Interaction Mechanism of Ferric Ions with Celestite Surface and Implications for Flotation Recovery

Minerals

Yinfei Liao¹  Zilong Ma¹  Yijun Cao¹  Shiming Cao²  Xiaolin Zhang³ 

[1] National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China;School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China;State Key Laboratory of Complex Nonferrous Meal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China;

关键词: celestite;    ferric ions;    adsorption;    flotation;   

DOI  :  10.3390/min9070405

来源: DOAJ

【 摘 要 】

In practical celestite flotation, iron contamination is commonly found on celestite surfaces. The effect of ferric ions on celestite flotation was assessed by a combination of ion release experiments, DFT calculation, X-ray photoelectron spectroscopy (XPS) analysis, adsorption isotherm study, and flotation experiments in this work. The ion release experiments showed that the associated limonite released ferric ions to solution. According to DFT calculation and surface complexation theory, we found that ≡SrOH⁰ and ≡SO₄H⁰ are primary functional groups on celestite surface in aqueous environments. The XPS analysis and adsorption isotherm study revealed that ferric ions mainly adsorbed on celestite surface by complexing with two oxygen atoms of surface ≡SrOH⁰ groups to form ≡Sr−O−Fe−OH precipitates. Flotation results showed that ferric ions strongly depressed celestite flotation. Combined with the change in surface properties determined by XPS, it can be concluded that the adsorption of ferric ions on celestite surface decreased adsorption sites for the collector, and hence, led to depression on celestite flotation.

【 授权许可】

Unknown