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

作     者：Guang Han Shuming Wen Han Wang Qicheng Feng Guang Han;Shuming Wen;Han Wang;Qicheng Feng

作者机构：State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationFaculty of Land Resources EngineeringKunming University of Science and TechnologyKunming 650093China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2021年第31卷第6期

页      面：1117-1128页

核心收录：

学科分类：0819[工学-矿业工程] 081902[工学-矿物加工工程] 08[工学] 0703[理学-化学] 

基　　金：the Project funded by Ten Thousand Talent Plans for Young Top-notch Talents of Yunnan Province (Grant No. YNWR-QNBJ-2018-051)。 

主　　题：Cuprite Pre-oxidation Enhanced sulfidization Xanthate adsorption 

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 nearly25% 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.