Alumina Production from Calcium Aluminate Slags with a Novel HCl-Based Metallurgical Process.

IF 3.2 3区材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Journal of Sustainable Metallurgy Pub Date : 2025-01-01 Epub Date: 2025-05-08 DOI:10.1007/s40831-025-01100-8

Maria Bagani, Amalia Bempelou, Michail Vafeias, Danai Marinos, Anastasia Pilichou, Dimitrios Kotsanis, Dimitrios Sparis, Efthymios Balomenos, Dimitrios Panias

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Abstract

A novel, HCl-based metallurgical process is investigated aiming at the production of α-Al₂O₃ from calcium aluminate slags. The process includes the following stages: (a) leaching of the slag with aqueous HCl to dissolve the aluminum content and separate SiO₂ as a filterable precipitate, (b) HCl_(g) purging precipitation of the dissolved aluminum in the form of aluminum chloride hexahydrate salt (AlCl₃∙6H₂O, ACH), (c) partial removal of dissolved metal impurities from the impure ACH by acetone washing and (d) calcination of the higher purity ACH to produce α-Al₂O₃. Under optimum leaching conditions, approximately 90% of aluminum is successfully extracted. An ACH purity of 97.5% was achieved after the precipitation and purification process. After calcination of the ACH, α-Al₂O₃ of 98.5% purity was produced.

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Abstract Image

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以铝酸钙渣为原料生产氧化铝的hcl基冶金新工艺。

研究了一种以铝酸钙渣为原料制备α-Al2O3的新型盐酸冶金工艺。该工艺包括以下几个阶段：(a)用HCl水溶液浸出渣以溶解铝含量并分离SiO2作为可过滤沉淀物；(b) HCl(g)以六水氯化铝盐（AlCl3∙6H2O， ACH）的形式吹扫沉淀溶解铝；(c)丙酮洗涤除去不纯ACH中的部分溶解金属杂质；(d)煅烧高纯度ACH生成α-Al2O3。在最佳浸出条件下，约90%的铝被成功浸出。经沉淀纯化，乙酰胆碱的纯度为97.5%。ACH煅烧后可制得纯度为98.5%的α-Al2O3。图形化的简介:

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来源期刊

Journal of Sustainable Metallurgy Materials Science-Metals and Alloys

CiteScore

4.00

自引率

12.50%

发文量

151

期刊介绍： Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.