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Preparation method of high-purity tellurium dioxide powder

A tellurium dioxide and powder technology, which is applied in the field of high-purity tellurium dioxide powder preparation technology, can solve the problems of waste of chemical reagent raw materials, environmental pollution, complicated steps, etc., and achieves simple and convenient equipment, less chemical reagents, The effect of simplifying the production process

Inactive Publication Date: 2014-05-21
张家港绿能新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of complex steps in the current production process of tellurium dioxide, high energy consumption, waste of raw materials for chemical reagents, and pollution to the environment, the invention discloses a method for preparing high-purity tellurium dioxide powder, which is characterized in that: Specifically include the following steps:

Method used

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Examples

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specific Embodiment 1

[0028] In a 500-liter titanium reactor, add 350L of 68% industrial nitric acid, heat the reactor to a temperature of 70°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 acid insoluble matter is 0.05%, the mass fraction of selenium is 0.05%, and the sum of other impurities is 0.05%. Aspirate the liquid, wash the precipitate with 100L deionized water, adjust the pH value to 6, stop washing, place the material on the calcining tray, keep the furnace temperature at 200°C, and keep the temperature constant for 3 hours. After the water is dried, calcinate at 650°C for 2 hours. , put the calcined tellurium dioxide into a pulverizer, and sieve it with a 200-mesh stainless steel vibrating sieve after pulverization. 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 ≥ 99.96%), uniform crystal size and hig...

specific Embodiment 2

[0029] In a 500-liter titanium reactor, add 300L of 65% industrial nitric acid, heat the reactor to a temperature of 65°C, and put 80kg of raw tellurium powder into the ground at a rate of 90g / 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%. Discharge with a catheter, wash the precipitate with 80L of deionized water, adjust the pH value to 7, stop washing, place the material on a calcining tray, keep the furnace temperature at 200°C, and keep the temperature constant for 2 hours. After drying the water, calcinate at 650°C for 1.5 hours, put the calcined tellurium dioxide into a pulverizer, and sieve it with a 200-mesh stainless steel vibrating sieve after pulverization. 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 ≥ 99.96%), uniform crystal ...

specific Embodiment 3

[0030] In a 500-liter titanium reactor, add 400L of 66% industrial nitric acid, heat the reactor to a temperature of 60°C, and put 150kg of raw tellurium powder into the ground at 120g / min. The particle size of the raw tellurium powder is 100μm. The mass fraction of acid insoluble matter is 0, the mass fraction of selenium is 0.01%, and the sum of other impurities is 0.01%. Wash the precipitate with 100L of deionized water, adjust the pH value to 6.5, stop washing, place the material on a calcining tray, keep the furnace temperature at 200°C, and keep the temperature constant for 2.5 hours. Put the calcined tellurium dioxide into a pulverizer, and sieve it with a 200-mesh stainless steel vibrating sieve after pulverization. The obtained high-purity tellurium dioxide powder has a particle size of about 75-150 μm (100-200 mesh), a purity of 4N (Te mass fraction ≥ 99.99%), uniform crystal size and high purity.

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Abstract

The invention provides a preparation method of high-purity tellurium dioxide powder. The preparation method comprises the following steps: grinding a raw material tellurium powder, oxidizing the tellurium powder with concentrated nitric acid under a heating condition, cleaning the precipitate with deionized water and adjusting the pH value, and calcining after high-temperature dehydration to obtain the high-purity tellurium dioxide, next, putting the thoroughly calcined material in a pulverizer for pulverizing, and finally, sieving the powder with a 200-mesh stainless steel vibrating screen to obtain the high-purity tellurium dioxide powder having the grain size ranging from 75 to 150 microns. The preparation method is reduced in tellurium dioxide preparation steps and used chemical reagents, lowered in energy consumption and improved in efficiency; the preparation method is simplified in process flow, simple in equipment, and beneficial to industrial production and environmental conservation.

Description

technical field [0001] The invention relates to a method innovation for the preparation process of high-purity tellurium dioxide powder. Background technique [0002] Tellurium dioxide is an important rare chemical raw material. The current industrial preparation methods of tellurium dioxide all have the disadvantages of complex process steps, high energy consumption, wasteful use of chemical reagent raw materials, many by-products, and environmental pollution. Chinese Patent Application No. 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 Complicated, and many reagents are used, which is inconvenient for industrial production and not conducive to environmental protection. [0003] Chinese patent application number 201310264501.6 intr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
Inventor 梁文正
Owner 张家港绿能新材料科技有限公司
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