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A processing technology and high-strength technology, applied in the field of tin powder processing, can solve problems affecting the strength of tin powder and achieve the effect of reducing purity
Active Publication Date: 2022-01-14
广东斯特纳新材料有限公司
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[0003] However, since the ammonium chloride powder has not been removed during the tin making process, this leads to the thermal decomposition of ammonium chloride into ammonia and hydrogen chloride when the tin element is produced in the later stage, and heating is required when tin hydroxide is reduced, ammonia gas It reacts reversibly with hydrogen chloride in a heated state, and then forms ammonium chloride crystals. Since hydrogen gas is introduced into the container, tin elemental substance and ammonium chloride exist at the same time in the place where tin elemental substance is produced, which will lead to the production of tin elemental substance in the later stage. When tin powder is used, it is easy to mix ammonium chloride, which will affect the strength of tin powder
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Embodiment 1
[0025] see figure 1 , the present invention provides a kind of technical scheme: a kind of processing technology of high-strength tin powder, described processing technology step is as follows:
[0026] The first step: gasification purification, prepare an appropriate amount of tin tetrafluoride raw material, put the tin tetrafluoride in the container and heat it to 705°C, and heat it for an appropriate amount of time, until the tin tetrafluoride is completely vaporized;
[0027] Tin tetrafluoride sublimates at 705°C.
[0028] The second step: condensation collection, collecting the vaporized tin tetrafluoride in a container, and cooling the vaporized tin tetrafluoride to liquid or solid state;
[0029] When collecting tin tetrafluoride, it is necessary to keep the environment dry to prevent tin tetrafluoride from dissolving in water.
[0030] The third step: hydration, heating the purified tin tetrafluoride to 705°C again, after the tin tetrafluoride is completely vaporized...
Embodiment 2
[0055] see figure 1 , the present invention provides a kind of technical scheme: a kind of processing technology of high-strength tin powder, described processing technology step is as follows:
[0056]The first step: gasification purification, prepare an appropriate amount of tin tetrafluoride raw material, put the tin tetrafluoride in the container and heat it to 705°C, and heat it for an appropriate amount of time, until the tin tetrafluoride is completely vaporized;
[0057] Tin tetrafluoride sublimates at 705°C.
[0058] The second step: condensation collection, collecting the vaporized tin tetrafluoride in a container, and cooling the vaporized tin tetrafluoride to liquid or solid state;
[0059] When collecting tin tetrafluoride, it is necessary to keep the environment dry to prevent tin tetrafluoride from dissolving in water.
[0060] The third step: hydration, heating the purified tin tetrafluoride to 705°C again, after the tin tetrafluoride is completely vaporized,...
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Abstract
The invention relates to the technical field of tin powder processing, and particularly relates to a processing technology of high-strength tin powder. The processing technology comprises the steps that 1, gasification purification is conducted, specifically, a proper amount of tin tetrafluoride raw materials are prepared, tin tetrafluoride is placed in a container and heated to 705 DEG C, and heating is conducted for a proper time till tin tetrafluoride is completely vaporized; and 2, condensation collection is conducted, specifically, vaporized tin tetrafluoride is collected in the container and cooled to be in a liquid state or a solid state. According to the processing technology, in the process of manufacturing a tin elementary substance, through secondary purification, ammonium chloride generated in the hydration step can be effectively decomposed into ammonia gas and hydrogen chloride gas, the ammonia gas and the hydrogen chloride gas are pumped away through the vacuumizing effect, the situation that the ammonia gas and the hydrogen chloride gas participate in a reaction in the later manufacturing process, other substances except tin are generated, and consequently the purity of the tin powder is reduced, and the strength of the tin powder is affected is prevented.
Description
technical field [0001] The invention relates to the technical field of tin powder processing, in particular to a processing technology of high-strength tin powder. Background technique [0002] Tin powder is gray-green powder with a melting point of 231.88°C. The boiling point is 2270°C. The relative density is 7.28. Soluble in concentrated hydrochloric acid, sulfuric acid, aqua regia, concentrated nitric acid, hot caustic solution, slowly soluble in cold dilute hydrochloric acid, dilute nitric acid, hot dilute sulfuric acid, cold caustic solution, soluble in acetic acid more slowly. It is stable in air, but tin powder is easy to oxidize, especially in humid air. The material used in the electronics industry is used as a high-purity reagent. The existing process for preparing tin powder is usually: use tin tetrachloride as raw material, after distillation and purification, hydrolyze it into tin hydroxide, and then pass it into hydrogen for reduction to obtain High-purity...
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