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.

Through experimentation and research in this ore,we use flotation and magnetic dressing, and part of amalgamate flotation,and chose amalgamate concentrate of copper and lead, then asunder copper and lead,and flotation zinc and sulphur,and flotation rejection,and magnetic dressin.

At present,two kinds of flowsheets are adopted in Qidashan Beneficiation Plant-"stage-wise grinding-gravity separation,magnetic separation and anion reverse flotation" and"continuous grinding-low intensity magnetic separation,high intensity magnetic separation and anion reverse flotation".

It is then determined that the flowsheet of stage-wise grinding—gravity separation—high intensity magnetic separation-anion reverse flotation is most reasonable for beneficiation of poor hematite from Gongchangling Mine.

Based on process mineralogical characteristics of villaninite,a process of "stage grinding,stage flotation,and concentrate discharge from two points" was adopted.

The experimental studies on stage grinding and leaching of high sulfurcontaining gold concentrate of Rusan District are made.

After the process mineralogical study and beneficiation experiments on ores from Dagushan and Yanqianshan,and lean magnetite ore from Gongchangling,it is concluded that a process consists of stage grinding,single magnetic separation,and fine screening-regrinding is technically advanced and feasible in treating lean magnetite ores from Anshan.

78% iron was separated in the laboratory by using the craft flow of staged grinding and classification-gravity separation-magnetic separation-anionic reverse flotation.