Dissociation Behavior of Al-Fe in the “Calcification-Carbonization” Process for High-Iron Bauxite

doi:10.12068/j.issn.1005-3026.2018.03.010

Abstract

Abstract: Aiming at dissociation problem of Al-Fe in hydrometallurgical extraction process for high-iron diaspore bauxite， “calcification-carbonization-reducing iron” method was proposed for effectively extracting valuable metal Al and Fe. Andradite-grossular hydrogarnet was synthetized by pure material， and the transformation behavior in novel technology was investigated for effective dissociation and comprehensive recovery of Al-Fe from high-iron bauxite. The results showed that the andradite-grossular hydrogarnet is synthetized in the range of 483~533K in Na₂O-Al₂O₃-CaO-SiO₂-Fe₂O₃-H₂O system， in which chemical property is relatively stable. In the carbonization process， andradite-grossular hydrogarnet is decomposed entirely， producing CaCO₃， Ca₂SiO₄， Fe₂O₃ and a little grossular hydrogarnet. Moreover， 52.7% of Al₂O₃ is extracted in dissolving alumina process and 77.2% of Fe is reduced in the directly reducing iron process.

Key words: calcification-carbonization method, high-iron diaspore bauxite, andradite-grossular hydrogarnet, Al-Fe dissociation, dissolving alumina

CLC Number:

TF821

ZHANG Wei-guang， ZHANG Ting-an， LYU Guo-zhi， GUO Fang-fang. Dissociation Behavior of Al-Fe in the “Calcification-Carbonization” Process for High-Iron Bauxite[J]. Journal of Northeastern University Natural Science, 2018, 39(3): 351-356.

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