捕收剂预吸附对硫化矿与硅酸盐分离的影响

Influence mechanism of collector pre-adsorption on separation of sulphide from silicate

通过浮选试验、吸附量试验和红外光谱测试,考察捕收剂戊黄药(PAX)和抑制剂羧甲基纤维素(CMC)的添加顺序对绿泥石与黄铁矿浮选分离的影响,并研究其作用机理。结果表明:先加抑制剂羧甲基纤维素时,羧甲基纤维素是绿泥石的有效抑制剂,但也会抑制黄铁矿的浮选,影响绿泥石与黄铁矿的浮选分离;先加入捕收剂戊黄药时,羧甲基纤维素对黄铁矿的抑制作用减弱,而绿泥石的浮选回收不受影响,黄铁矿与绿泥石的分离选择性提高。抑制剂羧甲基纤维素能同时吸附在黄铁矿与绿泥石表面,而捕收剂戊黄药只能吸附在黄铁矿表面。戊黄药与羧甲基纤维素在黄铁矿表面存在竞争吸附,先加捕收剂时,戊黄药的预先吸附降低了羧甲基纤维素在黄铁矿表面的吸附量,减弱了羧甲基纤维素对黄铁矿的抑制作用,提高了黄铁矿与绿泥石的分离选择性。

The effects of collector potassium amyl xanthale (PAX) and depressant carboxy methyl cellulose (CMC) addition order on the separation of chlorite from pyrite were investigated by flotation tests, adsorption tests and FTIR study. The results show that CMC is an effective depressant in the flotation of chlorite, while it also depresses the flotation of pyrite. With the addition of PAX first, the depression effect of CMC on the pyrite is weakened while the chlorite flotation recovery is not influenced. CMC is adsorbed on the surfaces of both pyrite and serpentine while PAX is only adsorbed on the pyrite surface. CMC and PAX compete in adsorbing on pyrite surface and the adsorption density of CMC decreases in the presence of a pre-adsorbed layer of PAX. However, there is no competitive adsorption on the chlorite surface between PAX and CMC, while PAX can not be adsorbed on the chlorite surface.