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| Effect of Sulfuric Acid Roasting on Vanadium Extraction from Stone Coal |
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Received:January 20, 2015
Revised:January 23, 2015
Accepted:January 27, 2015
Published Online:June 23, 2015
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| DOI：doi：10.3969/j.issn.1007-7545.2015.07.011 |
| KeyWord:stone coal; vanadium; sulfuric acid roasting; leaching |
| Author | Institution |
| Shi Qihua |
武汉科技大学资源与环境工程学院 |
| Zhang Yimin |
湖北省页岩钒资源高效清洁利用工程技术研究中心;武汉科技大学资源与环境工程学院 |
| Liu Tao |
湖北省页岩钒资源高效清洁利用工程技术研究中心;武汉科技大学资源与环境工程学院 |
| Huang Jing |
湖北省页岩钒资源高效清洁利用工程技术研究中心;武汉科技大学资源与环境工程学院 |
| Fu Zhaoyang |
湖北省页岩钒资源高效清洁利用工程技术研究中心;武汉科技大学资源与环境工程学院 |
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| Abstract: |
| Vanadium was extracted from refractory stone coal by sulfuric acid roasting and leaching process. Main phase changes and mineral microstructure during roasting and leaching were analyzed. The results show that vanadium leaching rate is 85.57% under the optimum conditions including dosage of sulfuric acid of 0.25 mL/g, roasting temperature of 200 ℃, roasting time of 1.5 h, and leaching ratio of liquid to solid of 1.2 (mL/g) at 80 ℃ for 60 min. During roasting, calcite converts to anhydrite, vanadium-bearing muscovite is thoroughly broken down and aluminum potassium sulfate is generated, mineral microstructure became loose and porous. Compared with conventional acid leaching, sulfuric acid roasting and leaching process has the advantages of low roasting temperature, no assistant leaching agent, short leaching time, high vanadium leaching rate, and low energy consumption. |
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