Abstract: AbstractThere are a large number of waste rock in magnetic iron ore （20～0 mm ） in Hemushan Magnetite of Masteel Group to grind， resulting in heavy load of grinding and subsequent system, increasing the operating cost of plan and the tailings pond reserve pressure, and affecting the upgrading of the final concentrate quality. In order to solve these problems， the ZCLA 950-2000 separator was used to carry out the wet pre-concentration and waste-disposal industrial test research, and the ZCLA wet pre-concentration system was reconstructed and the effect was tested according to the industrial test results. The ore with TFe grade of 34.06%was treated under the condition that the drum slope is 15°， rotate speed of drum is 11.3 r/min， the processing capacity is 150 t/h, and the pulp concentration is 47%，and the test indexes of discarding yield rate of 19.73% and TFe grade of tailings is 10.67% are obtained； the ore with TFe grade of 29.19%～37.64% is treated，and the discarding yield rate is 10.93%～29.72% and the MFe recovery rate of higher than 98% indicators. Production practice shows that the ZCLA wet pre-selection and its supporting system run smoothly, stably and reliably. ZCLA950-2000 separator has strong adaptability to the fluctuation of iron grade of ore on-site， and has more efficient throwing for low-grade and high waste rock mixed rate ore. The waste capacity can effectively controlled the loss of magnetic iron minerals. It is the ideal equipment for pre-concentration before grinding in Hemushan Plant. The operation of the process system improves the grade of grinding， reduces the processing capacity of grinding and subsequent systems. The tailing pond reserve pressure reduces the production cost of the concentraror and increases the profit growth point of the enterprise.

Key words: ZCLA separator, Pre-discarding of coarse particles, Waste rock, Decreasing cost and increasing benefit