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| Recovery of Zinc and Enrichment of Indium from Indium-bearing Zinc Oxide Flue Dust under Microwave Assisted Neutral Leaching |
| Received:October 21, 2021 Revised:October 26, 2021 |
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| DOI：doi：10.3969/j.issn.1007-7545.2022.02.011 |
| KeyWord:microwave; neutral leaching; zinc oxide flue dust; indium |
| Author | Institution |
| CHANG Jun |
铜仁学院材料与化学工程学院 |
| WANG Zi-yang |
铜仁学院材料与化学工程学院 |
| YU Ju-hua |
铜仁学院材料与化学工程学院 |
| GUO Ting |
铜仁学院材料与化学工程学院 |
| LI Xue-peng |
铜仁学院材料与化学工程学院 |
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| Abstract: |
| Indium-bearing zinc oxide flue dust generated by reductive volatilization of zinc leaching residue in rotary kiln was used as raw material. Microwave assisted neutral leaching method was recommended to enrich indium and zinc was recovered as much as possible from indium-bearing zinc oxide flue dust based on analysis of its chemical composition and microscopic morphology. Effects of microwave power, concentration of sulfuric acid, temperature, leaching time, and L/S on zinc leaching rate and indium enrichment rate in flue dust were investigated, and phase transformation of leaching residues were analyzed. The results show that zinc leaching rate is 80.31%, indium enrichment rate is 42.23%, and end point pH value is 5.1 under the conditions including sulfuric acid concentration of 65 g/L, holding time of 10 min, leaching temperature of 50 ℃, L/S of 4 mL/g, and microwave power of 600 W. The neutral system environment is negligible for Fe leaching. This method can effectively separate zinc and indium from zinc oxide dust, and indium is successfully enriched, which provides a favorable guarantee for efficient recovery of indium in the subsequent process. |
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