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Deep impurity-removing method for crude tellurium powder

A technology of deep impurity removal and tellurium powder, applied in the direction of element selenium/tellurium, etc., can solve the problems of lengthy process, instability, and great impact on product quality

Inactive Publication Date: 2008-09-10
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wet process mainly recovers tellurium from the lead-tellurium slag produced in the tellurium separation process, and the main process is alkali leaching-Na 2 S removal-neutralization tellurium-alkali-soluble-Na 2 S, CaCl 2 Purification-secondary neutralization-alkali dissolution-electrodeposition process, the process is lengthy, and the impurity removal effect is not good, especially when Na 2 The S method is not effective in purifying As and Sb, and at the same time, due to the use of Na 2 S removal, the S contained in the solution 2- It is easy to generate H in the process of secondary neutralization wastewater treatment 2 S gas causes environmental pollution; there are also studies on the use of calcination and reduction methods to remove As and Sb, but the operation is complicated and labor-intensive, and the removal rate of As and Sb is only 80.7%, especially without considering the removal of selenium , the quality of the product is greatly affected by the composition of the raw materials and is unstable. The recovery rate of tellurium smelting can only reach 77%.
[0003] At present, in the process of wet production of tellurium, the content of impurity elements contained in the tellurium powder after the process of removing selenium is not high but there are many types, mainly As, Sb, Sn, Ni, Fe, etc. The properties of these elements are different , using conventional Na 2 S precipitation and other impurities removal effect is not good

Method used

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  • Deep impurity-removing method for crude tellurium powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add the dried tellurium powder into the container, oxidize it with 1.2 times the theoretical amount of nitric acid to obtain tellurium oxynitrate powder, filter the filter residue and wash it with pure water until the pH value is 3; add 80g / l sodium hydroxide solution in the container, When the temperature rises to 30°C, add tellurium oxide nitrate powder until the tellurium oxide nitrate powder is completely dissolved, filter the solution, return the filtered solution to the container, slowly add sulfuric acid to neutralize while stirring, adjust the pH value to 4.0, filter Washing to obtain tellurium dioxide powder with a purity of 99.95.

Embodiment 2

[0019] Add the dried tellurium powder into the container, oxidize it with 2.5 times the theoretical amount of nitric acid to obtain tellurium oxynitride powder, filter the filter residue and wash it with pure water until the pH value is 4; add 80g / l sodium hydroxide solution in the container, When the temperature rises to 40°C, add tellurium oxide nitrate powder until the tellurium oxide nitrate powder is completely dissolved, filter the solution, return the filtered solution to the container, slowly add sulfuric acid to neutralize while stirring, adjust the pH value to 5.5, filter Wash to obtain tellurium dioxide powder with a purity of 99.98.

Embodiment 3

[0021] Add the dried tellurium powder into the container, oxidize it with nitric acid 1 times the theoretical amount to obtain tellurium oxynitrate powder, filter the filter residue and wash it with pure water until the pH value is 3; add 80g / l sodium hydroxide solution in the container, When the temperature rises to 50°C, add tellurium oxide nitrate powder until the tellurium oxide nitrate powder is completely dissolved, filter the solution, return the filtered solution to the container, slowly add sulfuric acid to neutralize while stirring, adjust the pH value to 7.0, filter Washing to obtain tellurium dioxide powder with a purity of 99.95.

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Abstract

The invention provides a method for removing deep impurities of coarse tellurium powders, relating to a method for removing deep impurities in the coarse tellurium powders which are recovered from copper anode slimes. The invention is characterized in that in the process of impurity removal, coarse tellurium powders react with nitric acids, which makes the tellurium in the coarse tellurium powders oxidized into the tellurium dioxide and makes impurity elements in the coarse tellurium powders form nitrates to be dissolved into the solution, and after filtering and separation, impurity nitrates are removed; after being washed, filter slimes are dissolved by sodium hydroxide, and solid impurities are obtained by filtering and separation; and the filtrate is added with sulphuric acids for neutralization, and tellurium dioxide powders are obtained after filtering. The method of the invention adopts the nitric acid oxidation impurity removal process, thereby major impurity elements in the coarse tellurium powders can be removed; moreover, the purity of tellurium dioxide powders obtained by the method is more than 99.9 percent.

Description

technical field [0001] The invention relates to a method for deep impurity removal of coarse tellurium powder, which relates to a method for deep impurity removal of tellurium powder recovered from copper anode slime. Background technique [0002] There are two methods for recovering tellurium from copper anode slime: fire method and wet method. The pyrotechnic process recovers tellurium from soda slag produced from copper anode slime. The wet process mainly recovers tellurium from the lead-tellurium slag produced in the tellurium separation process, and the main process is alkali leaching-Na 2 S removal-neutralization tellurium-alkali-soluble-Na 2 S, CaCl 2 Purification-secondary neutralization-alkali dissolution-electrodeposition process, the process is lengthy, and the impurity removal effect is not good, especially when Na 2 The S method is not effective in purifying As and Sb, and at the same time, due to the use of Na 2 S removal, the S contained in the solution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
Inventor 马玉天陈国梁王兴陈大林张波陈云峰吴志明
Owner JINCHUAN GROUP LIMITED
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