鞣酸对方铅矿及黄铁矿的抑制作用  

Research on Tannic Acid as Depressant for Galena and Pyrite

作　　者：邱仙辉[1] 孙传尧[2] 邱廷省[3] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京矿冶研究总院矿物加工国家重点实验室,北京100070 [3]江西理工大学资源与环境工程学院,江西赣州341000

出　　处：《东北大学学报（自然科学版）》2015年第1期124-128,共5页Journal of Northeastern University(Natural Science)

基　　金：国际科技合作与交流项目(2012DFG71060);国家自然科学基金资助项目(51004015)

摘　　要：通过浮选试验发现有机抑制剂鞣酸能强烈抑制方铅矿和黄铁矿的浮选而对黄铜矿浮选影响较小.通过吸附量、紫外光谱、循环伏安扫描及交流阻抗法研究了鞣酸对方铅矿和黄铁矿的抑制机理.结果表明:鞣酸吸附在方铅矿和黄铁矿表面,增大了矿物表面的法拉第反应电阻;鞣酸能够影响乙基黄药在方铅矿和黄铁矿表面的电化学反应,阻碍部分乙基黄药在方铅矿和黄铁矿表面吸附.鞣酸本身的亲水性以及能够减少乙基黄药在矿物表面疏水产物的生成,是鞣酸能够强烈抑制黄铁矿及方铅矿浮选的原因.An organic depressant tannic acid can strongly depress the galena and pyrite while has weekly impact on the flotation of chalcopyrite. Adsorption, UV spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy （EIS） tests were carried out to investigate the depress mechanism. The results showed that tannic acid adsorbed on the surface of galena and pyrite, which increased the Faraday resistance on mineral surface. Tannic acid can affect the electrochemical oxidation reaction of ethyl xanthate on galena and pyrite surface, hinder part of ethyl xanthate adsorbing on pyrite and galena surface. Since the hydrophilic of tannic acid and it can reduce the formation of hydrophobic product on mineral surfaces, which are the reasons for tannic acid can strongly depress the flotation of galena and pyrite.

关 键 词：硫化矿浮选 黄铁矿 方铅矿 有机抑制剂 电化学 吸附作用 

分 类 号：TD952[矿业工程—选矿]