阴阳离子混合捕收剂对异极矿的浮选作用及机理

Flotation behaviour and mechanism of hemimorphite in presence of mixed(cationic/anionic) collectors

采用DDA(十二胺)和KAX(异戊基黄原酸钾)的阳阴离子混合药剂作为捕收剂,对异极矿进行单矿物浮选及检测,并与单独使用DDA或者KAX作为捕收剂进行比较。结果表明:采用DDA和KAX的摩尔比为1:3的混合捕收剂浮选异极矿时,比单独使用DDA或者KAX对异极矿的浮选效果要好,且在pH值为10左右时浮选效果最佳,回收率达86%;DDA和KAX混合后各自所带的阴、阳离子电性中和,降低了捕收剂分子之间的静电斥力,从而使混合捕收剂的临界胶束浓度值降低,在矿物表面吸附时形成半胶束吸附的浓度值降低,更易于在异极矿表面形成半胶束吸附,对矿物浮选捕收效果增强。

The single mineral flotation and detection of hemimorphite in the presence of mixed collector （cationic/anionic） was investigated and compared with DDA （dodecylamine） or KAX （isoamylxanthate） alone. The results show that the flotation efficiency using mixed collectors （DDA and KAX） is better than that using DDA or KAX alone. The optimum pH value is about 10 with the topmost recovery rate of 86%. The mixture of DDA and KAX can decrease the micropolarity of the reagents sharply under the condition of low concentration, which can decrease the CMC value, form a micelle adsorption on the surface of hemimorpphite easier and enhance the capacity of collecting.