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Preparation method of high-purity tellurium dioxide powder

A tellurium dioxide and high-purity technology is applied in the field of preparing high-purity tellurium dioxide powder, which can solve the problems of many by-products, unfavorable environmental protection, complicated processes, etc. The effect of improving the contact area

Inactive Publication Date: 2017-01-25
乐山凯亚达光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Existing tellurium dioxide is an important rare chemical raw material. The current industrial preparation methods of tellurium dioxide all have complex process steps, high energy consumption, wasteful use of chemical reagent raw materials, many by-products, and pollution to the environment. shortcoming
Chinese patent application 201210412763.8 introduces the purification method of tellurium dioxide, including alkali leaching, neutralization, water washing, drying and other steps, and also needs to add impurity remover in the process of alkali leaching and alkali leaching filtrate neutralization, not only the process is complicated , and more reagents are used, which is inconvenient for industrial production and not conducive to environmental protection

Method used

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Examples

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Effect test

specific Embodiment 1

[0019] In a 500L titanium reactor, add 350L of 66% industrial nitric acid, heat it to the temperature of the reactor at 55°C, and put 100kg of raw tellurium powder into the ground at 150g / min. The particle size of the raw tellurium powder is 150μm. The mass fraction of insoluble matter is 0.05%, the mass fraction of selenium is 0.05%, and the sum of other impurities is 0.05%. After accelerated precipitation with 28% ammonia solution, siphon the supernatant and wash the precipitate with 100L of deionized water. The pH value of the washing solution is 7, stop washing, and place the material on the calcining tray. The furnace temperature is 200°C. Keep the temperature at a constant temperature for 2 hours. After the water is dried, calcinate at a constant temperature of 600°C for 3 hours. Put the calcined tellurium dioxide into a pulverizer. The obtained high-purity tellurium dioxide powder has a particle size of about 75-150 μm (100-200 mesh), a purity of 3N (Te mass fraction ≥ ...

specific Embodiment 2

[0021] In a 500-liter titanium reactor, add 300L of 67% industrial nitric acid, heat the reactor to a temperature of 65°C, and put 80kg of raw tellurium powder into the ground at 120g / min. The particle size of the raw tellurium powder is 150μm. The mass fraction of acid insoluble matter is 0.02%, the mass fraction of selenium is 0.03%, and the sum of other impurities is 0.04%. After accelerated precipitation for 28% ammonia solution, discharge the supernatant with a catheter, wash the precipitate with 80L of deionized water, adjust the pH value to 7, stop washing, and place the material on a calcining tray with a furnace temperature of 200°C and a constant temperature After 3 hours, after drying the water, calcined at a constant temperature of 650°C for 3.5 hours, put the calcined tellurium dioxide into a pulverizer, and sieved it with a 200-mesh stainless steel vibrating sieve after pulverization. The obtained high-purity tellurium dioxide powder has a particle size of about ...

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Abstract

The invention discloses a preparation method of high-purity tellurium dioxide powder. The method comprises the following steps: carrying out fine grinding on the raw material tellurium powder until the particle size is less than or equal to 150 mu m; nitric acid oxidization: adding 66-67% concentrated nitric acid into a reaction kettle, heating to 55-65 DEG C, adding the tellurium powder in the step (1), and stirring at the constant temperature of 70-80 DEG C for 2-3 hours until the reaction is complete; pH value regulation: after the temperature drops to at most 50 DEG C, adding aqua ammonia to accelerate precipitation, separating the supernate and the material precipitate, and washing the material with deionized water until the pH value of the washing solution is 7; and dewatering and calcination: drying for 2-3 hours while controlling the material temperature at 200 DEG C, and calcining for 3-3.5 hours while controlling the material temperature at 600-650 DEG C, thereby obtaining the high-purity tellurium dioxide powder. By performing the grinding and screening, the method solves the problems of complex steps, high consumption of chemical reagents, high energy consumption and lower efficiency in the prior art.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of high-purity tellurium dioxide powder. Background technique [0002] Existing tellurium dioxide is an important rare chemical raw material. The current industrial preparation methods of tellurium dioxide all have complex process steps, high energy consumption, wasteful use of chemical reagent raw materials, many by-products, and pollution to the environment. shortcoming. Chinese patent application 201210412763.8 introduces the purification method of tellurium dioxide, including alkali leaching, neutralization, water washing, drying and other steps, and also needs to add impurity remover in the process of alkali leaching and alkali leaching filtrate neutralization, not only the process is complicated , and many reagents are used, which is not convenient for industrial production, and is also not conducive to environmental protection. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
CPCB65D49/00B65D85/72C01B19/004C01P2004/60C01P2004/61C01P2006/80
Inventor 郭春雨陈俊陈云博于平于清炎干大强
Owner 乐山凯亚达光电科技有限公司
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