In allusion to low deposition and high sulfur content of bauxite in China,flotation process for desulfurization of high-sulfur diasporic bauxite and ethyl xanthate as collector was developed ,and the effects of flotation time,pulp density,pH value and particle size of ores were examined.

The correlation between desorption of dixanthogen on the mineral surface and energy level of mineral was researched.

Compared with butyl xanthate and isobutyl xanthate,the flotation tests show that multiplex xanthate has stronger collecting ability and better selectivity,it is an excellent collector of complex and refractory copper ores.

It showed that by using mixed reagent (butyl xanthate/penty1 xanthate ratio was 1∶3)and 9538 collector for sulfide mineral to intensify silver flotation and by adopting the process flow of stage grinding-flotation,the silver recovery rate reached 94.

Results show that the adoption of the 1∶3 ratio mixuse of butyl xanthate and amyl xanthate,and phase grand float technics flow carries through experiment,and acquires perfect index of recovery rate of gold and silver is 94.