A first-principle study of the effect of Fe/Al impurity defects on the surface wettability of dolomite

• Autorzy: Chen Hong , Ao Xianquan , Cao Yang , Li Cuiqin , Jiang Chunyan

Identyfikatory

DOI

10.37190/ppmp/150702

• Języki publikacji: EN

Abstrakty

EN

The presence of Fe and Al atoms in large quantities in phosphate ores can significantly affect the surface properties of the minerals during flotation. In this study, the effects of Fe/Al impurities on the adsorption of H₂O molecules on dolomite, including the density of states (DOS), Mulliken bond group values, and charge groups, were investigated and the adsorption energy was analyzed using density functional theory. The results show that the adsorption of H₂O molecules on perfect and Fe/Al-substituted dolomites is weak chemisorption, and the Fe and Al impurities weaken and enhance the adsorption capacity of H₂O molecules, respectively. Therefore, the hydrophilicity of the dolomite surface increases in the following order: Fe-substituted dolomite < perfect dolomite < Al-substituted dolomite. The Mulliken charge and bond group analysis shows that the adsorption of H₂O molecules on dolomite is primarily through the interaction between Ow and Ca atoms, where the d orbitals of Ca atoms provide charges for Ow atoms to form ionic bonds, which related to the poor electronegativity of Ca atoms and their weak valence electron binding ability. The DOS analysis shows that, during the adsorption of H₂O molecules on dolomite, Mg and Al atoms have less influence on the dolomite surface, whereas Fe and Ca atoms undergo competitive adsorption, which inhibits the interaction between Ca atoms and H₂O molecules on the dolomite surface.

Słowa kluczowe

EN

density functional theory; phosphate rock flotation; dolomite; surface wettability; density of states

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2022
• Tom: Vol. 58, iss. 4
• Strony: art. no. 150702
• Opis fizyczny: Bibliogr. 19 poz., rys., wykr.

Twórcy

autor

Chen Hong

• Faculty of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

autor

Ao Xianquan

• Faculty of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

autor

Cao Yang

• Faculty of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

autor

Li Cuiqin

• Faculty of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

autor

Jiang Chunyan

• Faculty of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).