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| Study on Purification of Chlorination Leachate of Pb-Ag Residue and Recovery of Valuable Metals |
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Received:May 15, 2020
Revised:May 20, 2020
Accepted:May 22, 2020
Published Online:August 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.09.002 |
| KeyWord:chlorination leachate; replacement; lead; silver; iron removal |
| Author | Institution |
| Zhou Qi-fan |
矿冶科技集团有限公司 |
| Liu San-ping |
矿冶科技集团有限公司 |
| Wang Yu-fang |
矿冶科技集团有限公司 |
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| Abstract: |
| Purification-replacement process was applied to treat chlorination leachate of Pb-Ag residue to extract silver and lead. Technological influence conditions of replacement of silver with lead powder and replacement of lead with iron powder were studied. The results show that Fe3+ is easy hydrolysis and iron is removed by neutralization. Iron can be completely removed by adjusting pH value of solution to 4.0 with lime. Replacement rate of silver is 98% above with residual silver concentration in solution of 1 mg/L below under the conditions including dosage of lead powder of 6 g/L, pH value of 1.5-2.5, temperature of 60 ℃, and replacement time of 40-60 min. Lead in solution can be replaced by two-stage countercurrent process. The comprehensive replacement rate of lead is 87.08%, and lead content in final replacement product is 90% above, which meets requirements of refining. |
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