【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。更多还原

【Abstract】 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.更多还原