摘要
通过吸附量测试、纯矿物浮选和红外光谱分析,研究Cu2+和Ni2+离子在蛇纹石表面的吸附过程及对蛇纹石浮选的活化机理.Cu2+和Ni2+离子在蛇纹石表面的吸附符合二级动力学模型,等温吸附过程符合Langmuir等温吸附模型,吸附能够自发进行,为物理吸附和化学吸附的共同作用,Cu2+和Ni2+离子在蛇纹石表面的吸附量随p H值升高而增大.Cu2+和Ni2+离子在弱碱性条件下对蛇纹石具有活化作用,活化机理为铜镍的氢氧化物沉淀和羟基络合物作用于蛇纹石表面,形成活性位点,黄药在活性位点上吸附生成黄原酸铜或黄原酸镍,从而使蛇纹石表面疏水性增大,浮选受到活化.
The adsorption and activation mechanisms of Cu2 ＋and Ni2 ＋ions on serpentine were investigated through adsorption measurements,pure mineral flotation tests and IR spectra analyses. It is found that the adsorption of Cu2 ＋and Ni2 ＋ions on serpentine agrees with the second order kinetics model,and the isothermal adsorption process correlates well with the Langmuir isotherm model.The adsorption is a spontaneous process,which is caused jointly by physical and chemical functions. The adsorption amount of Cu2 ＋and Ni2 ＋ions on serpentine increases with increasing p H values. Under a weak alkaline condition,serpentine can be activated by Cu2 ＋and Ni2 ＋ions. The active sites can be formed on the surface of serpentine after being reacted with hydroxide and hydroxy complexes of copper and nickel,on which xanthates can be adsorbed to generate copper and nickel xanthates. These hydrophobic products improve the surface hydrophobicity of serpentine and thus activate its flotation.
出处
《工程科学学报》
EI
CSCD
北大核心
2016年第4期461-467,共7页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(51174154)
内蒙古自然科学基金资助项目(2014MS0521)
关键词
浮选
蛇纹石
铜
镍
吸附
活化
机理
flotation
serpentine
copper
nickel
adsorption
activation
mechanisms
