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Selective Separation of Chalcopyrite from Galena Using a Green Reagent Scheme
Minerals ( IF 2.5 ) Pub Date : 2021-07-22 , DOI: 10.3390/min11080796
Kaile Zhao , Chao Ma , Guohua Gu , Zhiyong Gao

The study of the depression effect of non-toxic depressants on the flotation separation of chalcopyrite from galena is of great importance for both industrial applications and theoretical research. The mixed depressant (DFinal) of four common inhibitors—sodium carboxymethyl cellulose, sodium silicate, sodium sulfite, and zinc sulfate—exhibited high selectivity during the separation of chalcopyrite from galena. Flotation tests on an industrial copper–lead bulk concentrate showed that using this depressant mixture can achieve highly efficient separation of chalcopyrite from galena at the natural pH of the pulp. Copper and lead concentrates were produced at grades of 21.88% (Cu) and 75.53% (Pb), with recoveries of 89.07% (Cu) and 98.26% (Pb). This showed a similar performance of DFinal with dichromate, which is a depressant that is widely used in industry, but without the environmental risks or the need for pH control. Zeta potential and Fourier transform infrared (FT-IR) results showed that interaction between the surface of the chalcopyrite and the mixed depressant was prevented by pre-treatment with a composite thiophosphate collector (CSU11), while the mixed depressant could expel/replace the composite thiophosphate on the surface of galena by chemical adsorption, depressing its flotation. This is the reason why this non-toxic depressant achieved the selective depression of galena from chalcopyrite, leading to efficient flotation separation.

中文翻译:

使用绿色试剂方案从方铅矿中选择性分离黄铜矿

研究无毒抑制剂对方铅矿浮选分离黄铜矿的抑制作用对于工业应用和理论研究都具有重要意义。四种常见抑制剂(羧甲基纤维素钠、硅酸钠、亚硫酸钠和硫酸锌)的混合抑制剂 (D Final ) 在从方铅矿中分离黄铜矿的过程中表现出高选择性。对工业铜铅散装精矿的浮选试验表明,在纸浆的自然 pH 值下,使用这种抑制剂混合物可以实现黄铜矿与方铅矿的高效分离。铜和铅精矿的品位分别为 21.88% (Cu) 和 75.53% (Pb),回收率为 89.07% (Cu) 和 98.26% (Pb)。这显示了类似 D Final 的表现重铬酸盐是一种广泛用于工业的抑制剂,但没有环境风险或需要控制 pH 值。Zeta 电位和傅里叶变换红外 (FT-IR) 结果表明,用复合硫代磷酸盐捕收剂 (CSU11) 预处理可以防止黄铜矿表面与混合抑制剂之间的相互作用,而混合抑制剂可以排出/取代复合抑制剂硫代磷酸盐通过化学吸附作用在方铅矿表面,抑制其浮选。这就是为什么这种无毒抑制剂实现了从黄铜矿中选择性抑制方铅矿,从而实现高效浮选分离的原因。
更新日期:2021-07-23
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