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| Study on Recovering Titanium Dioxide from Red Mud Vitriol Leached Residue |
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Received:January 08, 2012
Revised:January 08, 2012
Accepted:January 10, 2012
Published Online:June 26, 2012
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| DOI：10.3969/j.issn.1007-7545.2012.07.006 |
| KeyWord:red mud; sulfuric acid leaching; titanium dioxide; recovering; dynamic model; orthogonal test |
| Author | Institution |
| Zhu Guo-hai |
太原理工大学材料科学与工程学院 |
| Wang Ke-qin |
太原理工大学材料科学与工程学院 |
| Wang Hao |
太原理工大学材料科学与工程学院 |
| Zhang Feng-lin |
太原理工大学材料科学与工程学院 |
| Chen Jin |
太原理工大学材料科学与工程学院 |
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| Abstract: |
| The reaction mechanism of red mud residue leached by sulfuric acid was discussed in detail. With reference to grain model, the acid leaching process could be divided into three stages, i.e. chemical reaction control stage, porosity control stage and mass transfer control stage. Analysis was conducted on the above three stages by experiments. The effects of acid leaching temperature and time, vitriol concentration, and ratio of liquid to solid (L/S) on leaching rate of titanium dioxide were investigated with orthogonal test. The optimum leaching conditions including acid leaching temperature of 150 ℃, vitriol concentration of 9 mol/L, leaching time of 2 h and L/S of 6∶1. Under the above mentioned conditions, the leaching rate of titanium dioxide reaches 95.2%. |
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