Taking ZGM956 type medium speed mill as the object to study

the inner flow field in said mill has been numerically simulated by using the FLUENT programme

and discrete phase model being adopted in simulating the discharge of pyrites from said mill.Results show that the static pressure and the flow rate at each nozzle ring are non-uniformly distributed

and the discharged pyrites in regions with low flow rate are more than those in other regions.The primary air velocity is the highest at the nozzle ring

and this is an important factor to affect the discharge of pyrites.Along with the increase of particle size

the quantily of discharged pyrites is also gradually increased

and more pyrites would be discharged with increasing thier density.