- Tytuł:
- 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 - Powiązania:
- https://bibliotekanauki.pl/articles/1449558.pdf
- Data publikacji:
- 2020
- Wydawca:
- Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
- Tematy:
-
dolomite
adsorption
oleate
depressor
density functional theory - Opis:
- Sulfuric acid $(H_2SO_4)$ is a specific depressor for apatite rather than for dolomite. The $H_2SO_4$ treated dolomite can still be floated effectively by oleate. However, the role of $H_2SO_4$ 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 ($SO_4^{2−}$), oleate anion and the dolomite surface. The adsorption behaviors of $SO_4^{2−}$ anion onto the perfect and $CO_3$-defect dolomite surfaces were compared. Such results show that $SO_4^{2−}$ 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 $SO_4^{2−}$ anions may both present on the dolomite surface. This phenomenon accounts for the flotation of $H_2SO_{4-}$treated dolomite.
- Źródło:
-
Physicochemical Problems of Mineral Processing; 2020, 56, 1; 34-42
1643-1049
2084-4735 - Pojawia się w:
- Physicochemical Problems of Mineral Processing
- Dostawca treści:
- Biblioteka Nauki
Artykuł