组合捕收剂浮选锂辉石的作用机理

Mechanism on flotation of spodumene with combined collector

通过浮选试验、表面张力测试、Zeta电位以及红外光谱分析,考察油酸钠(NaOL)、十二烷基琥珀酰胺(HZ)两种捕收剂及其组合捕收剂对锂辉石的浮选性能和作用机理。结果表明:单一捕收剂在一定浓度下都能较好地浮选锂辉石,其中HZ的捕收性能强于NaOL,组合捕收剂浮选效果明显优于任意单一捕收剂。在药剂用量为200mg/L、pH=9.0左右、组合捕收剂的混合摩尔比n(NaOL):n(HZ)为5:1的条件下,浮选效果最好,浮选回收率达88.48%。红外光谱分析表明NaOL在锂辉石表面以化学吸附为主,HZ则以物理吸附为主,两种捕收剂组合使用后的正协同作用是由于锂辉石矿物表面的不均匀性和表面的活性质点的差异使这两种不同药剂能选择性的吸附在矿物表面的不同位置,从而提高药剂捕收性能。

Flotation performance and mechanism of sodium oleate（Na OL）, twelve alkyl succinic amide（HZ）, and their combined collectors for spodumene were investigated by flotation tests, surface tension test, Zeta potential and infrared spectroscopic analysis. The results show that each of the single collector has a good capacity for spodumene. The collectability of different collectors follows the descending order：Combined collectors, HZ, Na OL. The combined collector（n（Na OL）：n（HZ）=5：1） plays the best role in the flotation at a collector dosage of 200mg/L and p H=9.0, obtaining recovery of 88.48%. The IR result shows that the ways of Na OL and HZ adsorbed on the surface of spodumene are chemosorption and physisorption, respectively. The positive synergistic effect dues to the selective adsorption of the components in the combined collector on the different active sites and the heterogeneity of the different surface can improve the collection performance.