工程科学学报，第40卷，第5期：540-547,2018年5月 Chinese Joural of Engineering,Vol.40,No.5:540-547,May 2018 DOI:10.13374/j.issn2095-9389.2018.05.003;http://journals.ustb.edu.cn 有机抑制剂SDD与BX在铜活化闪锌矿表面的竞争吸 附机制 罗德强)，刘建12)，王瑜)，曾勇) 1)昆明理工大学国土资源工程学院，昆明6500932)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 区通信作者，E-mail:vacation2008@126.com 摘要通过单矿物浮选试验揭示了有机抑制剂SDD对铜活化闪锌矿的抑制情况.在此基础上，采用Zta电位测试、Versa STAT电化学工作站的局部交流阻抗(LEIS)测试，前线轨道理论计算对SDD和BX(丁基黄药)在铜活化闪锌矿表面的竞争吸 附机理进行了研究.浮选试验结果表明：SDD是一种铜锌分离的高效抑制剂，能够有效的抑制闪锌矿，而黄铜矿几乎不受影 响：此外，还发现SDD具有用量少且十分敏感的特性，在pH为10，SDD为4.0×10~5mlL的最佳条件下，能够将铜活化闪 锌矿的回收率降低至16.59%，而黄铜矿旷的回收率为81.64%.Zeta电位和局部交流阻抗(LEIS)分析表明：SDD不但能够占据 铜活化闪锌矿表面的活化位点，而且其吸附能力强于BX,这极大的降低了BX在铜活化闪锌矿表面的吸附量，从而对铜活化 闪锌矿表现出良好的抑制作用.前线轨道理论计算进一步证实SDD与铜活化闪锌矿作用能力强于BX 关键词铜活化闪锌矿：二甲基二硫代氨基甲酸钠：竞争吸附：局部交流阻抗：前线轨道理论 分类号TD952 Competitive adsorption mechanism of organic depressant SDD with BX on copper-activated sphalerite LUO De-giang,LIU Jian),WANG Yu,ZENG Yong?) 1)Faculty of Land Resource Engineering.Kunming University of Science and Technology,Kunming 650093.China 2)State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093, China Corresponding author,E-mail:vacation2008@126.com ABSTRACT The separation of Cu-Zn polymetallic sulfide by flotation has been a difficult and well-researched topic in the field of mineral processing.One of the important reasons why it is difficult to separate Cu and Zn is the presence of a large amount of copper ions in the pulp,which results in the unavoidable activation of sphalerite.The key to solving this difficulty is the development of a high-selectivity depressor for sphalerite.Sodium dimethyl dithiocarbamate (SDD,C,H.NS,Na)is the lowest homologue of dialkyldi- thiocarbamate salts,and it has the shortest hydrophobic group(-CH)in its molecular structure with weak hydrophobicity.In prelimi- nary exploration experiments,it was found that SDD has good selectivity for Cu-Zn sulfide flotation and can achieve better separation performance than conventional depressors.However,the depression mechanism is not very clear.In this work,the depression effect of SDD on copper-activated sphalerite was revealed by conducting a monomineral flotation test.Based on the results of this test,the com- petitive adsorption mechanism of SDD and BX on the surface of copper-activated sphalerite was further studied by conducting the Zeta potential test,LEIS (local AC impedance)test of Versa STAT electrochemical workstation,and frontal orbital theory calculation.The 收稿日期：2017-09-19 基金项目：国家自然科学基金资助项目(51764037,51704135)：云南省青年人才培养基金资助项目(KKSY201421110):云铜校企预研基金资助 项目(KKZ4201521003)工程科学学报,第 40 卷,第 5 期:540鄄鄄547,2018 年 5 月 Chinese Journal of Engineering, Vol. 40, No. 5: 540鄄鄄547, May 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 05. 003; http: / / journals. ustb. edu. cn 有机抑制剂 SDD 与 BX 在铜活化闪锌矿表面的竞争吸 附机制 罗德强1) , 刘 建1,2) 苣 , 王 瑜1) , 曾 勇2) 1) 昆明理工大学国土资源工程学院, 昆明 650093 2) 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 苣 通信作者, E鄄mail: vacation2008@ 126. com 摘 要 通过单矿物浮选试验揭示了有机抑制剂 SDD 对铜活化闪锌矿的抑制情况. 在此基础上,采用 Zeta 电位测试、Versa STAT 电化学工作站的局部交流阻抗(LEIS)测试、前线轨道理论计算对 SDD 和 BX(丁基黄药)在铜活化闪锌矿表面的竞争吸 附机理进行了研究. 浮选试验结果表明:SDD 是一种铜锌分离的高效抑制剂,能够有效的抑制闪锌矿,而黄铜矿几乎不受影 响;此外,还发现 SDD 具有用量少且十分敏感的特性,在 pH 为 10,SDD 为 4郾 0 伊 10 - 5 mol·L - 1的最佳条件下,能够将铜活化闪 锌矿的回收率降低至 16郾 59% ,而黄铜矿的回收率为 81郾 64% . Zeta 电位和局部交流阻抗(LEIS)分析表明:SDD 不但能够占据 铜活化闪锌矿表面的活化位点,而且其吸附能力强于 BX,这极大的降低了 BX 在铜活化闪锌矿表面的吸附量,从而对铜活化 闪锌矿表现出良好的抑制作用. 前线轨道理论计算进一步证实 SDD 与铜活化闪锌矿作用能力强于 BX. 关键词 铜活化闪锌矿; 二甲基二硫代氨基甲酸钠; 竞争吸附; 局部交流阻抗; 前线轨道理论 分类号 TD952 收稿日期: 2017鄄鄄09鄄鄄19 基金项目: 国家自然科学基金资助项目(51764037,51704135);云南省青年人才培养基金资助项目(KKSY201421110);云铜校企预研基金资助 项目(KKZ4201521003) Competitive adsorption mechanism of organic depressant SDD with BX on copper鄄activated sphalerite LUO De鄄qiang 1) , LIU Jian 1,2) 苣 , WANG Yu 1) , ZENG Yong 2) 1)Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China 2)State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China 苣 Corresponding author, E鄄mail: vacation2008@ 126. com ABSTRACT The separation of Cu鄄鄄Zn polymetallic sulfide by flotation has been a difficult and well鄄researched topic in the field of mineral processing. One of the important reasons why it is difficult to separate Cu and Zn is the presence of a large amount of copper ions in the pulp, which results in the unavoidable activation of sphalerite. The key to solving this difficulty is the development of a high鄄selectivity depressor for sphalerite. Sodium dimethyl dithiocarbamate ( SDD, C3 H6NS2Na) is the lowest homologue of dialkyldi鄄 thiocarbamate salts, and it has the shortest hydrophobic group (鄄鄄CH3 ) in its molecular structure with weak hydrophobicity. In prelimi鄄 nary exploration experiments, it was found that SDD has good selectivity for Cu鄄鄄Zn sulfide flotation and can achieve better separation performance than conventional depressors. However, the depression mechanism is not very clear. In this work, the depression effect of SDD on copper鄄activated sphalerite was revealed by conducting a monomineral flotation test. Based on the results of this test, the com鄄 petitive adsorption mechanism of SDD and BX on the surface of copper鄄activated sphalerite was further studied by conducting the Zeta potential test, LEIS (local AC impedance) test of Versa STAT electrochemical workstation, and frontal orbital theory calculation. The