A method for improving the indium leaching rate of indium-antimony-lead material

A technology containing indium, antimony and lead, and leaching rate, which is applied in the field of metallurgy, can solve the problems of difficult leaching of indium, large amount of waste water, waste of scattered metal indium, etc., and achieve the effect of increasing economic value, increasing leaching rate, and efficient selective leaching

Active Publication Date: 2020-11-27
湖南腾驰环保科技有限公司
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  • Abstract
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Problems solved by technology

[0002] Indium is mainly associated with minerals such as lead, zinc, antimony, and copper. In the process of smelting and extracting main metals, indium concentrates will be produced. Among them, indium and lead, antimony, etc. form alloys or slag. In the method, indium is difficult to be leached, and a very high liquid-solid ratio is required. Under the condition of strong hydrochloric acid oxidation leaching, the leaching rate of indium is 60-80%, and some materials contain indium at 0.5-15%, which is low. The rate of waste of precious scattered metal indium is extremely high, and the amount of waste water is huge, which also brings great pressure to environmental protection.

Method used

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  • A method for improving the indium leaching rate of indium-antimony-lead material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] According to the process steps, take 100g of indium antimony lead slag (in terms of chemical element mass percentage: Sb43.62%, In 6.32%, Pb 6.26%), add 30g / L hydrochloric acid+100g / L Cl - Add 40g of iron powder to 800mL of acid solution at a temperature of 80°C, and mechanically stir for 3h to obtain leaching residue and leaching solution. The hydrochloric acid at the leaching end point is 20g / L, the leaching slag contains 0.02wt% indium, 66.8wt% lead + antimony, and the leaching rate of indium is 99.72%. The antimony-lead slag is a good raw material for antimony recovery.

Embodiment 2

[0047] According to the process steps, take 200g indium antimony lead slag (in terms of chemical element mass percentage: Sb43.62%, In 6.32%, Pb 6.26%), add 40g / L hydrochloric acid+120g / L Cl -Add 100 g of iron powder to 1800 mL of acid solution at a temperature of 70 ° C, and mechanically stir for 4 hours to obtain leaching residue and leaching liquid. The hydrochloric acid at the leaching end point is 26g / L, the slag contains 0.026wt% indium, 60.8wt% lead + antimony, and the leaching rate of indium is 99.32%.

[0048] Adjust the pH value of the leach solution to 2, use the extractant p204 (concentration 30%) to perform four-stage extraction of indium, the extraction rate of indium reaches 99%, separate the indium and the extracted liquid, and recover the extracted indium;

[0049] Adjusting the pH value of the extracted liquid to 5, introducing oxygen to remove iron to obtain iron slag and iron-removed liquid, the iron-removed liquid is returned to the above-mentioned acid so...

Embodiment 3

[0051] According to the process steps, in industrial production, 30g / L hydrochloric acid + 100g / L Cl - acid solution 8m 3 , add 1000kg indium antimony lead slag (in terms of chemical element mass percentage: Sb 43.62%, In 6.32%, Pb 6.26%), heat up to 60°C, stir for 0.5h, start adding iron powder, add 4 times in batches every 0.5h, Add 80kg of iron powder each time, a total of 320kg of iron powder is added, take the liquid to test for lead+antimony<1g / L, indium is 7.7g / L, the slag contains 0.036wt% indium, the leaching rate of indium is greater than 99%, and the leaching rate of lead+antimony is less than 0.2wt%, to achieve the effect of efficient and selective leaching of indium.

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Abstract

The invention belongs to the technical field of metallurgy, and in particular relates to a method for increasing the indium leaching rate of materials containing indium, antimony and lead. In the method, the material containing indium, antimony, lead, and bismuth is leached with an acid solution, and iron powder is added to selectively replace the lead, bismuth, and antimony into metal slag, and the leaching slag and leachate are separated to obtain the leaching slag and leachate; the pH value of the leachate is adjusted, and indium is extracted to separate and obtain indium and the extracted liquid, recovering the extracted indium; adjusting the pH value of the extracted liquid, passing through oxygen to remove iron, and obtaining iron slag and iron-removed liquid. The method of the invention has short technological process, is economical and practical, has good operating environment and high cleanliness, and can realize the purpose of efficiently and selectively leaching indium (the leaching rate of indium reaches more than 98%). The extraction rate of indium reaches 99%, which effectively guarantees the recovery of indium. The solution in the whole process is closed and circulated, no waste water is discharged, and it is clean and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for increasing the indium leaching rate of materials containing indium, antimony and lead. Background technique [0002] Indium is mainly associated with minerals such as lead, zinc, antimony, and copper. In the process of smelting and extracting main metals, indium concentrates will be produced. Among them, indium and lead, antimony, etc. form alloys or slag. In the method, indium is difficult to be leached, and a very high liquid-solid ratio is required. Under the condition of strong hydrochloric acid oxidation leaching, the leaching rate of indium is 60-80%, and some materials contain indium at 0.5-15%, which is low. The rate of waste of precious scattered metal indium is very high, and the amount of waste water is huge, which also brings great pressure to environmental protection. How to fully recover these high-value metals has extremely important ec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B58/00C22B3/10C22B3/46C22B3/26C22B30/02
CPCC22B3/10C22B3/46C22B30/02C22B58/00C22B3/26Y02P10/20
Inventor 周再明陈世民
Owner 湖南腾驰环保科技有限公司
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