Effects of ameliorants on aggregate stability of bauxite residue

doi:10.7523/j.issn.2095-6134.2019.04.012

Abstract

Abstract: Bauxite residue is a highly alkaline waste produced during the production of alumina and there is no economical and effective disposal strategy at the present. In this study, gypsum and vermicompost were selected as the ameliorants to investigate their effects on aggregate stability of bauxite residue in the laboratory incubation experiments with different incubation periods. After 60 d incubation, 2% (w/w) gypsum addition reduced the pH from 10.54 to 8.75, whilst 8% (w/w) vermicompost addition increased organic carbon content (TOC) from 3.54 g/kg to 14.31 g/kg. After 180 d incubation, additions of gypsum, vermicompost, and the combination increased the contents of water-stable aggregates from 12.04% to 23.49%, 29.24%, and 33.94%, increased the mean weight diameters (MWD) from 0.15 mm to 0.26, 0.30, and 0.34 mm, and decreased the erodibility factors (K) from 0.36 to 0.31, 0.30, and 0.29, respectively. This study demonstrated that gypsum and vermicompost amendments stimulate water-stable aggregate formation and improve aggregate stability of bauxite residue. Effectiveness of the ameliorants on aggregate stability of bauxite residue decreased in the order:the combination > vermicompost > gypsum. The results provide scientific information for soil formation and large-scale disposal of bauxite residue.

Key words: bauxite residue, substrate amendment, aggregate stability, water stable aggregate, soil formation in bauxite residue

CLC Number:

X753

WANG Qiongli, YE Yuzhen, XUE Shengguo, JIANG Jun, ZHU Feng, TIAN Tao. Effects of ameliorants on aggregate stability of bauxite residue[J]. , 2019, 36(4): 530-536.

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