磷酸盐对细粒铝硅酸盐矿物分散行为的影响  

Influences of phosphates on dispersion of fine alumin-silicate minerals

作　　者：王毓华[1] 陈兴华[2] 胡业民[1] 兰叶[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 [2]中国铝业股份有限公司郑州研究院,河南郑州450041

出　　处：《中南大学学报（自然科学版）》2007年第2期238-244,共7页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划资助项目(2005CB623701)

摘　　要：采用沉降实验考查磷酸盐对一水硬铝石、高岭石、伊利石和叶蜡石分散行为的影响规律。测定ζ电位和DLVO理论计算,分析六偏磷酸钠提高4种铝硅酸盐矿物分散性的作用机理。结果表明:磷酸盐对这4种矿物分散效果由强至弱的顺序为:六偏磷酸钠,焦磷酸钠,磷酸三钠;六偏磷酸钠增大铝硅酸盐矿物颗粒表面电位的绝对值,从而提高了颗粒间静电排斥作用;同时,六偏磷酸钠吸附于铝硅酸盐矿物表面后,加剧了颗粒之间的空间位阻效应,使颗粒间产生较强的位阻排斥力。Influences of phosphates on the dispersion of diaspore, kaolinite, illite and pyrophyllite were systematically investigated by sedimentation experiments. The dispersion mechanisms of sodium hexametaphosphate on the four aluminum-silicate minerals were confirmed by measurements of zeta potentials and theoretical calculations of DLVO. The results show that the dispersity order of phosphates from strong to weak is as follows： sodium hexametaphosphate, sodium pyrophosphate, trisodium phosphate. The absolute value of zeta potentials of aluminum-silicate minerals and the electrostatic repulsion among mineral particles increase with addition of sodium hexametaphosphate. The space steric effects among mineral particles are also intensified due to the adsorption of sodium hexametaphosphate on the surface of aluminum-silicate minerals, then the steric repulsion among particles is enhanced.

关 键 词：一水硬铝石 硅酸盐 磷酸盐 Ζ电位 分散 

分 类 号：TD952[矿业工程—选矿]