Laboratory Methods for Metal Recovery from Red Mud: Extraction Strategies and Technological Insights : научное издание

Druzhinin Konstantin E.; Vasyunina N.V.; Dubova I.V.; Gilmanshina T.R.; Bazhenova T.P.

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База данных: Каталог библиотеки СФУ

Библиографическое описание: Laboratory Methods for Metal Recovery from Red Mud: Extraction Strategies and Technological Insights : научное издание / Konstantin E. Druzhinin, N. V. Vasyunina, I. V. Dubova [и др.]. - Текст : непосредственный // Metallurgical and Materials Data. - 2025. - Т. 3, № 1. - С. 6-10. - ISSN 2956-1787. - ISSN 2956-1795, DOI 10.30544/mmd48.

Аннотация: Red mud, the highly alkaline residue of the Bayer process, is generated at about 120 million t yr⁻¹ and represents both an environmental liability and a secondary resource. This study had two objectives: (i) to synthesize evidence from 162 publications on recovery routes for Fe, Al, Na, and Ti, and (ii) to demonstrate two laboratory-scale applications on a representative residue. Methods included a combined pyrometallurgical–hydrometallurgical flowsheet—carbothermic reduction smelting at 1450–1500 °C with fluxes, followed by sintering–leaching of the resulting slag—and a materials route in which red mud served as a filler in release coatings for metal molds. In smelting tests at 1450 °C, iron extraction to the metallic phase reached 88.5–91.5%, producing cast iron with 93.8 wt% Fe and 4.99 wt% C, and slags with ≤ 0.2 wt% Fe. From this Fe-depleted slag, alumina recovery by the sintering route was 69.8%, with reagent consumptions of ~309 kg Na₂CO₃, 300 kg CaO, and 282 kg NaOH per tonne of slag; sodium partitioned predominantly to sublimates and dust, indicating the need for alkali capture and recycle. In the coating application, incorporating up to 10 wt% red mud delivered densities of ~1016–1123 kg m⁻³, nominal viscosities of ~10–11 mPa·s, and ~96% sedimentation stability; higher loadings reduced stability. We conclude that integrated, site-specific flowsheets can simultaneously valorize metal values (iron to saleable metal; alumina from slag) and support direct materials uses, while scale-up success will depend on alkali management, reagent and energy intensity, and standardized performance testing. The results align with pilot-scale experience and suggest a credible pathway from laboratory data to industrial implementation.

Год издания: 2025

Авторы: Druzhinin Konstantin E., Vasyunina N.V., Dubova I.V., Gilmanshina T.R., Bazhenova T.P.

Издательство: Association of Metallurgical Engineers of Serbia

Источник: Metallurgical and Materials Data

Выпуск: Т. 3, № 1

Номера страниц: 6-10

Количество экземпляров:

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