Effect of integration of mechanical ball milling and flue gas desulfurization gypsum on dealkalization of bauxite residue  

机械球磨与烟气脱硫石膏联用对赤泥脱碱的影响

作　　者：Feng ZHU Xu-yao GUO Jun JIANG Kai-bin CHEN Xuan-zhi ZHU Dan-dan DENG Yu-jun WU Yu-wei HUANG Sheng-guo XUE 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(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)

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,China [2]Zhengzhou Non-ferrous Metals Research Institute Co.,Ltd.of CHALCO,Zhengzhou 450041,China [3]College of Environment and Resources,Xiangtan University,Xiangtan 411105,China [4]School of Resources and Safety Engineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第8期2702-2713,共12页中国有色金属学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.42177391,42077379);the Natural Science Foundation of Hunan Province,China(No.2022JJ20060);the Central South University Innovation-driven Research Program,China(No.2023CXQD065);the Fundamental Research Funds for the Central Universities of Central South University,China(No.2023ZZTS0800).

摘　　要：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 Na_(2)O 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.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Na_(2)O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。

关 键 词：bauxite residue alkalinity regulation flue gas desulfurization gypsum mechanical activation soil formation of bauxite residue 

分 类 号：X758[环境科学与工程—环境工程]