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| Optimization Extraction of Indium by Microwave Enhanced Roasting Process from Zinc Oxide Dust |
| Received:September 25, 2017 Revised:September 28, 2017 |
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| DOI：10.3969/j.issn.1007-7545.2018.03.010 |
| KeyWord:zinc oxide dust; microwave sulfate roasting; indium leaching; response surface methodology; optimization |
| Author | Institution |
| CHANG Jun |
铜仁学院 材料与化学工程学院 |
| ZHANG Li-bo |
微波能工程应用及装备技术国家地方联合工程实验室 |
| PENG Jin-hui |
微波能工程应用及装备技术国家地方联合工程实验室 |
| Wang wan-kun |
贵州理工学院 材料与冶金工程学院;贵州理工学院 材料与冶金工程学院 |
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| Abstract: |
| Indium was leached from refractory zinc oxide flue dust (ZOFD) by microwave sulfating roasting followed by water leaching. Response Surface Methodology (RSM) was applied to optimize roasting process. The optimum process parameters and two order polynomial equation models with high fitting degree were obtained by three-factor at three-level test designed by Box-Behnken Design (BBD) applying indium leaching rate as response value, and roasting temperature, ratio of acid to ZOFD, and roasting time as independent factors. The results indicate that the theoretical indium leaching rate accords with model predicts and experimental value is 92.89% and 92.78% respectively under the optimum conditions including roasting temperature of 208 ℃, ratio of acid to ZOFD of 0.5 (mL/g), roasting and duration of 93 min. This model can be used to predict indium leaching from zinc oxide dust by microwave roasting with sulfuric acid. |
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