Effect of iron minerals on formation of hydroandradite during alkali-thermal process

IF 5.9 3区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of Industrial and Engineering Chemistry Pub Date : 2024-08-12 DOI:10.1016/j.jiec.2024.08.010

Jilong Liu, Xiaolin Pan, Hongfei Wu, Feng Qiu, Haiyan Yu

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Abstract

The hydroandradite (HA) is an efficient and ideal desilication product to deal with the bauxite and red mud based on the alkali-thermal process, while the selection of iron source is crucial for the HA generation. This work investigates the effects of various natural iron minerals on the alkali-thermal formation HA in aluminate solution by comparing with synthetic sodium ferrate. The Gibbs free energy changes of HA formation with different iron oxides were calculated based on the complex silicate theory, and the preferential conversion order for HA formation was obtained thermodynamically. The solubility data of various iron minerals in aluminate solution were determined and correlated by the Apelblat model. The contribution order of iron minerals for HA formation was obtained, and the goethite is the best alternative to replace sodium ferrite by comparing to hematite and magnetite. The phase transformation of HA is above 80% in the presence of goethite, and the alkali content in reaction product is as low as 0.20%. Moreover, the effect mechanism of goethite on HA formation was discussed and established.

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铁矿物对碱热过程中水云母形成的影响

氢烛石（HA）是基于碱热法处理铝土矿和赤泥的一种高效、理想的脱硅产品，而铁源的选择对氢烛石的生成至关重要。本研究通过与合成铁酸钠进行比较，研究了各种天然铁矿物对铝酸盐溶液中碱热法生成 HA 的影响。根据复合硅酸盐理论计算了不同氧化铁形成 HA 的吉布斯自由能变化，并从热力学角度得出了 HA 形成的优先转化顺序。确定了各种铁矿物在铝酸盐溶液中的溶解度数据，并通过阿佩尔布拉特模型进行了相关分析。得出了铁矿物对 HA 形成的贡献顺序，与赤铁矿和磁铁矿相比，鹅铁矿是替代钠铁矿的最佳选择。在鹅铁矿存在的情况下，HA 的相变率在 80% 以上，反应产物中的碱含量低至 0.20%。此外，还讨论并确定了鹅铁矿对 HA 形成的影响机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Industrial and Engineering Chemistry 工程技术-工程：化工

CiteScore

10.40

自引率

6.60%

发文量

639

审稿时长

29 days

期刊介绍： Journal of Industrial and Engineering Chemistry is published monthly in English by the Korean Society of Industrial and Engineering Chemistry. JIEC brings together multidisciplinary interests in one journal and is to disseminate information on all aspects of research and development in industrial and engineering chemistry. Contributions in the form of research articles, short communications, notes and reviews are considered for publication. The editors welcome original contributions that have not been and are not to be published elsewhere. Instruction to authors and a manuscript submissions form are printed at the end of each issue. Bulk reprints of individual articles can be ordered. This publication is partially supported by Korea Research Foundation and the Korean Federation of Science and Technology Societies.