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Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal

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Laboratory of Physical Chemistry and Technology of Iron Ore Processing, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky Prosp., 119334 Moscow, Russia
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Faculty of Biotechnology and Industrial Ecology, D. Mendeleev University of Chemical Technology of Russia, 9 Miusskaya Square, 125047 Moscow, Russia
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Laboratory of Complex Chemical Research, N.P. Lyakishev Scientific Center for Complex Processing of Raw Materials, I. P. Bardin Central Research Institute of Ferrous Metallurgy, 23/9 bdg. 2, Radio Str., 105005 Moscow, Russia
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Department of Energy-Efficient and Resource-Saving Industrial Technologies, National University of Science & Technology (MISIS), 4 Leninsky Prosp., 119049 Moscow, Russia
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Author to whom correspondence should be addressed.
Academic Editors: Fernando Castro and Anna Kaksonen
Metals 2021, 11(3), 469; https://doi.org/10.3390/met11030469
Received: 30 January 2021 / Revised: 16 February 2021 / Accepted: 8 March 2021 / Published: 12 March 2021
(This article belongs to the Section Extractive Metallurgy)
Red mud is a hazardous waste of the alumina industry that contains high amounts of iron, aluminum, titanium and rare-earth elements (REEs). One of the promising methods for the extraction of iron from red mud is carbothermic reduction with the addition of sodium salts. This research focuses on the process of hydrochloric high-pressure acid leaching using 10 to 20% HCl of two samples of non-magnetic tailings obtained by 60 min carbothermic roasting of red mud at 1300 °C and the mixture of 84.6 wt.% of red mud and 15.4 wt.% Na2SO4 at 1150 °C, respectively, with subsequent magnetic separation of metallic iron. The influence of temperature, leaching duration, solid-to-liquid-ratio and acid concentration on the dissolution behavior of Al, Ti, Mg, Ca, Si, Fe, Na, La, Ce, Pr, Nd, Sc, Zr was studied. Based on the investigation of the obtained residues, a mechanism for passing valuable elements into the solution was proposed. It has shown that 90% Al, 91% Sc and above 80% of other REEs can be dissolved under optimal conditions; Ti can be extracted into the solution or the residue depending on the leaching temperature and acid concentration. Based on the research results, novel flowsheets for red mud treatment were developed. View Full-Text
Keywords: red mud; bauxite residue; reduction roasting; sodium sulfate; magnetic separation; alumina; high pressure acid leaching; hydrochloric acid; recycling; utilization red mud; bauxite residue; reduction roasting; sodium sulfate; magnetic separation; alumina; high pressure acid leaching; hydrochloric acid; recycling; utilization
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MDPI and ACS Style

Zinoveev, D.; Grudinsky, P.; Zhiltsova, E.; Grigoreva, D.; Volkov, A.; Dyubanov, V.; Petelin, A. Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal. Metals 2021, 11, 469. https://doi.org/10.3390/met11030469

AMA Style

Zinoveev D, Grudinsky P, Zhiltsova E, Grigoreva D, Volkov A, Dyubanov V, Petelin A. Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal. Metals. 2021; 11(3):469. https://doi.org/10.3390/met11030469

Chicago/Turabian Style

Zinoveev, Dmitry, Pavel Grudinsky, Ekaterina Zhiltsova, Darya Grigoreva, Anton Volkov, Valery Dyubanov, and Alexander Petelin. 2021. "Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal" Metals 11, no. 3: 469. https://doi.org/10.3390/met11030469

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