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<p>A novel, HCl-based metallurgical process is investigated aiming at the production of <i>α</i>-Al<sub>2</sub>O<sub>3</sub> 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 SiO<sub>2</sub> as a filterable precipitate, (b) HCl<sub>(<i>g</i>)</sub> purging precipitation of the dissolved aluminum in the form of aluminum chloride hexahydrate salt (AlCl<sub>3</sub>∙6H<sub>2</sub>O, 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 <i>α</i>-Al<sub>2</sub>O<sub>3</sub>. 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, <i>α</i>-Al<sub>2</sub>O<sub>3</sub> of 98.5% purity was produced.</p> Graphical Abstract <p></p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月8日

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

摘要

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.

Graphical Abstract