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| Study on Phase Transformation and Ammonia Leaching of Low-Grade Sulfur-Oxygen Mixed Zinc Ore Bearing High Silicon and Calcium and Low Sulfur |
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Received:April 04, 2016
Revised:April 07, 2016
Accepted:April 08, 2016
Published Online:August 19, 2016
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| DOI：doi：10.3969/j.issn.1007-7545.2016.09.002 |
| KeyWord:sulfur-oxygen mixed zinc ore; phase transformation; ammonia leaching |
| Author | Institution |
| Zhang Yadong |
昆明理工大学冶金与能源工程学院 |
| Hua Yixin |
昆明理工大学冶金与能源工程学院 |
| Xu Cunying |
昆明理工大学冶金与能源工程学院 |
| Li Jian |
昆明理工大学冶金与能源工程学院 |
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| Abstract: |
| Based on characteristics of low grade sulfur-oxygen mixed zinc ore bearing high silicon and calcium and low sulfur, sphalerite and hemimorphite in ore were transformed into easily soluble ZnO, and sulfur was fixed as CaSO4 by CaCO3 and CaO contained in ore applying oxidation roasting process at low temperatures. The results show that 75% of zinc can be leached with ammonia-ammonium sulfate solution from roasted products at optimum temperature of 300 ℃, while only 52% of zinc can be leached directly from sulfur-oxygen mixed zinc ore. Leaching rate of zinc is improved by phase transformation in oxidation roasting without emission of SO2 and formation of silica gel during leaching. |
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