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| Continuous solvent extraction of copper from the chloride leaching solution of copper anode slime |
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Received:March 06, 2019
Revised:March 19, 2019
Accepted:March 25, 2019
Published Online:December 24, 2019
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| DOI： |
| KeyWord:copper; chloride leaching solution; solvent extraction; third phase; emulsification |
| Author | Institution |
| XIE Keng |
BGRIMM Technology Group,Beijing;China |
| WANG Haibei |
BGRIMM Technology Group,Beijing;China |
| LIU Sanping |
BGRIMM Technology Group,Beijing;China |
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| Abstract: |
| In order to solve the problem that high copper content in chloride leaching solution of copper anode slime made it difficult to replace rare and precious metals and caused large losses, Lix984 was used to extract and separate copper. Continuous solvent extraction tests were carried out in mixer-settler to investigate the extraction of copper and the existing problems were assessed and corresponding solutions were suggested. It was found that it was technically feasible to separate and recover copper from chloride leaching solution containing 10~20g/L of copper and ~200g/L of Cl-. Under the conditions of mixing time of 3 min, extraction phase ratio (O/A) of 2:1 and stripping aqueous phase of 180-260 g/L sulfuric acid, the recovery of copper could reach over 99% after four-stage extraction, two-stage washing and two-stage stripping. Gold, silver, palladium, lead and nickel were not extracted and only a small amount was entrained, which could be washed and recovered. The accumulation of interfacial contaminants and emulsification are mainly related to the factors such as high solid content of feed solution, hydrolysis of metal ions, improper phase ratio and stirring speed, degradation of extractant, etc. The stable operation of solvent extraction can be achieved by means of fine filtration, adjusting pH in transition tank, real-time monitoring of flow rate and stirring speed, periodic supplementation of extractant and removal of third phase. |
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