While copper-sulphur separation is rather difficult in strong alkaline pulps conditioned by lime,the experiments prove that their separation becomes effective by dereagentization and aeration agitation with the addition of extremely small amount of mixed collectors-butyl xanthate and diethyldithiocarbamate.

It is proved to be reasonable that high speed flotation, regrinding for lead froth ,mixed collectors were used in high alkalinity adjusting and control l ing electria potential flowsheet, through analying the character of ore and tes t reseach in laboratory.

The industrial tests has shown that Cuconcentrate can be obtained by asynchronously preferred flotation flowsheet and mixed collectors.

Through scientific research,break lead concentration pH value,it was introduced that technique of high alkalinity,fine grinding,mixed collectors,high-speed flotation and new type depressant.

The flotation experiments were made by adopting the mixed-anion collectors and the anion-cation collectors to concentrate fluorite, the cost of reagent was obviously reduced by replacing the single-reagent with the mixed-anion reagent in the plant.