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

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-08-01 DOI:10.1016/S1003-6326(24)66570-2

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

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Abstract

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.

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机械球磨和烟气脱硫石膏一体化对铝土矿残渣脱碱的影响

通过对溶液化学、矿物学和微观形貌的综合分析，研究了机械球磨和烟气脱硫（FGD）石膏对铝土矿残渣脱碱的协同影响。结果表明，经过 30 分钟的机械球磨后，烟气脱硫石膏处理过的铝土矿渣中的 Na2O 含量明显降低（30 wt.%）。机械球磨使铝土矿渣中的元素分布发生了分化，改变了矿物的晶体结构，促进了碱性矿物的溶解，从而提高了铝土矿渣的酸中和能力。5 wt.% 烟气脱硫石膏与 30 分钟机械球磨相结合是铝土矿渣脱碱的最佳方法。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.