有机抑制剂鞣酸对黄铜矿和方铅矿浮选的影响

Effect of Tannic Acid on Flotation of Chalcopyrite and Galena

通过单矿物、人工混合矿、实际矿石浮选试验,吸附量和红外光谱测试,研究了鞣酸对黄铜矿和方铅矿浮选的影响及其与矿物的作用机理。结果表明,鞣酸对方铅矿具有强抑制作用,对黄铜矿浮选的抑制作用较小。当鞣酸用量为5 mg/L,浮选180 s时,黄铜矿回收率为83.30%,而方铅矿的回收率只有17.65%。吸附量测试表明,鞣酸在黄铜矿表面的吸附密度为2.03 mg/m2,在方铅矿表面能够达到6.05 mg/m2。红外光谱检测表明,鞣酸通过酚羟基与方铅矿表面发生作用,与黄铜矿作用则很弱,这正是鞣酸能抑制方铅矿的原因。

The effect of tannic acid on the flotation of chalcopyrite and galena was investigated by flotation experiments, adsorption testing and infrared spectroscopy test. The results show that tannic can strongly depress the galena while has weekly impact on the flotation of chalcopyrite. When the amount of tannic acid was 5 mg/L, chalcopyrite recovery was 83.30% , and the recovery rate of galena was only 17.65%. The adsorption tests results show that the adsorption density of tannic acid on chalcopyrite surface is 2.03 mg / m2, and on the galena surface is 6.05 mg/m2. Infrared spectroscopy analysis suggests that the tannic acid interact with the galena surface by phenolic hydroxy group, but weakly act with chalcopyrite, which is the reason that tannic acid can depress galena.