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| Effects of K+ on Reaction Behaviors of Potassium-bearing Bauxite during Bayer Digestion Process |
| Received:March 29, 2021 Revised:April 07, 2021 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.07.004 |
| KeyWord:K+; potassium-bearing bauxite; Bayer; digestion; reaction behaviors |
| Author | Institution |
| WU Guo-bao |
中铝郑州有色金属研究院有限公司 |
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| Abstract: |
| Experiments on Bayer digestion of potassium-bearing bauxite and solution desilication with different concentration of K+ in caustic sodium aluminate solution were carried out. The results show that, in range of 30.19~301.94 g/L, variation of concentration of K+ in caustic sodium aluminate liquor has less effect on extraction efficiency of alumina and N/S of red mud. Entering of K element into liquor cannot be prevented entirely during Bayer digestion process, even apparent extraction efficiency of K2O contained in bauxite can be reduced remarkably with increasing of K+ concentration in caustic sodium aluminate liquor. It is difficult for K+ to replace Na+ and enter into crystal lattice of sodium aluminosilicate hydrate as K+ concentration in solution is not higher than 155.28 g/L, and equilibrium concentration of K+ in plant solution would be much higher than current level. Technological measures for potassium removal should be taken to control increasing concentration of K+ effectively in plant production system. |
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