Research on the Dealkalization Treatment of Bauxite Residue and Deep Extraction of Alumina.

Yang Chen, Ting-An Zhang, Guozhi Lv, Xi Chao, Xuewei Yang

Bulletin of environmental contamination and toxicology 2022 Jul

filter terms:

Bauxite residue is the bulk solid waste generated by the alumina industry, and the environmental treatment of bauxite residue has always been a focus of attention. In this study, in the high calcium system, the bauxite residue was intensively digestion by the calcification-carbonation method, and the mole ratio of solution, the mass ratio of CaO/SiO2 of the digestion process were changed, so that the high-efficiency dealkalization of bauxite residue was realized and the aluminum oxide in bauxite residue was deeply extracted. The experimental results showed that the calcification process could achieve the recovery of 17.83% alumina at 260°C, reaction duration of 60 min, liquid-solid ratio = 5:1, the mass ratio of CaO/SiO2 = 3.5, and 200 g/L NaOH solution. The whole process can recover 49.61% of alumina from bauxite residue, and 94.4% of alkali in bauxite residue can be removed. © 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Citation

Yang Chen, Ting-An Zhang, Guozhi Lv, Xi Chao, Xuewei Yang. Research on the Dealkalization Treatment of Bauxite Residue and Deep Extraction of Alumina. Bulletin of environmental contamination and toxicology. 2022 Jul;109(1):180-185