Abstract

PENG, J.P. et al. Thermodynamic analysis and experimental studies of magnesium extraction from szaibelyite-suanite ore by aluminium. J. S. Afr. Inst. Min. Metall. [online]. 2016, vol.116, n.12, pp.1165-1170. ISSN 2411-9717.  https://doi.org/10.17159/2411-9717/2016/v116n12a11.

Szaibelyite-suanite type ore is rich in magnesium oxide and boron oxide. We propose a new method to extract both metallic magnesium and valuable residues rich in boron by reduction using metallic aluminium. Thermodynamic analysis of the reactions between aluminum and MgO, MgjB₂O₅, and Μ&Β₂0₆ was carried out. The effects of CaF2 addition, temperature, mass of Al, and pellet formation pressure on the extraction of magnesium were also investigated experimentally. The results indicate that the magnesium oxide phase can be displaced from 2MgO-B₂O₃ and 3MgOB₂O₃ by CaO in the reduction system. The reduction ratio of magnesium oxide was 38% without calcium fluoride addition, increasing to 94% with 5.1% calcium fluoride. The reduction ratio increased with increasing temperature and mass of Al. To obtain a higher reduction ratio, the reduction pellet should be formed under a reasonable pressure

Keywords : szaibelyite-suanite; magnesium; aluminum; thermodynamic analysis.

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