电化学调控浮选能带模型及应用(Ⅲ)——有机抑制剂对硫化矿物能带结构的影响

来源期刊：中国有色金属学报2000年第4期

论文作者：陈建华 冯其明 卢毅屏

文章页码：529 - 533

关键词：有机抑制剂； 电化学调控浮选分离； 能带结构； 硫化矿物

Key words：organic depressants; electrochemical separation; structure of energy band; sulphide minerals

摘    要：用能带理论分析了电化学调控浮选模型， 提出了采用有机抑制剂来改变矿物电子能级、 实现硫化矿的浮选分离。 研究了有机抑制剂对矿物抑制的两种电化学机理： 一是有机抑制剂增加了矿物费米能级， 矿物电子向黄药的空能级传递， 双黄药被还原； 二是有机抑制剂降低了矿物边缘能级， 从而导致矿物表面电子密度增大， 黄药空能级被电子占据， 双黄药被还原。 开发了5种电化学浮选分离新型有机抑制剂， 实现了8种人工混合精矿和3种矿石的浮选分离。

Abstract: The model of electrochemical flotation was analyzed by means of energy band theory， a new viewpoint of electrochemical separation byusing organic depressants to change energy band of minerals was proposed. There are two mechanisms of depressing sulphide minerals in thepresence of organic depressants. One is to increase the Fermi level of minerals by organic depressant， which may lead the electrons transfer into unoccupiedlevel of xanthate， as a result dixanthogen is reduced， such as the case of thioglycollic acid. The other is to lower the limited level of sulphide minerals， which may increase the electronic density of mineral surface， as a resultsthe unoccupied levels of xanthate are occupied by electrons， and dixanthogen is reduced, as the case of sodium humate. Five new organic depressants for electrochemical separation were developed， eight artificial bulk concentrates were separated by use of new organic depressants and three sulphide ores were tested successfully.