Influence of copper ions and calcium ions on adsorption of CMC on chlorite  

铜离子和钙离子对羧甲基纤维素在绿泥石表面吸附的影响(英文)

作　　者：冯其明[1] 冯博[1] 卢毅屏[1] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第1期237-242,共6页中国有色金属学报（英文版）

基　　金：Project(51174229) supported by the National Natural Science Foundation of China

摘　　要：The effects of copper ions and calcium ions on the depression of chlorite using CMC（carboxymethyl cellulose） as a depressant were studied through flotation tests,adsorption measurements,ζ potential tests and co-precipitation experiments.The results show that the electrostatic repulsion between the CMC molecules and the chlorite surfaces hinders the approach of the CMC to the chlorite while the presence of copper ions and calcium ions enhances the adsorption density of CMC.The action mechanisms of these two types of ions are different.Calcium ions can not adsorb onto the mineral surfaces,but they can interact with the CMC molecules,thus reducing the charge of the CMC and enhancing adsorption density.Copper ions can adsorb onto the mineral surfaces,which facilitates the CMC adsorption through acid/base interaction.The enhanced adsorption density is also attributed to the decreased electrostatic repulsion between the CMC and mineral surfaces as copper ions reduce the surface charge of both the mineral surfaces and the CMC molecules.通过浮选实验、吸附量测试、ζ电位测试和共沉淀实验,研究铜离子和钙离子对羧甲基纤维素(CMC)抑制绿泥石浮选的影响。结果表明,CMC分子和绿泥石表面存在的静电排斥作用阻碍CMC在绿泥石表面的吸附,铜离子和钙离子的存在增加CMC在绿泥石表面的吸附量。两种离子增加CMC吸附量的作用机理存在不同。在pH9的条件下,钙离子不能吸附在绿泥石表面,但能与荷负电的CMC分子反应,减弱CMC与绿泥石表面的静电排斥作用,从而增加CMC的吸附量;铜离子能吸附在绿泥石表面为CMC的吸附提供质点,吸附在绿泥石表面和CMC分子上的铜离子降低二者的电位,减弱静电排斥作用,从而增加CMC在绿泥石表面的吸附量。

关 键 词：CHLORITE carboxymethyl cellulose copper ions calcium ions ADSORPTION 

分 类 号：O647.32[理学—物理化学]