苯乙烯膦酸对锡石可浮性影响及其作用机理分析

通过单矿物浮选试验考察了油酸钠、苯乙烯膦酸、水杨羟肟酸3种不同捕收剂对微细粒锡石可浮性的影响，并采用动电位检测、原子力显微镜测定和X射线光电子能谱分析的方法研究了苯乙烯膦酸与锡石表面的作用机理。试验结果表明：油酸钠、苯乙烯膦酸、水杨羟肟酸均能在微细粒锡石的浮选中提高锡石的可浮性，3种捕收剂对锡石的捕收效果由强到弱为：苯乙烯膦酸>油酸钠>水杨羟肟酸。苯乙烯膦酸主要以化学吸附的形式与锡石表面发生作用，在锡石表面形成了有选择性的峰状吸附点，使锡石表面的动电位发生负移，其膦酸基上的2个O原子在矿浆中脱去H+后，能够与锡石表面的Sn原子发生结合，稳定地吸附于锡石表面。

Influences of Styrene Phosphonic Acid on the Floatability of Fine Cassiterite and Its Mechanism

The influence of three different collectors sodium oleate， styrene phosphonic acid and salicylhydroxamic acid on fine cassiterite flotation are investigated by conducting a series of micro-flotation tests， and the mechanism of styrene phosphonic acid collecting cassiterite is assessed by Zeta potential determination， atomic force microscopy and X-ray photoelectron spectroscopy. The experiment results indicates that sodiumoleate， styrene phosphonic acid and salicylhydroxamic acid can improve the floatability of cassiterite in the flotation of fine cassiterite， and the collecting capability of the three collectors towards fine cassiterite decreases in the order as follows: styrene phosphonic acid＞sodium oleate＞salicylhydroxamic acid. The styrene phosphonic acid mainly chemically adsorbs the surface of cassiterite， which forms many selective peak-like adsorption points on the surface of cassiterite and moves the Zeta potential of the surface of cassiterite to the negative direction. The two O atoms losing H+ on the phosphonic acid group can be combined with the Sn atom on the surface of cassiterite， which causes the styrene phosphonic acid is stably adsorbed on the surface of cassiterite.