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Method for separating tellurium from tellurium slag

A technology for tellurium slag and tellurium powder, which is applied in the field of hydrometallurgy for separating tellurium, can solve problems such as inability to directly recycle, and achieve the effects of short processing time, reduction of the amount of returned slag, and small transformation range.

Inactive Publication Date: 2009-08-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (3) The water leaching slag is returned to the original heavy metal anode slime treatment process, and valuable metals such as copper and tin cannot be directly recovered

Method used

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  • Method for separating tellurium from tellurium slag

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Take 1000 g of tellurium slag produced in the copper smelting process containing Te 8.5%, Se 0.45%, Cu 9.6%, and Bi 12%, and grind it until the particle size is 100% less than 0.074mm. After leaching for 3 hours under the conditions of 3:1 and stirring speed of 150r / min, it was filtered. The volume of the water immersion liquid was 3.1L, and the composition (g / L): Te 13.2, Se 0.58; the weight of the water leaching residue was 720g after drying, containing Tellurium is 6.14%, and the leaching rate of tellurium slag is 48.0%. Heat the water immersion solution to 80°C, add 6.8g sodium sulfide and 16g calcium chloride, continue to stir for 1 hour, then filter, and neutralize the purified solution with 3mol / L sulfuric acid solution until pH = 5, continue to stir for 2 hours, and then filter to produce The obtained crude tellurium dioxide weighs 53 g after drying and contains 76.0% tellurium.

[0035] The water leaching residue was stirred and leached in a hydroch...

Embodiment 2

[0037]Example 2: Take 500g of tellurium slag produced in the bismuth smelting and smelting process containing Te 36%, Se 0.6%, Cu 6%, and Bi 24%, and grind it until the particle size is 100% less than 0.074mm. Ratio 3:1, stirring speed 150r / min under the conditions of leaching for 4h and then filtering, the volume of the water immersion liquid is 1.6L, the composition (g / L): Te57.37, Se0.75; the weight of the water leaching residue after drying is 350g, containing 25.2% tellurium, the leaching rate of tellurium slag is 51.0%. Heat the water immersion solution to 80°C, add 4.8g sodium sulfide and 10g calcium chloride, continue to stir for 1 hour, then filter, and neutralize the purified solution with 4mol / L sulfuric acid solution until pH = 5, continue to stir for 2 hours, and then filter to produce The crude tellurium dioxide produced weighs 120 g after drying and contains 76.5% tellurium.

[0038] The water leaching residue was stirred and leached in a hydrochloric acid solu...

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Abstract

The invention relates to a method for separating tellurium from tellurium slag, which comprises the following steps: firstly, grinding the tellurium slag, leaching out the obtained product in an aqueous solution, purifying and neutralizing a water leaching solution, and producing tellurium dioxide; secondly, performing hydrochloric acid leaching on water leaching residue in a hydrochloric acid system, cooling and filtering an acid leaching solution, and returning acid leaching residue to an anode sludge treatment process; thirdly, performing controlled potential reduction on the acid leaching solution to produce coarse tellurium, and performing roasting and impurity removal on the coarse tellurium and the tellurium dioxide produced by neutralization to obtain pure tellurium dioxide; and fourthly, using the conventional method to reclaim valuable metals such as copper, bismuth, tin, and the like from a reduced solution respectively. The total tellurium leaching rate of the method is as high as more than 98 percent, and the produced coarse tellurium has the advantages of low content of impurity elements, small amount of return slag, small modification amplitude of equipment, short treatment time, and low treatment cost.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of metallurgy, in particular to a hydrometallurgical method for separating tellurium from tellurium slag. Background technique [0002] The anode slime produced in the electrolytic refining process of heavy metals such as copper and bismuth is enriched with precious metals and scattered metals. In the traditional anode slime pyrolysis process, tellurium is enriched in the soda slag produced in the oxidation refining process, also known as tellurium slag , is an important raw material for extracting tellurium. The process of extracting tellurium from soda slag is to crush the soda slag to 10-30mm first, then wet ball milling and then stir and leach, the leached slag is returned to the noble lead furnace for treatment, and sodium sulfide and calcium chloride are added to the leaching solution to remove lead and copper and silicon and other impurities, the purified solution is neutralized...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
Inventor 刘伟锋杨天足马辉张杜超刘伟任晋
Owner CENT SOUTH UNIV
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