The synergistic impact of mechanical ball milling and flue gas desulfurization(FGD)gypsum on the dealkalization of bauxite residue was investigated through integrated analyses of solution chemistry,mineralogy,and microtopography.The results showed a significant decrease in Na2O content(＞30 wt.％)of FGD gypsum-treated bauxite residue after 30 min of mechanical ball milling.Mechanical ball milling resulted in differentiation of the elemental distribution,modification of the minerals in crystalline structure,and promotion in the dissolution of alkaline minerals,thus enhancing the acid neutralization capacity of bauxite residue.5 wt.％FGD gypsum combined with 30 min mechanical ball milling was optimal for the dealkalization of bauxite residue.
关键词
赤泥/碱性调控/烟气脱硫石膏/机械活化/赤泥土壤化
Key words
bauxite residue/alkalinity regulation/flue gas desulfurization gypsum/mechanical activation/soil formation of bauxite residue
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基金项目
National Natural Science Foundation of China(42177391)
National Natural Science Foundation of China(42077379)
Natural Science Foundation of Hunan Province,China(2022JJ20060)
Central South University Innovationdriven Research Program,China(2023CXQD065)
Fundamental Research Funds for the Central Universities of Central South University,China(2023ZZTS0800)
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