New insights into pyrite-hydrogen peroxide interactions during froth flotation : experimental and DFT study

• Autorzy: Cao Qinbo , Yan Wenchao , Wen Shuming , Liu Dianwen , Li Yanjun

Identyfikatory

DOI

10.37190/ppmp/157409

• Języki publikacji: EN

Abstrakty

EN

Hydrogen peroxide (H₂O₂) is an efficient depressant for pyrite (FeS₂) flotation. However, the depressing mechanism of H₂O₂ is not fully understood. In this paper, the depressing capacity of H₂O₂ for pyrite was examined by flotation tests. Results revealed that pyrite flotation could be inhibited by H₂O₂ at pH 6.4. The pyrite powder in H₂O₂ solution enhanced the release of O₂ from H₂O₂. However, the O₂ concentration in the solution was less than that of H₂O₂; thus, H₂O₂ is the major oxidant in the solution. Moreover, density functional theory calculations were performed to study the interactions between H₂O₂ and hydrated pyrite (100) surface. The H₂O₂ molecule tended to react with the pyrite surface to generate one S=O bond and an H₂O molecule. The possible binding models of O₂ molecules on the pyrite (100) surface were also studied for comparison. The O₂ dissociation on the pyrite surface was more favorable than the adsorption of O₂ as a whole. In addition, the orbital interaction in the S=O bond raised from the reaction of H₂O₂/O₂ with the pyrite surface was also investigated by the density states analysis. These results provide some insights into the oxidizing effect of H₂O₂ in pyrite flotation.

Słowa kluczowe

EN

hydrogen peroxide; oxidization; pyrite flotation; adsorption model; DFT

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2023
• Tom: Vol. 59, iss. 1
• Strony: art. no. 157409
• Opis fizyczny: Bibliogr. 39 poz., rys., tab., wykr.

Twórcy

autor

Cao Qinbo

• Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
• State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization，Kunming 650093, China
• Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources, China

• https://orcid.org/0000-0002-8175-7595

autor

Yan Wenchao

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

autor

Wen Shuming

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

autor

Liu Dianwen

• Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
• Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources, China

autor

Li Yanjun

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

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Uwagi

Financial support from the Analysis and Testing Foundation of Kunming University of Science and Technology (PR China), National Natural Science Foundation of China (22068020), and the Yong Top-notch Talent Project of Yunnan Ten Thousand Talent Plan (Yunnan Province, PR China) is gratefully acknowledged.