硫代乳酸抑制剂分离辉钼矿与黄铜矿:浮选行为及机理  

Separation of molybdenite from chalcopyrite with thiolactic acid depressant:Flotation behavior and mechanism

作　　者：黄伟欣 唐鸿鹄[1,2] 曹杨[1,2] 刘若华 孙伟[1,2] Wei-xin HUANG;Hong-hu TANG;Yang CAO;Ruo-hua LIU;Wei SUN(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083 [2]中南大学金属资源开发利用碳减排教育部工程研究中心,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第10期3157-3167,共11页中国有色金属学报（英文版）

基　　金：funded by the National Key R&D Program of China(No.2022YFC2904501);the National Natural Science Foundation of China(Nos.52004335,52004337);the Natural Science Foundation of Hunan Province,China(No.2023JJ20071);the Science and Technology Innovation Program of Hunan Province,China(No.2023RC3067);the Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,China(No.2018TP1002)。

摘　　要：针对黄铜矿与辉钼矿可浮性相似导致分离难的问题,亟需开发一种经济与绿色的抑制剂。提出一种新型黄铜矿抑制剂硫代乳酸。通过单矿物和人工混合矿浮选实验,对硫代乳酸的浮选行为进行研究。单矿物浮选实验结果表明,硫代乳酸对黄铜矿具有较好的抑制效果,硫代乳酸作用后,黄铜矿浮选回收率从81%下降至9.7%,而辉钼矿浮选回收率仍保持在71%以上。人工混合矿浮选实验表明,黄铜矿与辉钼矿分离效果较好,高登选择性指数为12.9。采用FT-IR、XPS和AFM等方法研究硫代乳酸在辉钼矿和黄铜矿表面的反应机理,并提出可能的吸附模型。结果表明,硫代乳酸的—SH和—COOH基团优先占据黄铜矿表面活性铜位点,阻止丁基黄原酸钠在黄铜矿表面的化学吸附。The separation of molybdenite and chalcopyrite is a major challenge because of their similar floatability.It is essential to discover a depressant for selectively inhibiting chalcopyrite in a profitable and sustainable way.A novel chalcopyrite depressant,thiolactic acid(TLA),was proposed.The flotation behaviors were studied through micro-flotation and artificial mixed minerals flotation.Micro-flotation experiments indicated that thiolactic acid could significantly suppress chalcopyrite recovery from 81%to 9.7%,along with molybdenite recovery always more than 71%.Artificial mixed minerals flotation experiments showed a distinct separation behavior between chalcopyrite and molybdenite with an optimal Gaudin’s selectivity index of 12.9.The reactivity mechanism of TLA on molybdenite and chalcopyrite surfaces was determined by FT-IR,XPS,and AFM with a possible adsorption model presented.The results revealed that—SH and—COOH groups of TLA preferentially occupied the active copper site on chalcopyrite surface,inhibiting subsequent sodium n-butyl xanthate chemisorption.

关 键 词：硫代乳酸 黄铜矿 黄铜矿抑制剂 铜钼分离 

分 类 号：TD952[矿业工程—选矿] TD923