Investigations into the flotation of molybdenite in the presence of chalcopyrite using (3S,4S,5S,6R)-3,4,5,6-tetrahydroxyoxane-2-carboxylate acid as a novel selective depressant: An experimental and theoretical perspective

Mweene, L and Prasad Khanal, G and Kawala, J and Subramanian, S (2022) Investigations into the flotation of molybdenite in the presence of chalcopyrite using (3S,4S,5S,6R)-3,4,5,6-tetrahydroxyoxane-2-carboxylate acid as a novel selective depressant: An experimental and theoretical perspective. In: Journal of Molecular Liquids, 368 .

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Abstract

(3S,4S,5S,6R)-3,4,5,6-tetrahydroxyoxane-2-carboxylate (TTC) acid was experimentally and theoretically investigated as a chalcopyrite (CPY) depressant during molybdenite-chalcopyrite (MLT-CPY) beneficiation. It was observed that the adsorption of TTC onto CPY was more than that onto MLT. The zero-point corrected complexation energies for complexes on mineral surfaces was calculated by using M06-2X/6–311++g(d,p)/def2-TZVPP level of theory in gas phase. It was established that Mo(OH)4-∙∙∙FeOH+∙∙∙TTC (S = 1) and FeOH+∙∙∙TTC (S = 0) complexes on MLT and CPY, respectively, of complexation energies of −189.0 kJ/mol and −831.0 kJ/mol, respectively, were the most stable complexes. The analyzed nature of bonding in complexes using Non-Covalent Interaction and Quantum Theory of Atoms in Molecules (QTAIM) suggested that the complexes were governed by traditional hydrogen bonding, as well as covalent, and other non-covalent interactions. Flotation tests carried out using a synthetic mixture of MLT and CPY (1:1) at pH 5.4 ± 0.1 1 in the presence an economical TTC depressant yielded a grade, recovery and separation efficiency of 58.7 %, > 97.6 % and 88.8 %, respectively. Therefore, TTC could be used as a potential depressant of CPY during the flotation of MLT.

Item Type:	Journal Article
Publication:	Journal of Molecular Liquids
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Complexation; Copper compounds; Hydrogen bonds; Iron compounds; Molybdenum compounds; Quantum theory, Bonding; Complexation energy; Electro-kinetics; Flotation tests; Gas-phases; Mineral surfaces; Non-covalent interaction; Quantum Theory of Atoms in Molecules; Stable complexes; Zero-point, Flotation
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Dec 2022 10:46
Last Modified:	29 Dec 2022 10:46
URI:	https://eprints.iisc.ac.in/id/eprint/78616

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