Method for preparing high-purity tellurium dioxide by using crude carp as raw material

A high-purity technology of tellurium dioxide, applied in chemical instruments and methods, selenium/tellurium oxides/hydroxides, selenium/tellurium compounds, etc., can solve the problems of few reports on the preparation of tellurium dioxide, and achieve simple methods , the effect of high product purity

Active Publication Date: 2018-12-18
中船重工黄冈贵金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are not many reports on

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1, the outside of the reaction vessel is cooled by cooling water to ensure that the reaction temperature is maintained below 35-40°C;

[0023] Step 2, concentrated nitric acid is mixed with deionized water and is 20% dilute nitric acid solution with mass fraction, adds prepared dilute nitric acid solution to reaction vessel;

[0024] Step 3: Crushing the coarse tellurium into a fine powder with a particle size of 80 meshes, slowly adding the fine powdered coarse tellurium into the dilute nitric acid solution prepared in the above step 2 and stirring evenly at a low speed so that it does not settle to the bottom of the reaction vessel Complete reaction before, the liquid-solid ratio of dilute nitric acid solution and crude tellurium is 5;

[0025] Step 4, the tellurium-containing solution generated by the reaction of step 3 is neutralized to pH=7-8 with ammonia water, and the reaction generates tellurium dioxide;

[0026] In step five, the tellurium dioxide product...

Embodiment 2

[0031] Step 1, the outside of the reaction vessel is cooled by cooling water to ensure that the reaction temperature is maintained below 18-22°C;

[0032] Step 2, concentrated nitric acid is mixed with deionized water and is 35% dilute nitric acid solution with mass fraction, adds prepared dilute nitric acid solution to reaction vessel;

[0033] Step 3: Grinding the coarse tellurium into a fine powder with a particle size of 110 mesh, slowly adding the fine powdered coarse tellurium into the dilute nitric acid solution prepared in the above step 2 and stirring evenly at a low speed so that it does not settle to the bottom of the reaction vessel Complete reaction before, the liquid-solid ratio of dilute nitric acid solution and crude tellurium is 7;

[0034] Step 4, the tellurium-containing solution generated by the reaction of step 3 is neutralized to pH=7-8 with ammonia water, and the reaction generates tellurium dioxide;

[0035] Step 5, the tellurium dioxide product that s...

Embodiment 3

[0040] Step 1, the outside of the reaction vessel is cooled by cooling water to ensure that the reaction temperature is maintained below 23-27°C;

[0041] Step 2, concentrated nitric acid is mixed with deionized water and is that 30% dilute nitric acid solution is mixed with deionized water, adds prepared dilute nitric acid solution to reaction vessel;

[0042] Step 3: Grinding the coarse tellurium into a fine powder with a particle size of 100 mesh, slowly adding the fine powdered coarse tellurium into the dilute nitric acid solution prepared in the above step 2 and stirring evenly at a low speed so that it does not settle to the bottom of the reaction vessel Complete reaction before, the liquid-solid ratio of dilute nitric acid solution and crude tellurium is 6;

[0043] Step 4, the tellurium-containing solution generated by the reaction of step 3 is neutralized to pH=7-8 with ammonia water, and the reaction generates tellurium dioxide;

[0044] Step 5, the tellurium dioxid...

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Abstract

The invention provides a method for preparing high-purity tellurium dioxide from crude tellurium as a raw material, the method effectively solves the problems of failure preparation or low purity of the high-purity tellurium dioxide due to reaction passivation and fast reaction rate reaction rate and the like in the prior art when a nitric acid method is used for preparing the high-purity tellurium dioxide from the crude tellurium as the raw material, and a high-purity tellurium dioxide product (>=5N) is prepared.

Description

technical field [0001] The invention relates to a method for preparing high-purity tellurium dioxide by using crude tellurium as raw material. Background technique [0002] In recent years, with the development of cutting-edge science and technology such as electronics, optics and optoelectronics, improving the purity of metal materials to obtain new properties has become an important direction for the development of the modern material industry. To some extent, high-purity metal materials can be considered as the basis for the development of modern high-tech. [0003] Tellurium is a semiconductor material, belonging to scattered metals, known as "the vitamin of modern industry, national defense and cutting-edge technology, the bridge to create miracles on earth", "the supporting material of contemporary high-tech new materials". In recent years, with the vigorous development of my country's aerospace, atomic energy, and electronics industries, the demand for high-purity sc...

Claims

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Application Information

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IPC IPC(8): C01B19/00
CPCC01B19/004C01P2006/80
Inventor 许顺磊丁刚强陈超李璐袁帅
Owner 中船重工黄冈贵金属有限公司
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