通过钙活化脱硫石膏提高铝土矿残渣的脱碱效果

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

Transactions of Nonferrous Metals Society of China Pub Date : 2024-10-01 DOI:10.1016/S1003-6326(24)66617-3

Yu-jun WU , Sheng-guo XUE , Li-ping LIU , Feng LI , Graeme J. MILLAR , Fei GE , Jiang TIAN

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引用次数: 0

摘要

通过控制脱硫石膏中 Ca 的释放，开发了一种去除游离碱并稳定固相碱度的新型综合方法。回收的 FeCl3 溶液与 EDTA 活化的脱硫石膏相结合，可将铝土矿残渣的 pH 值降至 7.20。此外，它还改善了残余 Ca 的状态，使其在总可交换阳离子中所占比例增加（68%-92%）。值得注意的是，通过改性脱硫石膏引入的可交换钙的缓慢释放引起了碱性矿物的相变。这种处理方法通过降低铝土矿渣在缓解 pH 值反弹方面的整体酸中和能力，稳定了铝土矿渣的脱碱效果。因此，这种方法可为有效利用脱硫石膏实现铝土矿渣碱度的稳定调节提供指导。

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Enhanced dealkalization of bauxite residue through calcium-activated desulfurization gypsum

A novel integrated approach to remove the free alkalis and stabilize solid-phase alkalinity by controlling the release of Ca from desulfurization gypsum was developed. The combination of recycled FeCl₃ solution and EDTA activated desulfurization gypsum lowered the bauxite residue pH to 7.20. Moreover, it also improved the residual Ca state, with its contribution to the total exchangeable cations increased (68%−92%). Notably, the slow release of exchangeable Ca introduced through modified desulfurization gypsum induced a phase transition of the alkaline minerals. This treatment stabilized the dealkalization effect of bauxite residue via reducing its overall acid neutralization capacity in abating pH rebound. Hence, this approach can provide guidance for effectively utilizing desulfurization gypsum to achieve stable regulation of alkalinity in bauxite residue.

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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.