Synergistic activation of smithsonite with copper-ammonium species for enhancing surface reactivity and xanthate adsorption  

作　　者：Wenjuan Zhao Bin Yang Yahui Yi Qicheng Feng Dianwen Liu 

机构地区：[1]State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China [2]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China [3]Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources,Kunming University of Science and Technology,Kunming 650093,China

出　　处：《International Journal of Mining Science and Technology》2023年第4期519-527,共9页矿业科学技术学报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.52264026);Yunnan Fundamental Research Projects(Nos.202301AW070018,and 202101BE070001-009)。

摘　　要：Copper ions(Cu^(2+))are usually added to activate the sulfidized surface of zinc oxide minerals to enhance xanthate attachment using sulfidization xanthate flotation technology.The adsorption of Cu^(2+)and xanthate on the sulfidized surface was investigated in various systems,and its effect on the surface hydrophobicity and flotation performance was revealed by multiple analytical methods and experiments.X-ray photoelectron spectroscopy(XPS)and time-of-flight secondary ion mass spectrometry(To F-SIMS)characterization demonstrated that the adsorption of Cu^(2+)on sulfidized smithsonite surfaces increased the active Cu—S content,regardless of treatment in any activation system.The sulfidized surface pretreated with NH_(4)^(+)-Cu^(2+)created favorable conditions for the adsorption of more Cu^(2+),significantly enhancing the smithsonite reactivity.Zeta potential determination,ultraviolet(UV)-visible spectroscopy,Fourier transform-infrared(FT-IR)measurements,and contact angle detection showed that xanthate was chemically adsorbed on the sulfidized surface,and its adsorption capacity in various systems was illustrated from qualitative and quantitative aspects.In comparison to the Na2S–Cu^(2+)and Cu^(2+)–Na2S–Cu^(2+)systems,xanthate exhibited a higher adsorption capacity on sulfidized smithsonite surfaces in NH_(4)^(+)-Cu^(2+)–Na2S–Cu^(2+)system.Hence,activation with Cu^(2+)–NH4+synergistic species prior to sulfidization significantly enhanced the mineral surface hydrophobicity,thereby increasing its flotation recovery.

关 键 词：Smithsonite surface reactivity Synergistic activation Copper-ammonium species Surface hydrophobicity Enhanced recovery 

分 类 号：TD923[矿业工程—选矿] TD952