Wet method used for extracting products from low-grade complex material containing tellurium and selenium

A low-grade, all-wet technology, applied in binary selenium/tellurium compounds, etc., can solve the problems of low production efficiency, long operation cycle, incomplete roasting, etc., and achieve the effect of high grade, effective separation and recovery

Active Publication Date: 2013-11-20
JIANGXI COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For many years, various manufacturers of tellurium-selenium have been using a relatively traditional process to process this material, that is, the material is directly sulfated and roasted to recover tellurium-selenium. This process is very difficult to roast because the grade of selenium in the material is 10-20%. Incomplete, multiple roasting is required, high fuel consumption, long operation cycle and low production efficiency

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  • Wet method used for extracting products from low-grade complex material containing tellurium and selenium

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Sodium leaching process: The chemical composition of low-grade complex selenium materials is: Se11.72%, Zn1.41%, Te2.97%, Fe1.16%, according to the liquid-solid ratio of 4:1, water and selenium-containing materials are added to the reaction In the tank, stir, add caustic soda at a concentration of 8.0g / L, add sodium nitrate at a concentration of 120g / L, heat up to 85°C, and react for 4 hours. Secondary leaching, the secondary leaching solution is used as the primary leaching mother liquor, the secondary leaching slag can be sent to sulfide roasting to recover residual selenium, and the primary leaching solution is sent to the decomposition process. The leaching rate of selenium is 95.21%, and tellurium basically stays in the slag phase and enters the next step of recovery.

[0025] Decomposition and generation process: add 10g / L sulfuric acid to the primary leaching solution under stirring conditions, adjust the acidity to PH: 2, control the temperature at 85°C, and the...

Embodiment 2

[0032] Sodium leaching process: the chemical composition of low-grade complex selenium materials is: Se11.72%, Zn1.41%, Te2.97%, Fe1.16%, water and selenium-containing materials are added to the reaction tank according to the liquid-solid ratio of 5:1 During the process, stir, add caustic soda at a concentration of 6.0g / L, add sodium nitrate at a concentration of 150g / L, heat up to 65°C, and react for 8 hours. The secondary leaching, the secondary leaching solution is used as the primary leaching mother liquor, the secondary leaching slag can be sent to sulfide roasting to recover residual selenium, and the primary leaching solution is sent to the decomposition process. The selenium leaching rate was 95.34%, and the tellurium basically remained in the slag phase and entered the next step of recovery.

[0033]Decomposition process: add 30g / L sulfuric acid to the primary leaching solution under stirring conditions, adjust the acidity to PH: 4, control the temperature at 65°C, an...

Embodiment 3

[0040] Sodium leaching process: the chemical composition of low-grade complex selenium materials is: Se11.72%, Zn1.41%, Te2.97%, Fe1.16%, water and selenium-containing materials are added to the reaction tank according to the liquid-solid ratio of 6:1 During the process, stir, add caustic soda at a concentration of 10.0g / L, add sodium nitrate at a concentration of 200g / L, heat up to 95°C, and react for 10 hours. The secondary leaching, the secondary leaching solution is used as the primary leaching mother liquor, the secondary leaching slag can be sent to sulfide roasting to recover residual selenium, and the primary leaching solution is sent to the decomposition process. The selenium leaching rate was 95.06%, and the tellurium basically remained in the slag phase and entered the next step of recovery.

[0041] Decomposition process: add 50g / L sulfuric acid to the primary leaching solution under stirring conditions, adjust the acidity to PH: 6, control the temperature at 50°C,...

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Abstract

The invention provides a wet method used for extracting products from low-grade complex material containing tellurium and selenium. The wet method comprises following steps: leaching by sodium sulfite; decomposition and generation, reduction of selenium, oxidation, reduction of tellurium, and oxidation of zero-valent tellurium. The grade of the selenium products obtained by using the wet method is high; the selenium in the selenium-enriched products can be transformed into soluble chloride compounds under acidic conditions with addition of sodium chlorate and common salt, and the soluble chloride compounds are dissolved. Zero-valent tellurium is formed and transferred into slag phase after reduction by SO2, so that preliminary separation of zero-valent tellurium from other impurity elements is realized; TeO2 raw material which can be used for pure tellurium production lines is obtained by oxidation-neutralization of zero-valent tellurium, so that effective separation and recovery of tellurium valuable metal are realized.

Description

technical field [0001] The invention relates to extracting tellurium and selenium precious metals from low-grade complex tellurium-selenium materials, producing 90-99% crude selenium, and providing tellurium dioxide as an available raw material for the production of refined tellurium, belonging to the technical field of non-ferrous metal extraction metallurgy. Background technique [0002] There are a large number of low-grade complex materials containing tellurium and selenium in the market. The grade of selenium is 10-20%. Effective separation creates difficulties for conventional selenium metallurgical processes. Such low-grade complex materials containing tellurium and selenium must first be purified to 90-99% crude selenium before further production of high-quality selenium dioxide or industrial selenium products. How to realize the separation and recovery of tellurium selenium and impurities in raw materials, and directly obtain purer crude selenium and usable telluri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
Inventor 胡建辉曾晓冬涂相林吴杰祝志兵刘永平丁红浪
Owner JIANGXI COPPER
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