| The main metal minerals in Yunnan copper mine tailings are chalcopyrite, pyrite and pyrrhotite etc. The chalcopyrite is mainly primary copper sulfide, and gold is mainly bare gold and chalcopyrite coated gold. Mineral processing experiments were carried out for the comprehensive recovery of copper and gold. When 85% of the sample is within a grinding fineness of -200 mesh following grinding, it was subjected to the mineral separation. The process includes: two-time rough selection, one-time sweep selection, two-time selection twice, sweep selection once again. The resulting mixed concentrate was grinded again to such an extent that 85% of the concentrate had a grinding fineness of -325 mesh before the rough selection and then the selection were conducted once more. Copper containing in the final concentrate reached up to 15.51% with a recovery rate of 68.34%, gold 19.93 g/t with a recovery rate of 54.04%, silver 231.72 g/t with a recovery rate of 41.89%. |
