at the lower part of the reactor (6). The zinc contained in the droplets is evaporated and condensed on the cooled walls of the reactor (6) and can be reused for preparing another alloy. The zinc-calcium alloy is obtained by electrolysis of calcium chloride in an electrolytic cell (11) whereof the cathode (14) is a solution containing molten zinc.

Description

technical field [0001] The invention relates to a calcium nitride synthesis process according to which nitrogen and calcium sources are reacted in a reactor. Background technique [0002] The synthesis of calcium nitride by heating pure calcium in the presence of nitrogen is known since the work of Henri de Moissan (Comptes Rendus a l'Academie des Sciences, 1898, Vol. 127, pages 497 to 503). He determined the chemical composition of the resulting compound to be Ca 3 N 2 , and its density was determined to be 2.63. V.Pitkin and C.B Alcock (Bulltin of alloy phasediagrams, 1990, Vol II N°5, pages 497 to 501) give the melting point of calcium nitride to be close to 1450°C and determine that it decomposes only at a temperature of about 1600°C . [0003] In studying the kinetics of the nitrogenation reaction of bulk calcium, J.Aubry and R. Streiff (Repports a l'Academie des Sciences, 1966, Vol.263, pages 931 to 934) pointed out that the reaction between high-purity calcium ob...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06
CPCC01B21/0612
Inventor 佛朗科伊斯·拉科斯特
Owner 佛朗科伊斯·拉科斯特
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