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机械球磨与烟气脱硫石膏联用对赤泥脱碱的影响

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结合溶液化学、矿物学和微观形貌分析,研究机械球磨和烟气脱硫石膏联用对赤泥碱性调控的影响.结果表明,经机械球磨30 min后用烟气脱硫石膏处理的赤泥中Na2O含量降低了 30％(质量分数)以上;机械球磨改变了赤泥矿物表面元素分布和晶型结构,促进了赤泥碱性矿物的溶解,从而提高了脱碱后赤泥的酸中和能力.5％(质量分数)烟气脱硫石膏和30 min球磨时间可实现赤泥脱碱.
Effect of integration ofmechanical ball milling and flue gas desulfurization gypsum on dealkalization of bauxite residue
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.

bauxite residuealkalinity regulationflue gas desulfurization gypsummechanical activationsoil formation of bauxite residue

朱锋、郭旭耀、江钧、陈开斌、朱轩郅、邓丹丹、吴玉俊、黄昱伟、薛生国

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中南大学冶金与环境学院,长沙 410083

中铝郑州有色金属研究院有限公司,郑州 450041

湘潭大学环境与资源学院,湘潭 411105

中南大学资源与安全工程学院,长沙 410083

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赤泥 碱性调控 烟气脱硫石膏 机械活化 赤泥土壤化

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Hunan Province,ChinaCentral South University Innovationdriven Research Program,ChinaFundamental Research Funds for the Central Universities of Central South University,China

42177391420773792022JJ200602023CXQD0652023ZZTS0800

2024

10.1016/S1003-6326(24)66570-2

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(8)