Sulfidization regulation of cuprite by pre-oxidation using sodium hypochlorite as an oxidant

International Journal of Mining Science and Technology

卷:31

Qicheng Feng¹  Guang Han²  Shuming Wen²  Han Wang² 

[1] Corresponding author.;

[2] State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;

关键词: Cuprite;    Pre-oxidation;    Enhanced sulfidization;    Xanthate adsorption;   

DOI  :  

来源: DOAJ

【 摘 要 】

The direct sulfidization of cuprite is inefficient because cuprite is a copper-oxide mineral with a strong surface hydrophilicity. In this study, oxidant was used to modify cuprite surfaces to regulate the sulfidization of cuprite. Microflotation tests showed that the flotation recovery of pre-oxidized cuprite was nearly 25% higher than that of direct sulfidization flotation, which indicates that the cuprite surface activity was enhanced after pre-oxidation by Cu(I) species (weak affinity with sulfur ions) transformation to Cu(II) species (strong affinity with sulfur ions). Zeta potential, scanning electron microscopy-energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry results showed that pre-oxidation improved cuprite sulfidization and promoted the formation of copper-sulfide species on the cuprite surfaces. The mineral surface stability and thus, xanthate species adsorption on the cuprite surfaces were improved. The surface-adsorption measurements and infrared spectroscopy showed that a large amount of xanthate species was adsorbed onto the sulfidized cuprite surfaces after pre-oxidation, which enhanced the cuprite hydrophobicity and improved the cuprite flotation.

【 授权许可】

Unknown