Effects of gypsum amendment on salinity ion migration in bauxite residue

doi:10.7523/j.issn.2095-6134.2019.04.011

Abstract

Abstract: Bauxite residue is an alkaline waste byproduct generated by the extraction of alumina from bauxite, with strong alkalinity and high salinity. Disposal of bauxite residue (red mud) became an increasing concern to the sustainable development of the alumina industry. A leaching column experiment was conducted to study the effects of different treatments (G0:no gypsum, G2:2% gypsum, G4:4% gypsum) on migration and distribution of salt in bauxite residue. The results are given as follows. Compared with the control group, gypsum led to increases of the initial permeation rate, the stable permeability rate, and average permeation in water leaching by 31%-36%,16%-33%, and 9.3%-35%, respectively. The pH ranges of G0, G2, and G4 in water leaching are 8.3-9.4, 8.8-10.0, and 9.0-9.8, respectively. The EC values of G0, G2, and G4 in water leaching are 1.0-4.0, 5.8-7.2, and 5.2-7.5 mS·cm^-1, respectively. Addition of gypsum in bauxite residue is beneficial to the leaching of Na⁺, K⁺, and CO₃^2-. This study provides a scientific basis for the control and prevention of salinity and the soil formation of bauxite residue.

Key words: bauxite residue, gypsum, soil formation of bauxite residue, salinity ion migration, migration and distribution

CLC Number:

X753

TIAN Tao, WU Yujun, XUE Shengguo, HUANG Ling, JIANG Jun, ZHU Feng. Effects of gypsum amendment on salinity ion migration in bauxite residue[J]. , 2019, 36(4): 521-529.

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