Effects of Calcium Oxide on Sintering-Separation of High Iron-Bearing Bauxite

doi:10.12068/j.issn.1005-3026.2015.04.028

Abstract

Abstract: Reduction sintering - magnetic separation process was adopted to deal with high iron-bearing bauxite. The effects of calcium oxide on sintering and Al-Fe separation effect of sintering product were analyzed. Components and microstructure of the reduced sintering product added different dosage of calcium oxide were studied by X-ray diffraction and scanning electron microscope. The results showed that metallization rate of sintering product reached 93.95%， the mass fraction of Fe in the magnetic concentrate was 83.10% and Al₂O₃ leaching rate of rich aluminum slag increased to 61.14% when the mass fraction of calcium oxide is 70%. CaO could completely react with Al₂O₃ and SiO₂ to produce 12CaO·7Al₂O₃ and Ca₂SiO₂， respectively， while Fe element was well reduced to iron which can be well separated from non-ferrous gangues by the magnetic separation.

Key words: high iron-bearing bauxite, calcium oxide, reduction roasting, sinter, magnetic separation

CLC Number:

TD927

YUAN Zhi-tao， FANG Ping， ZHANG Song， LI Li-xia. Effects of Calcium Oxide on Sintering-Separation of High Iron-Bearing Bauxite[J]. Journal of Northeastern University Natural Science, 2015, 36(4): 585-589.

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