Effect of inorganic anions on precipitation of desilication products based on low-temperature Bayer process

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

Transactions of Nonferrous Metals Society of China Pub Date : 2024-04-01 DOI:10.1016/S1003-6326(24)66472-1

Ji-long LIU , Xiao-lin PAN , Hong-fei WU , Xian-lin HOU , Hai-yan YU

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Abstract

The effect of inorganic anion impurities in sodium aluminate solution on the composition, structure and micro-morphology of desilication products (DSPs) based on the low-temperature Bayer process was systematically investigated via XRD, FT-IR, SEM and PSD methods. The sodalites with chloride-type, carbonate-type and nosean-type precipitate in the presence of chloride, sulfate and carbonate in solution, and the aluminate ions in DSPs are partly replaced by the incorporation of anion impurities. The binding capability of sulfate to the DSPs cage is stronger than aluminate, chloride and carbonate. The particle size, agglomeration degree and thickness of the circular lamellar structure of DSPs are increased by rising the concentration of anion impurities. The anions enhance the dissolution of the zeolite framework and the formation of tetradentate rings in sodalite, which promotes the transformation of zeolite to sodalite.

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无机阴离子对基于低温拜耳工艺的脱盐产品沉淀的影响

通过 XRD、FT-IR、SEM 和 PSD 方法，系统研究了铝酸钠溶液中无机阴离子杂质对基于低温拜耳工艺的脱硅产品（DSPs）的组成、结构和微观形态的影响。在溶液中存在氯化物、硫酸盐和碳酸盐时，会析出氯化物型、碳酸盐型和诺桑型钠长石，DSP 中的铝酸根离子部分被阴离子杂质取代。硫酸盐与 DSPs 笼的结合能力强于铝酸盐、氯酸盐和碳酸盐。随着阴离子杂质浓度的增加，DSP 的粒度、团聚度和环片状结构的厚度也会增加。阴离子增强了沸石框架的溶解和钠长石中四价环的形成，从而促进了沸石向钠长石的转化。

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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.