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| Two-stage Neutralization Treatment and Precipitation Scandium from Waste Vitriol Solution in Titanium Dioxide Production |
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Received:December 19, 2013
Revised:December 23, 2013
Accepted:December 24, 2013
Published Online:July 21, 2014
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| DOI：doi：10.3969/j.issn.1007-7545.2014.08.012 |
| KeyWord:titanium white; waste vitriol; two-stage neutralization; scandium; precipitation |
| Author | Institution |
| Haihong Zhan |
广西冶金研究院 |
| Huanlong Liang |
广西冶金研究院 |
| Yanjing Fan |
广西冶金研究院 |
| Taiyuan Huang |
广西冶金研究院 |
| Danqi Guo |
广西冶金研究院 |
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| Abstract: |
| Waste vitriol in titanium dioxide production was treated by two-stage neutralization with limestone. A lot of white gypsum was produced in first stage neutralization with pH value of 1.5. The precipitation rate of scandium rised with increase of end-point pH value, temperature and ageing time in second stage neutralization. The precipitation rate of scandium is 95% under the optimal conditions of second stage neutralization including end-point pH value of 5.0, temperature of 60 ℃, and ageing time of 1.5 h. The main phase of second stage slag is CaSO4?2H2O. Presented as translucent and gelatinous precipitate with 500 nm in diameter, Sc(OH)3 has characteristics of irregular shape, agglomeration and non-uniform in distribution. |
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