氧气和硫化钠对赤铜矿浮选的影响及作用机理  

Effect of oxygen and sodium sulfide on flotation of cuprite and its modification mechanism

作　　者：贾晓东 宋凯伟[1,2] 蔡锦鹏 苏超 徐晓会 马印禹 申培伦 刘殿文[1,2] Xiao-dong JIA;Kai-wei SONG;Jin-peng CAI;Chao SU;Xiao-hui XU;Yin-yu MA;Pei-lun SHEN;Dian-wen LIU(State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources,Kunming University of Science and Technology,Kunming 650093,China;Graduate School,North China University of Science and Technology,Tangshan 063210,China;Shandong Gold Group Co.,Ltd.,Jinan 250100,China)

机构地区：[1]昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室,昆明650093 [2]昆明理工大学云南省战略金属矿产资源绿色分离与富集重点实验室,昆明650093 [3]华北理工大学研究生院,唐山063210 [4]山东黄金集团有限公司,济南250100

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第4期1233-1243,共11页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52074138);the Fundamental Research Project of Yunnan Province,China(No.202001AS070030)。

摘　　要：通过浮选试验、场发射扫描电子显微镜(FESEM)、电子探针(EPMA)以及X射线光电子能谱(XPS)等研究氧气和硫化钠对赤铜矿浮选的影响。浮选试验表明,用适量的硫化钠预处理赤铜矿表面后可大幅提升赤铜矿的可浮性。FESEM显示硫化后的赤铜矿表面覆盖有大量碎片,在Na_(2)S浓度为5.0×10^(−4)mol/L时,这些碎片的形状更加规则和完整。结合EPMA和EDS分析发现,这些碎片是新形成的铜硫化物,是促进赤铜矿高效浮选的关键。XPS分析表明,赤铜矿暴露于空气中表面极易被氧化成CuO,硫化钠优先与表面的CuO膜发生氧化还原反应,此过程中,Cu^(2+)被还原为Cu^(+),S^(2-)主要被氧化为(S_(2))^(2-)和(S_(n))^(2−)。Effect of oxygen and Na_(2)S on the flotation of cuprite was invested by flotation test,FESEM,EMPA and XPS.The micro-flotation experiments indicated that the flotation recovery of cuprite can be greatly increased by adding an appropriate amount of Na_(2)S.FESEM showed that numerous fragments were covered on the cuprite surfaces after sulfidization,and the shapes of these fragments were more regular and complete with the Na_(2)S concentration of 5.0×10^(−4)mol/L.EPMA and EDS analysis confirmed that these fragments were newly-formed copper sulfide species,which was the key to promoting the flotation of cuprite.XPS analysis revealed that the sulfidization process of cuprite was that Na_(2)S first underwent an oxidation−reduction reaction with the CuO on its surface,which was due to the extremely easy oxidation of the surface of cuprite.The Cu^(2+)was reduced to Cu^(+),and S^(2−) was mainly oxidized to(S_(2))^(2-)and(S_(n))^(2−).

关 键 词：赤铜矿 硫化浮选 硫化机理 氧化 硫化铜 

分 类 号：TD952[矿业工程—选矿] TD923