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| Solvent Extraction Behavior of Vanadium from Direct Acidic Leaching and Roasting Acidic Leaching |
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Received:November 06, 2013
Revised:November 10, 2013
Accepted:November 11, 2013
Published Online:April 22, 2014
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| DOI：10.3969/j.issn.1007-7545.2014.05.008 |
| KeyWord:direct acidic leaching; roasting acidic leaching; vanadium; solvent extraction; stone coal |
| Author | Institution |
| WANG Fei |
武汉科技大学资源与环境工程学院 |
| ZHANG Yi-min |
武汉科技大学资源与环境工程学院 |
| LIU Tao |
武汉科技大学资源与环境工程学院 |
| HUANG Jing |
武汉科技大学资源与环境工程学院 |
| LI Dao |
武汉科技大学资源与环境工程学院 |
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| Abstract: |
| Stone coal was direct acidic leached and roasting acidic leached respectively. The effects of introducing fluoride into leaching systems on vanadium extraction were investigated. The results show that it is reasonable to adopt direct leaching with fluoride and solvent extraction. The leaching rate of vanadium is 92.39%, pre-treatment loss efficiency of vanadium is 1.12%, CaO consumption is 6.38 t per ton V2O5, and a three-stage counter-current solvent extracting efficiency of vanadium is 98.05% with stable procedures. Furthermore, the choice between the two processes and introduction of fluoride into leaching system had significant effects on solvent extraction of vanadium. Direct acidic leaching may introduce organics from stone coal into aqueous solution. The organics form interfacial membrane during solvent extraction, which is an important factor to produce emulsification. Blank-roasting can remove influence of organics, but increase contents of various elements other than vanadium, which may also contribute to emulsification. Existing in the form of [AlF5]2- and [SiF6]2-, fluorine can facilitate solvent extraction by hindering production of silicon-bearing colloids, fine particles and interfacial membrane. However, emulsification may occur again with content of various elements other than vanadium reaching to a maximum value. |
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