NaClO和KMnO4协同氧化对黄铜矿与黄铁矿浮选分离的影响及其机理  

Synergistic Oxidation of NaClO and KMnO4 on Flotation Separation of Chalcopyrite and Pyrite and Mechanism Therein

作　　者：龙逸云 印万忠[1] 龙恺云 LONG Yiyun;YIN Wanzhong;LONG Kaiyun(Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350000,Fujian,China)

机构地区：[1]福州大学紫金地质与矿业学院,福建福州350000

出　　处：《矿冶工程》2024年第5期51-56,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(52174239)。

摘　　要：通过浮选试验、吸附实验、红外光谱和XPS分析等研究了NaClO和KMnO_(4)单独使用以及组合使用对黄铜矿和黄铁矿浮选分离的影响。结果表明,在NaClO与KMnO_(4)质量比10∶1、总质量浓度70 mg/L,矿浆pH=10,氧化时间3 min条件下,黄铜矿回收率达到92%以上,黄铁矿回收率低于8%,较好地实现了黄铜矿与黄铁矿的选择性分离。红外光谱和XPS分析结果表明,组合药剂明显改变了黄铁矿的表面性质,使其表面氧化为氧化铁、氢氧化铁和硫酸铁等亲水性物质,并阻碍捕收剂的吸附,从而降低黄铁矿的可浮性。黄铜矿表面在一定处理条件下对NaClO和KMnO_(4)保持温和惰性,因此黄铜矿表面吸附的黄药量远大于黄铁矿表面,这有利于黄铜矿与黄铁矿的浮选分离。The effects of separate and combined usage of NaClO and KMnO_(4) on the flotation separation of chalcopyrite and pyrite were investigated by performing flotation and adsorption tests,infrared spectroscopy(IR)and XPS analysis.The results show that selective separation of chalcopyrite and pyrite can be achieved with NaClO and KMnO_(4) in a ratio of 10∶1,the total oxidant dosage of 70 mg/L,pulp pH of 10,and oxidation time of 3 min.It is shown that the recovery of chalcopyrite can exceed 92%,while the recovery of pyrite is less than 8%.The IR and XPS analyses show that a combined usage of NaClO and KMnO_(4) obviously changes the surface property of pyrite,resulting in hydrophilic oxidized substances on the surface,such as iron oxide,iron hydroxide and iron sulfate,which impedes the adsorption of collectors,thus reducing floatability of pyrite.The chalcopyrite surface remains mildly inert to NaClO and KMnO_(4) under certain conditions.Consequently,the adsorption of xanthate on chalcopyrite is remarkably higher than that on pyrite,which favors their flotation separation.

关 键 词：黄铜矿 黄铁矿 表面氧化 浮选 抑制剂 捕收剂 氧化剂 铜硫分离 

分 类 号：TD923[矿业工程—选矿]