A selective hydrometallurgical method for scandium recovery from a real red mud leachate: A comparative study.

Autor: Salman AD; Sustainability Solutions Research Lab, University of Pannonia, Veszprém, Hungary; Department of Chemical and Petroleum Refining Engineering, College of Oil and Gas Engineering, Basra University, Iraq., Juzsakova T; Sustainability Solutions Research Lab, University of Pannonia, Veszprém, Hungary., Jalhoom MG; Department of Production Engineering and Minerals, University of Technology Baghdad-Iraq, Iraq., Abdullah TA; Sustainability Solutions Research Lab, University of Pannonia, Veszprém, Hungary; Chemistry Branch, Applied Sciences Department, University of Technology, Baghdad, Iraq., Le PC; The University of Danang-University of Science and Technology, 54 Nguyen Luong Bang, Danang, 550000, Viet Nam., Viktor S; Sustainability Solutions Research Lab, University of Pannonia, Veszprém, Hungary., Domokos E; Sustainability Solutions Research Lab, University of Pannonia, Veszprém, Hungary., Nguyen XC; Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam; Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang, 550000, Viet Nam., La DD; Institute of Chemistry and Materials, Nghia Do, Cau Giay, Ha Noi City, Viet Nam., Nadda AK; Department of Biotechnology and Bioinformatics, Jaypee University of Information Technology, Waknaghat, Solan, Himachal Pradesh, 173 234, India., Nguyen DD; Department of Environmental Energy Engineering, Kyonggi University, South Korea; Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, 300A Nguyen Tat Thanh, District 4, HCM City, 755414, Viet Nam. Electronic address: nguyensyduc@gmail.com.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2022 Sep 01; Vol. 308, pp. 119596. Date of Electronic Publication: 2022 Jun 15.
DOI: 10.1016/j.envpol.2022.119596
Abstrakt: The aim of this study was to recover Sc as the main product and Fe as a by-product from Hungarian bauxite residue/red mud (RM) waste material by solvent extraction (SX). Moreover, a new technique was developed for the selective separation of Sc and Fe from real RM leachates. The presence of high Fe content (∼38%) in RM makes it difficult to recover Sc because of the similarity of their physicochemical properties. Pyrometallurgical and hydrometallurgical methods were applied to remove the Fe prior to SX. Two protocols based on organophosphorus compounds (OPCs) were proposed, and the main extractants were evaluated: bis(2-ethylhexyl) phosphoric acid (D2EHPA/P204) and tributyl phosphate (TBP). The results showed that SX using diethyl ether and tri-n-octylamine (N 235 ) was efficient in extracting Fe(III) from the HCl leachate as HFeC1 4 . Over 97% of Sc was extracted by D2EHPA extractant under the following conditions; 0.05 mol/L of D2EHPA concentration, A/O phase ratio of 3:1, pH 0-1, 10 min of shaking time, and a temperature of 25 °C. Sc(OH) 3 as a precipitate was efficiently obtained by stripping from the D2EHPA organic phase by 2.5 mol/L of NaOH with a stripping efficiency of 95%. In the TBP system, 99% of Sc was extracted under the following conditions: 12.5% vol of TBP, an A/O phase ratio of 3:1, 10 min of shaking time, and a temperature of 25 °C. The Sc contained in the TBP organic phase could be efficiently stripped by 1 mol/L of HCl with a stripping efficiency of 92.85%.
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Databáze: MEDLINE
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