Effect of substrate amendment on alkaline minerals andaggregate stability in bauxite residue

来源期刊:中南大学学报(英文版)2019年第2期

论文作者:薛生国 田桃 可文舜 朱锋 王琼丽 叶羽真 郭颖

文章页码:393 - 403

Key words:bauxite residue; substrate amendment; alkaline minerals; aggregate stability; soil formation in bauxite residue

Abstract: Bauxite residue is an alkaline waste material in the process of alumina production due to its characteristics of higher salinity and alkalinity, which results in environmental issues and extremely restricts the sustainable development of alumina industries. In this work, we conduct a column experiment to study the effects of two amendments on aggregate stability and variations in alkaline minerals of bauxite residue. The two amendments are phosphogypsum (PG) and phosphogypsum and vermicompost (PVC). The dominant fraction in aggregate is 1–0.25 mm in diameter on the surface, which takes up 39.34%, 39.38%, and 44.51 % for CK, PG, and PVC, respectively. Additions of PG and PVC decreased pH, EC, ESP, exchangeable Na+ concentration and the percentage of alkaline minerals, and then increased exchangeable Ca2+ concentration in bauxite residue. There was significant positive correlation between pH and exchangeable Na+ concentration, the percentage of cancrinite, tricalcium aluminate and calcite; while negative correlation was found in pH value versusexchangeable Ca2+ concentration. Theses findings confirmed that additions of phosphogypsum and vermicompost have a stimulative effect onaggregate stability in bauxite residue. In particular, amendment neutralization (phosphogypsum + vermicompost) in column represents an advantage for large-scale simulation of vegetation rehabilitate in bauxite residue disposal areas.

Cite this article as: TIAN Tao, KE Wen-shun, ZHU Feng, WANG Qiong-li, YE Yu-zhen, GUO Ying, XUE Sheng-guo. Effect of substrate amendment on alkaline minerals and aggregate stability in bauxite residue [J]. Journal of Central South University, 2019, 26(2): 393–403. DOI: https://doi.org/10.1007/s11771-019-4011-0.

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号