Preparation method and application of ultrathin 4N tellurium dioxide powder

A technology of tellurium dioxide and powder, which is applied in the field of tellurium dioxide preparation, can solve the problems of complex production process steps of tellurium dioxide, high energy consumption, waste of chemical reagent raw materials, etc., achieve low equipment requirements and improve quality , evenly distributed effect

Inactive Publication Date: 2017-03-29
四川中蓝基业新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method and application of ultra-fine 4N tellurium dioxide powder in view of the deficiencies of the prior art, which is characterized in that the current production process steps of tellurium dioxide are complicated, the energy consumption is large, and the use of chemical reagent raw materials Waste and other problems, the preparation method obtained ultra-fine tellurium dioxide powder, uniform particle size (particle size less than 0.5 μm), and the equipment required by the preparation method is not high, easy to operate, energy saving, environmental protection, suitable for industrial production, etc. features

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  • Preparation method and application of ultrathin 4N tellurium dioxide powder
  • Preparation method and application of ultrathin 4N tellurium dioxide powder

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Experimental program
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Effect test

Embodiment 1

[0039] Step 1: crushing the raw material tellurium ingot to a particle size of 250 μm;

[0040] Step 2: In a reaction kettle lined with polytetrafluoroethylene, add 150kg of 68wt% analytically pure nitric acid and 600kg of 36wt% analytically pure hydrochloric acid, stir evenly, and drop 150kg of the above-mentioned ground tellurium powder at 0.5kg / min at normal temperature, After the feeding is completed, continue to stir and react for 0.5h, and stop stirring after the reaction is complete and the leaching solution is light yellow;

[0041] Step 3: Pump the leachate into the plate frame with a corrosion-resistant centrifugal pump to filter;

[0042] Step 4: adding 0.2% dispersant of tellurium dioxide mass fraction to the filtrate;

[0043] Step 5: Pour the filtrate into a neutralization reactor, add deionized water to dilute it by one time, and adjust the pH to 7 with 20% ammonium hydroxide solution. Solid-liquid separation after the neutralization reaction is complete;

[...

Embodiment 2

[0049] Step 1: crush 100 kg of raw material tellurium ingots to a particle size of 200 μm, and set aside;

[0050] Step 2: In a reactor lined with polytetrafluoroethylene, add 100 wtkg of 68wt% analytically pure nitric acid and 400kg of 36% analytically pure hydrochloric acid, stir evenly, and drop 100kg of the above-mentioned ground tellurium powder at 0.3kg / min at normal temperature, After the feeding is completed, continue to stir and react for 2 hours, and stop stirring after the reaction is complete and the leaching solution is light yellow;

[0051] Step 3: Pump the leachate into the plate frame with a corrosion-resistant centrifugal pump to filter;

[0052] Step 4: adding 0.3% dispersant of tellurium dioxide mass fraction to the filtrate;

[0053] Step 5: Put the filtrate into a neutralization reaction kettle, add deionized water to dilute it by one time, and adjust the pH to 8 with 20% ammonium hydroxide. Solid-liquid separation after the neutralization reaction is c...

Embodiment 3

[0059] Step 1: crush 180 kg of raw material tellurium ingots to a particle size of 240 μm, and set aside;

[0060] Step 2: In a reaction kettle lined with polytetrafluoroethylene, add 180kg of 68wt% analytically pure nitric acid and 720kg of 36wt% analytically pure hydrochloric acid, stir evenly, and drop 180kg of the above-mentioned ground tellurium powder at 0.4kg / min at normal temperature, After the feeding is completed, continue to stir and react for 0.8h, and stop stirring after the reaction is complete and the leaching solution is light yellow;

[0061] Step 3: Pump the leachate into the plate frame with a corrosion-resistant centrifugal pump to filter;

[0062]Step 4: adding 0.5% dispersant of tellurium dioxide mass fraction to the filtrate;

[0063] Step 5: Put the filtrate into a neutralization reaction kettle, add deionized water to dilute it by one time, and adjust the pH to 9 with 20% ammonium hydroxide. Solid-liquid separation after the neutralization reaction i...

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Abstract

The invention discloses a preparation method and an application of ultrathin 4N tellurium dioxide powder. The method is characterized by comprising the steps of grinding a tellurium raw material; performing leaching by adopting a hydrochloric acid and nitric acid mixed solution at the normal temperature; performing filtering; performing neutralization by volatile alkali under the action of a dispersant; and performing thermal washing by de-ionized water, microwave drying and microwave roasting to obtain the ultrathin 4N tellurium dioxide powder. The particle size of the obtained ultrathin 4N tellurium dioxide powder is smaller than 0.5 microns. According to the ultrathin 4N tellurium dioxide powder, few preparation steps are used, the energy consumption is reduced, and the product quality is stable, so that the productivity is increased; and the technological process is simplified, and equipment is simple, so that industrial production is facilitated.

Description

technical field [0001] The invention relates to a preparation method and application of ultrafine 4N tellurium dioxide powder. Belongs to the field of preparation of tellurium dioxide Background technique [0002] At present, the preparation methods of tellurium dioxide powder mainly adopt the oxidation of elemental tellurium and oxygen to produce tellurium dioxide powder, the direct oxidation reaction of concentrated nitric acid to prepare tellurium dioxide powder, and the method of roasting hydrochloric acid and nitric acid to prepare tellurium dioxide powder. The preparation method of producing tellurium dioxide powder by oxidation of elemental Te and oxygen, the purity of the obtained tellurium dioxide powder is low, and Te needs to be heated into Te steam during the preparation process, which not only belongs to high energy consumption, but also requires high equipment. Once the Te steam leaks, it will cause Te poisoning to the operator, which is very harmful. Telluri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04B82Y40/00C30B29/46C25D3/46
CPCC01B19/004C01P2002/72C01P2004/62C01P2006/80C25D3/46C30B29/46
Inventor 侯龙超贾鹏飞产小华周增强冯超
Owner 四川中蓝基业新材料科技有限公司
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