铜离子对锡石浮选的影响及其机理研究

为探索Cu²⁺对锡石的活化机理，在苯乙烯膦酸（SPA）浮选体系中进行锡石单矿物浮选试验。结果表明，在pH为2.0~7.4的范围内Cu²⁺对锡石具有活化作用，在pH=4，SPA用量250 mg/L，Cu²⁺用量为4×10^-3 mol/L条件下，锡石的浮选回收率较未添加Cu²⁺时提高了11个百分点。动电位检测和XPS分析结果显示：Cu²⁺可以通过吸附或者取代作用在锡石表面，增加锡石表面与SPA作用的反应位点，进而活化锡石，增加SPA在锡石表面的吸附量。试验结果可以为锡石资源的浮选回收工艺提供指导。

Study on the Effect and Mechanism of Cu2+ on Cassiterite Flotation

In order to explore the activation mechanism of Cu²⁺ on cassiterite， the monomineral flotation experiment of cassiterite was carried out in the styrene phosphonic acid （SPA） flotation system. The results show that Cu²⁺ has activation effect on cassiterite in the pH range of 2.0~7.4. Under the conditions of pH=4， SPA dosage of 250 mg/L and Cu²⁺ dosage of 4 ×10^-3 mol/L， the flotation recovery rate of cassiterite is 11 percentage points higher than that without Cu²⁺. The results of electrodynamic potential detection and XPS analysis showed that Cu²⁺ could increase the reaction site of SPA on the surface of cassiterite by adsorption or substitution， thus increasing the adsorption amount of SPA on the surface of cassiterite and activating cassiterite. The results are of great significance for the flotation recovery increase of cassiterite resources.