超声波强化硫化钠对黄铜矿的抑制及机理研究

Study on the Depressant of Sodium Sulfide to Chalcopyrite and Its Mechanism Enhanced by Ultrasound

为解决铜钼混合精矿分离中黄铜矿抑制剂硫化钠用量大、抑制效果不佳的问题,开展了超声处理强化硫化钠对黄铜矿的抑制效果研究,并采用动电位、紫外可见光分光光度计、X射线光电子能谱(XPS)等检测手段,研究了超声强化硫化钠在黄铜矿表面吸附的作用机理。结果表明,超声处理可以促进硫化钠在黄铜矿表面的吸附,从而增强硫化钠的抑制效果,降低黄铜矿的浮选回收率。在pH值为10、硫化钠浓度为45mg/L、硫化钠作用时间为3min、超声功率为280W、超声时间为30s的条件下,硫化钠的吸附量达到最大,对黄铜矿的抑制作用最强,较硫化钠单独作用时,浮选回收率降低了19.77个百分点,硫化钠吸附量增大了0.201mg/g。机理研究结果表明,超声处理促使黄铜矿表面暴露更多的活性位点,如黄铜矿表面Cu含量由4.41%增加至6.63%,促进了硫化钠在黄铜矿表面的吸附,达到了抑制黄铜矿的效果。

In order to solve the problem that the amount of chalcopyrite sodium sulfide is large and the inhibition effect is not good in the separation of copper-molybdenum bulk concentrate,the inhibition effect of ultrasonic treatment strengthened sodium sulfide on chalcopyrite was studied,and the mechanism of ultrasonic enhanced adsorption of sodium sulfide on the surface of chalcopyrite was studied by means of electrokinetic potential,UV-visible spectrophotometer and X-ray photoelectron spectroscopy(XPS),The results show that ultrasonic treatment can promote the adsorption of sodium sulfide on the surface of chalcopyrite,so as to enhance the inhibition effect of sodium sulfide and reduce the flotation recovery of chalcopyrite.Under the conditions of pH value of 10,sodium sulfide concentration of 45 mg/L,sodium sulfide action time of 3 min,ultrasonic power of 280 W and ultrasonic time of 30 s,the adsorption capacity of sodium sulfide reaches the maximum,and the inhibition effect on chalcopyrite is the strongest.Compared with sodium sulfide action alone,the flotation recovery is reduced by 19.77 percentage points.The adsorption capacity of sodium sulfide increased by 0.201 mg/g.The mechanism study showed that ultrasonic treatment promoted the exposure of more active sites on the surface of chalcopyrite,such as the Cu content on the surface of chalcopyrite increased from 4.41%to 6.63%,promoting the adsorption of sodium sulfide on the surface of chalcopyrite,and achieved the effect of inhibiting chalcopyrite.