Abstract: In recent years,the underground cemented filling stoping method with tailing from dressing plant has been widely applied in large-medium underground iron mine.The tailing cemented filling system mainly consists of vertical chamber and two-stage activated agitator,which has characteristics of large site area,complex structure,and high investment and operation costs.Combined with the actual situation of mine,Liutangfang iron mine used tailings from its own dressing plant to carry out the thickening tests by hydrocyclone.A set of low concentration chamber-free tailing filling system is developed with the aid of the automatic intelligent control system.Its application in industry achieved good effect.The industrial application showed that the utilization rate of tailings reached more than 70%,and tailings concentration reached 65%~70%.Overflows from cyclone directly went into the tailings pond.The whole filling system adopts the remote centralized control.No manual operation is needed on site.Meanwhile,the intelligent cement-adding system can realize the precise control of the desired cement ratio and the filling concentration.Through automatic decision and control of fault,the automatic transport switching between tailing filling and tailing ponds can be realized.The system has the advantages of small site area,simple structure,convenient management,low investment and low operation cost.It has a certain reference for similar small or medium underground mines.

Key words: Experimental study, Cyclone, Filling process, Industrial practice