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Method for recovering tellurium from low-concentration tellurium-containing liquid

A low-concentration, solution-based technology, applied in the direction of elements such as selenium/tellurium, can solve the problems of high production cost, alkali consumption, and great influence on acidity, and achieve the effect of low equipment material requirements, strong practicability, and high corrosion

Active Publication Date: 2015-05-06
JIANGXI COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copper powder replacement method is the main method for recovering tellurium from concentrated sulfuric acid solution in industry. This method uses copper powder and tellurium to generate copper telluride to recover tellurium. However, the production process of copper powder is complicated, and a large amount of copper powder will be consumed when recovering tellurium, and The production cost of the copper powder replacement method is high, and the subsequent separation of copper and tellurium is also complicated
Solvent extraction is greatly affected by acidity, and it is difficult to adapt to high-concentration sulfuric acid solution. The solution must be treated before extraction can be used to extract tellurium.
The neutralization method consumes a lot of alkali, produces a lot of salts, and the grade of tellurium is low
[0006] At present, the concentration of tellurium-containing liquid that can be recovered by refined tellurium manufacturers is basically above 1g / l. When the tellurium-containing liquid tellurium content is lower than 1g / l, methods such as copper powder replacement, solvent extraction, neutralization, and microorganisms cannot be effectively recovered. The tellurium in it can only be discharged with the waste water, resulting in the failure of comprehensive utilization of tellurium resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Mixing process

[0032] The low-concentration tellurium-containing liquid produced in copper smelting enterprises is 1.0 g / l, firstly heated to 50°C, added ferric sulfate solution, stirred at constant temperature for 0.5h, then added arsenic acid solution, stirred at constant temperature for 0.5h, and finally added copper sulfate solution, Stir at constant temperature for 0.5h, and control Fe: 0.10 g / l, As: 5.0 g / l, Cu: 0.10 g / l in the mixture.

[0033] 2. Settling process

[0034] Add the mixed solution obtained in step 1 into dilute sulfuric acid (V 水 :V 浓硫酸 =4:1) Adjust the pH value of the mixture to 0.5, stir at a constant temperature for 0.5h, slowly add sodium sulfite sedimentation agent, control the solubility of the sedimentation agent to 5 g / l, stir at a constant temperature for 1h, and filter to deposit most of the tellurium in the mixture A tellurium enrichment material containing 55.36% by mass of tellurium was obtained, and the tellurium content was r...

Embodiment 2

[0038] 1. Mixing process

[0039] The low-concentration tellurium-containing liquid produced in copper smelting enterprises is 0.5 g / l. First, heat up to 70°C, add ferric sulfate solution, stir at a constant temperature for 1.0h, then add arsenic acid solution, stir at a constant temperature for 1.0h, and finally add copper sulfate solution. Stir for 1.0h, and control Fe: 0.5 g / l, As: 10 g / l, Cu: 0.5 g / l in the mixture.

[0040] 2. Settling process

[0041] Add the mixed solution obtained in step 1 into dilute sulfuric acid (V 水 :V 浓硫酸 =4:1) Control the pH value of the mixture to 1.5, stir at a constant temperature for 1.0h, slowly add sodium sulfite sedimentation agent, control the solubility of the sedimentation agent to 20 g / l, stir at a constant temperature for 2.5h, and filter to remove most of the tellurium in the mixture A tellurium enrichment material with a mass percentage of 53.51% of tellurium was deposited, and the tellurium content dropped to 8.9 m g / l after th...

Embodiment 3

[0045] 1. Mixing process

[0046] The low-concentration tellurium-containing liquid produced in copper smelting enterprises is 0.1 g / l. First, heat up to 90°C, add ferric sulfate solution, stir at a constant temperature for 1.5 hours, then add arsenic acid solution, stir at a constant temperature for 1.5 hours, and finally add copper sulfate solution. Stir for 1.5h, and control Fe: 1.0 g / l, As: 20 g / l, Cu: 1.0 g / l in the mixture.

[0047] 2. Settling process

[0048] Add the mixed solution obtained in step 1 into dilute sulfuric acid (V 水 :V 浓硫酸 =4:1) Control the pH value of the mixture to 2.5, stir at a constant temperature for 1.5h, slowly add sodium sulfite sedimentation agent, control the solubility of the sedimentation agent to 50 g / l, stir at a constant temperature for 5h, and filter to deposit most of the tellurium in the mixture A tellurium enrichment material containing 51.09% by mass of tellurium was obtained, and the tellurium content was reduced to 7.6 mg / l afte...

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PUM

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Abstract

The invention relates to a method for recovering g tellurium from a low-concentration tellurium-containing liquid. The method comprises a mixing step and a settling step, wherein the mixing step comprises the processes of heating the tellurium-containing liquid, adding a ferric sulfate solution, stirring at constant temperature, adding an arsenic acid solution, stirring at constant temperature, adding a copper sulfate solution and stirring at constant temperature to obtain mixed liquor; the settling step comprises the processes of adding the obtained mixed liquor into dilute sulfuric acid to control the pH value, stirring at constant temperature, slowly adding a sodium sulfite settling agent, stirring at constant temperature and filtering to obtain a rich-tellurium product. According to the method, the treatment time is shortened, the equipment corrosion is reduced and the recovery rate is high.

Description

technical field [0001] The invention relates to a method for recovering tellurium from low-concentration tellurium-containing liquid, and belongs to the technical field of nonferrous metal extraction metallurgy. Background technique [0002] The main applications of tellurium as a metallurgical additive are (1) Adding 0.04% tellurium to low-carbon high-speed cutting steel and high-strength steel can improve its cutting performance, and the cutting speed can reach 195m / min, which is 3 times higher than the general one; (2 ) Adding 0.01-0.1% tellurium to ductile cast iron can play a role in grain refinement (3) Adding 0.5% tellurium to copper-based alloys can not only significantly improve cutting performance, but also improve electrical and thermal conductivity and anti-fatigue properties, especially suitable for strict and complex electronic instrument components; (4) Adding 0.01-0.5% tellurium to lead (tin or aluminum) based alloys can improve its corrosion resistance, hard...

Claims

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Application Information

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IPC IPC(8): C01B19/02
CPCC01B19/02
Inventor 杨兴文涂相林吴杰祝志兵赵海涛刘宏郑春到邹志武钟志燕
Owner JIANGXI COPPER
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