Interaction of sulfuric acid with dolomite (104) surface and its impact on the adsorption of oleate anion: a DFT study

• Autorzy: Cao Qinbo , Zou Heng , Chen Xiumin , Yu Xingcai

Identyfikatory

DOI

10.5277/ppmp19070

• Języki publikacji: EN

Abstrakty

EN

Sulfuric acid (H2SO4) is a specific depressor for apatite rather than for dolomite. The H2SO4treated dolomite can still be floated effectively by oleate. However, the role of H2SO4 in the adsorption of oleate onto dolomite surface remains unclear. In this work, density functional theory calculations were conducted to probe the interactions among sulfate anion (SO4²⁻), oleate anion and the dolomite surface. The adsorption behaviors of SO4²⁻ anion onto the perfect and CO3-defect dolomite surfaces were compared. Such results show that SO4²⁻anion could only adsorb onto the defective dolomite surface, where it bonded with a Ca atom. The remaining Ca and Mg atoms at the defect site could further react with the oleate anion, generating new Ca/Mg–O ionic bond. In this regard, oleate and SO4²⁻anions may both present on the dolomite surface. This phenomenon accounts for the flotation of H2SO4-treated dolomite.

Słowa kluczowe

EN

dolomite; adsorption; oleate; depressor; density functional theory

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2020
• Tom: Vol. 56, iss. 1
• Strony: 34--42
• Opis fizyczny: Bibliogr. 34 poz., rys., tab.

Twórcy

autor

Cao Qinbo

• Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, PR China
• State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093

autor

Zou Heng

• Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, PR China

autor

Chen Xiumin

• Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, PR China
• State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093

autor

Yu Xingcai

• State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).