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| Comprehensive Recovery of Valuable Elements from Neutralized Slag of Lead-Zinc Smelting Wastewater |
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Received:December 15, 2024
Revised:December 20, 2024
Accepted:December 23, 2024
Published Online:February 18, 2025
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| DOI：doi：10.20237/j.issn.1007-7545.2025.02.025 |
| KeyWord:neutralizing slag; acid leaching; comprehensive recovery |
| Author | Institution |
| LU Wenpeng |
云南驰宏锌锗股份有限公司 |
| DI Haokai |
昆明理工大学冶金与能源工程学院 |
| YANG Kun |
昆明理工大学冶金与能源工程学院 |
| PEI Qifei |
云南驰宏锌锗股份有限公司 |
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| Abstract: |
| The recovery value of neutralized slag in lead-zinc smelting wastewater is high and the treatment difficulty is high. The wet treatment process is the mainstream trend in the future development. According to the characteristics of neutralized slag, a countercurrent acid leaching process was proposed to recover the valuable metals. The influence of different reaction factors on the leaching effect was investigated. The results showed that under the conditions of liquid-solid ratio 3:1, slag-acid ratio 1.67, initial sulfuric acid concentration of 200 g/L, mature sulfuric acid concentration of 98%, room temperature (self-heating leaching) and leaching time of 30 min, the leaching rates of zinc, manganese and germanium in neutralized slag were more than 95%, and the leaching rates of magnesium were more than 85%. The technology can transform calcium in the neutralized slag into gypsum slag product, arsenic into iron arsenate solid arsenic product, and obtain active zinc oxide and basic magnesium carbonate products that can be sold abroad. This technology can provide theoretical basis for green production of Chinese enterprises. |
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