Alumina Extraction from Kaolinite via Calcification-Carbonation Process,Russian Journal of Non-Ferrous Metals

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Alumina Extraction from Kaolinite via Calcification-Carbonation Process
Russian Journal of Non-Ferrous Metals ( IF 0.8 ) Pub Date : 2020-07-06 , DOI: 10.3103/s1067821220030207
Zimu Zhang , Guozhi Lu , Yongchao Chen , Tingan Zhang , Xi Chao , Yang Chen , Yanxiu Wang , Yan Liu

Abstract

The rapid development of the alumina industry in China has led to the depletion of high-quality bauxite resources. The proposed calcification-carbonation method (CCM) can convert the middle silicon of bauxite into CaO · SiO₂ and CaCO₃, thus enabling clean and efficient utilization of low-grade resources. Since kaolinite is the main silicon-bearing mineral in low-grade bauxite, the transformation characteristics of kaolinite in the CCM process are investigated in this research. The experimental results indicate that temperature has a significant effect on both the calcification process and the carbonation process. The theoretical alumina-to-silica ratio (A/S) in the reacted residue can be lowered to 0.55 using the CCM process used to treat gibbsite, resulting in a recovery ratio of alumina approximately 15% greater than that of the Bayer process. More than 65% of the alumina can be recovered through the CCM. The Na₂O content in the slag from the CCM meets the requirements of the cement industry, and cleaner production of alumina can be enabled by the CCM.

更新日期：2020-07-06

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