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Method for recovering tellurium copper from tellurium slag

A technology of tellurium slag and water leaching, which is applied in the field of metallurgy, can solve the problems of non-leaching of copper, prolonging the recovery period, and low recovery rate, and achieves the effects of simple process, improved recovery rate, and low equipment cost

Active Publication Date: 2013-11-20
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the process of extracting tellurium from the above-mentioned tellurium slag mainly includes: tellurium slag crushing—ball milling—water immersion—purification—tellurium precipitation—calcination—electrolysis—refinement of tellurium. In this process, the leaching rate of tellurium is relatively low (only 60 -70%), and the copper is basically not leached, so the tellurium content in the water leaching residue is still as high as 3-7%, and the copper content is about 10%.
The water leaching slag is returned to the converter and anode slime to re-enrich the slag, thus resulting in low tellurium recovery rate, prolonged recovery period, and failure to directly recover metal copper

Method used

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  • Method for recovering tellurium copper from tellurium slag

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Take 200g of tellurium slag containing 12.4wt% Te and 7.31wt% Cu, grind it until the particle size is 100% below 80 mesh, add water (the mass ratio of water to tellurium slag is 5:1), and the leaching temperature is 90℃, Water immersion for 2 hours at a stirring speed of 300r / min; filter to obtain 1.2L of water immersion liquid and 210.7g of water immersion residue with 25% water content. The Te content in the water immersion solution is 13.43 g / L, and the Cu content is 0.05 g / L. The composition of Te and Cu in the dry slag obtained after drying the water immersion slag containing 25% water is as follows: 5.49wt% Te and 9.24wt% Cu. That is, during water immersion, the leaching rate of Te is 65%, and Cu is basically not leaching (the leaching rate of Cu is 0.41%).

[0044] (2) Take 200g of the water leached slag with 25% water content obtained in step (1), add 70mL of concentrated sulfuric acid and stir evenly (stirring speed is 100r / min), then transfer to a roastin...

Embodiment 2

[0048] (1) Take 200g of tellurium slag containing Te 15.51wt%, Cu 6.77wt%, grind it until the particle size is 100% below 80 mesh, add water (the mass ratio of water to tellurium slag is 3:1), and the leaching temperature is 90°C, Water immersion for 3 hours at a stirring speed of 250r / min; filter to obtain 850mL of water immersion liquid and 205.6g of water immersion residue with 25% water content. The Te content in the water immersion solution is 24.82g / L, and the Cu content is 0.062g / L. The composition of Te and Cu in the dry slag obtained after drying the water-leached slag with 25% water content is as follows: 6.77wt% Te and 8.75% Cu. That is, during water immersion, the leaching rate of Te is 68%, and Cu is basically not leaching (the leaching rate of Cu is 0.39%).

[0049] (2) Take 200g of the 25% water leaching slag obtained in step (1), add 65mL of concentrated sulfuric acid and stir evenly (stirring speed is 150r / min), then transfer to a roasting furnace with a temp...

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Abstract

The invention provides a method for recovering tellurium copper from tellurium slag, which comprises the following steps: (A) water leaching: crushing tellurium slag, grinding to lower than 80 meshes, stirring by using water and leaching so as to obtain water leaching liquid and water leaching slag after filtering; (B) sulfatized calcining: calcining after adding concentrated sulfuric acid into the water leaching slag, and cooling so as to obtain calcined sand; (C) water washing: grinding the calcined sand to lower than 100 meshes, stirring by using the water, leaching, obtaining water washing liquid and water washing slag after filtering, and conveying the water washing liquid for recovering copper; and (D) alkali leaching: stirring the water washing slag by using an alkali solution, and leaching so as to obtain alkali leaching liquid and alkali leaching slag after filtering; and preparing refined tellurium after carrying out the operations of purifying, tellurium settling, calcining and electrolyzing on the alkali leaching liquid and the water leaching liquid together. According to the method provided by the invention, the recovery rate of tellurium is high. Meanwhile, copper is also recovered. The pollution to the environment is small, the process is simple, and the required equipment cost is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering tellurium copper from tellurium slag. Background technique [0002] Tellurium is an important scattered element. With the rapid development of modern science and technology, tellurium and its compounds are widely used in metallurgy, rubber, electronic appliances, petroleum, glass ceramics, aerospace, military, medicine and solar energy, etc. Industries and fields, such as the tellurium compound lead telluride is a good material for refrigeration, bismuth telluride is mainly used to make photoreceptors and materials for thermoelectric power generation, and cadmium telluride is a good solar material. [0003] As a kind of scattered metal, tellurium is relatively dispersed in the earth's crust, and it is difficult to form deposits. It is mainly recovered as tellurium slag from electrolytic anode slime of copper, lead and bismuth, acid mud for s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B15/00C22B3/04C22B3/12C22B1/06C01B19/02
CPCY02P10/20
Inventor 张记东唐爱勇向凤
Owner ZHUZHOU SMELTER GRP
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