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| Study on Magnesium Removal in Manganese Sulfate Solution |
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Received:February 29, 2012
Revised:February 29, 2012
Accepted:March 01, 2012
Published Online:July 25, 2012
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| DOI：10.3969/j.issn.1007-7545.2012.08.013 |
| KeyWord:Pitzer model; solubility isotherm; distribution ratio; recrystallization; fluorination; crystal seed; MnSO4 solution; magnesium |
| Author | Institution |
| YANG Chao |
中南大学 化学化工学院 |
| WANG Wen-lei |
中南大学 化学化工学院 |
| ZENG De-wen |
中南大学 化学化工学院 |
| YANG Hai-tang |
中南大学 化学化工学院 |
| CHEN Cong |
中南大学 化学化工学院 |
| CHEN Qi-yuan |
中南大学 化学化工学院 |
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| Abstract: |
| Magnesium impurity was removed by recrystallization and fluoride precipitation in manganese sulfate solution, respectively. The solubility isotherms of binary systems MgSO4-H2O, MnSO4-H2O and ternary system MgSO4-MnSO4-H2O were simulated and predicted with Pitzer thermodynamic model, and the distribution ratio of MgSO4 and MnSO4 in solid phase-liquid phase was verified via recrystallization experiment. Mg was also removed by fluoride precipitation compared with the former. The results show that recrystallization exerts quite limited effect on the separation of Mg and Mn due to constant distribution ratio, and the efficiency is improved by adding MgF2 crystal seed in fluorination. The removal rate of Mg is 94.3% at 95 ℃ with 0.3 g MgF2 and 250% NH4F for 1 h. |
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