聚合物对微细粒蛇纹石的絮凝作用及机理  

Mechanism of polymers effect on flocculation behavior of fine serpentine

作　　者：冯其明[1] 龙涛[1] 卢毅屏[1] 欧乐明[1] 张国范[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第9期2531-2536,共6页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划("973"计划)项目(2007CB613602)

摘　　要：通过浊度法沉降实验、Zeta电位测试和红外光谱测试,考察羧甲基纤维素(CMC)、聚丙烯酸钠(PAAS)、聚丙烯酰胺(PAM)3种聚合物对金川硫化铜镍矿主要脉石矿物即蛇纹石的絮凝作用,并对上述不同类型聚合物在矿物表面的吸附机理进行分析。研究结果表明:CMC和PAM在蛇纹石表面的吸附以物理作用为主,而PAAS能够通过化学作用吸附在蛇纹石表面,进而通过聚合物分子的架桥作用使蛇纹石微细颗粒发生絮凝;颗粒间静电相互作用对聚合物的絮凝效果影响显著,静电斥力越小,絮凝效果越好;反之静电斥力越大,絮凝效果越差。The effects of polymers,including CMC,PAAS and PAM,on the flocculation of serpentine gangue resulted from Jinchuan copper-nickel sulphide were investigated by turbidimetric sedimentation tests,zeta-potential measurements and Fourier transform infrared spectroscopy.And then the adsorption mechanism of the polymers on the serpentine surface was analyzed.The results show that CMC and PAM are mainly physically bonded onto the serpentine surface,but PAAS is chemically adsorbed onto the serpentine surface.The flocculation of the fine serpentine comes from the bridging action of adsorbed polymers molecules.Electrostatic interaction between the particles influences the flocculation behavior of the fine serpentine obviously.Less electrostatic repulsion induces the better flocculation of the fine serpentine,and vice versa.

关 键 词：蛇纹石 聚合物 絮凝 浊度 红外光谱 

分 类 号：TD9[矿业工程—选矿]