选择性作用
(中南大学 资源加工与生物工程学院， 长沙 410083)
摘 要: 研究了磷酸盐对一水硬铝石和高岭石的浮选性能。六偏磷酸钠（SHMP）在低用量条件下， 对高岭石的抑制作用大于对一水硬铝石的， 可以实现铝土矿的正浮选脱硅； 而在高用量的条件下，六偏磷酸盐对一水硬铝石的抑制作用很强， 对高岭石的抑制作用与低用量条件相比没有明显变化， 因而可以实现铝土矿的反浮选脱硅。 通过磷酸盐的溶液化学、 六偏磷酸钠对一水硬铝石和高岭石矿物的ζ-电位影响及其在矿物表面上的吸附量测定，同时通过显微镜对溶液中的矿物颗粒成像， 探讨了（NaPO3）6在一水硬铝石和高岭石的胺阳离子反浮选体系中的作用机理。
关键字: 六偏磷酸钠； 一水硬铝石； 高岭石； 反浮选； 抑制作用
（School of Resources Processing & Bi engineering, Central South University, Changsha 410083, China）
Abstract:Phosphates abilities in diaspore and kaolinite flotation were studied. Sodium hexametaphosphte(SHMP) at low concentration has greater depressive ability to kaolinite than that to diaspore, and the normal desilication flotation of bauxite can be realized, while when SHMP is in high concentration, it has much stronger depressive ability to diaspore than that to kaolinite. The antiflotation is expected to gain success. The mechanism of SHMP in separating kaolinite from bauxite was discussed through phosphatic solution chemistry, ζ-potential changes of diaspore and kaolinite in the absence or presence of SHMP, measuring surface phosphate concentration on diaspore and kaolinite and microphotograph of mineral particles in the solution
Key words: sodium-hexametaphosphte(SHMP); anti-flotation; diaspore; kaolinite; depression
