Variation of alkaline characteristics in bauxite residue under phosphogypsum amendment
磷石膏改良作用下赤泥的碱性变化（英文）作者机构：School of Metallurgy and Environment Central South University Hunan Rare Earth Metal Material Research Institute Institute for Future Environments Science and Engineering Faculty Queensland University of Technology (QUT)
出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)
年 卷 期：2019年第26卷第2期
页 面：361-372页
核心收录：
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学]
基 金：Projects(41877511 41842020)supported by the National Natural Science Foundation of China
主 题：bauxite residue alkaline regulation free alkali phosphogypsum amendment soil formation in bauxite residue
摘 要：Aiming at alkaline problem of bauxite residue,this work focused variation of alkaline characteristics in bauxite residue through phosphogypsum *** results demonstrated that the pH of bauxite residue reduced from initial 10.83 to 8.70 when 1.50 wt%phosphogypsum was added for 91 *** removal rates of free alkali and exchangeable sodium were 97.94%and 75.87%,***,significant positive correlations(POH^–AlO2^–HCO3^–.In addition,alkaline phase decreased from 52.81%to 48.58%and gypsum stably presented in bauxite residue which continuously provided Ca^2+to inhibit dissolution of combined ***,phosphogypsum promoted formation of macroaggregate structure,increased Ca^2+,decreased Na+and Al^3+on the surface of bauxite residue significantly,ultimately promoting soil formation in bauxite residue.
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