Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111235
Title: Mechanism and Kinetics of Iron Extraction from High Silica Boehmite–Kaolinite Bauxite by Hydrochloric Acid Leaching
Authors: Valeev, D.
Pankratov, D.
Shoppert, A.
Sokolov, A.
Kasikov, A.
Mikhailova, A.
Salazar-Concha, C.
Rodionov, I.
Issue Date: 2021
Publisher: Nonferrous Metals Society of China
Elsevier BV
Citation: Mechanism and Kinetics of Iron Extraction from High Silica Boehmite–Kaolinite Bauxite by Hydrochloric Acid Leaching / D. Valeev, D. Pankratov, A. Shoppert et al. // Transactions of Nonferrous Metals Society of China (English Edition). — 2021. — Vol. 31. — Iss. 10. — P. 3128-3149.
Abstract: The chemical and mineral compositions of bauxite recovered from the Severoonezhsk Bauxite Mine (Arkhangelsk region, Russia) were studied by XRD, ICP-OES, TG/DSC, SEM, TEM, and Mössbauer spectroscopy. The iron-containing minerals of the bauxites were found to comprise alumogoethite (α-Fe1–xAlxOOH), alumohematite (α-(Fe1–xAlx)2O3), alumoakaganeite (β-Fe1–xAlxO(OH,Cl)), and chromite (FeCr2O4). The efficiency of Fe extraction from the bauxite by HCl leaching was 82.5% at 100 °C, HCl concentration of 10%, solid/liquid ratio of 1:10, and the process duration of 60 min, with aluminum loss from the bauxites below 4.5% of the total Al contents in the bauxite. Analysis of the kinetics of the iron leaching process proved diffusion to be the limiting stage of the process at 90–100 °C. Bauxite residue after leaching presented traces of α-Fe1–xAlxOOH and β-Fe1–xAlxO(OH,Cl), and most of the iron content was in the FeCr2O4. In bauxite residue after HCl leaching, in addition to iron oxide, the contents of chromium and calcium oxides significantly decreased. The iron chloride liquor after leaching contained the rare earth elements (REE) of 6.8 mg/L Sc, 4.1 mg/L Ce and 2.3 mg/L Ga. © 2021 The Nonferrous Metals Society of China.
Keywords: ACID LEACHING
BAUXITE
IRON EXTRACTION
KINETICS
MÖSSBAUER SPECTROSCOPY
ALUMINUM
CHLORINE COMPOUNDS
CHROMIUM
CHROMIUM COMPOUNDS
CORUNDUM
EXTRACTION
IRON OXIDES
KAOLINITE
LEACHING
LIME
RARE EARTHS
SILICA
ACID LEACHING
ARKHANGELSK
BAUXITE RESIDUE
CHEMICAL COMPOSITIONS
HIGH SILICAS
HYDROCHLORIC ACID LEACHING
MECHANISM AND KINETICS
MINERAL COMPOSITION
URI: http://hdl.handle.net/10995/111235
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85119978882
PURE ID: 28960009
ISSN: 1003-6326
metadata.dc.description.sponsorship: This research was funded by a Ministry of Science and Higher Education of the Russian Federation (scientific topic No. 0137-2019-0023). The authors would like to appreciate the assists from The Center for Collective Use Testing Analytical Center of the JSC “Scientific-Research Institute of Chemical Technology” and personally to Natalya Ognevskaya for chemical analysis of solid and liquid samples.
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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