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Open AccessArticle

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

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I.P. Bardin Laboratory for Problems of Metallurgy for Complex Ores, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 49, Leninsky Prospect, 119334 Moscow, Russia
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Laboratory of Crystal Structure Studies, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 49, Leninsky Prospect, 119334 Moscow, Russia
*
Author to whom correspondence should be addressed.
Metals 2018, 8(7), 533; https://doi.org/10.3390/met8070533
Received: 13 June 2018 / Revised: 26 June 2018 / Accepted: 29 June 2018 / Published: 10 July 2018
Iron contained in coal fly ash of the Ekibastuz power station is distributed between magnetite and hematite. XRD data showed that ~80 wt % of iron is contained in magnetite and ~20 wt % in hematite. The leaching of iron from CFA by HCl was studied. It was determined that leaching efficiency increased with the increase in hydrochloric acid concentration and temperature. The maximum iron extraction efficiency was 52%. Aluminum is contained in the mullite and was practically not leached. The maximum aluminum extraction efficiency was 3.7%. The kinetics investigation showed that the process of iron leaching was controlled by chemical reaction and diffusion process steps, with an activation energy of 33.25 kJ·mol−1. The aluminum leaching process is controlled by a diffusion process step with an activation energy of 19.89 kJ·mol−1. The reaction order of hydrochloric acid is determined to be 0.9 and 0.23 for iron and aluminum, respectively. View Full-Text
Keywords: coal fly ash; hydrochloric acid; leaching; hematite; magnetite; kinetics coal fly ash; hydrochloric acid; leaching; hematite; magnetite; kinetics
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Valeev, D.; Mikhailova, A.; Atmadzhidi, A. Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching. Metals 2018, 8, 533.

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