Ultra-fine Electric Furnace Nickel Iron Slag Prepared by Steam Power Mill

The electric furnace nickel-iron slag emission is increasing,but the direct utilization rate is low.In order to improve the comprehensive utilization value of electric furnace nickel iron slag,ultra-fine pulverization experiments were carried out on a LNGS-80 steam power mill（total power 6.7 kW,steam consumption 80 kg/h）.The effects of the classifier speed on the particle size,specific surface area and output of the electric furnace nickel-iron slag were studied.The energy consumption and cost for milling the nickel-iron slag by the LNGS-10 T steam power mill（total power 165 kW,gas consumption 10 000 kg/h） were estimated.The results show that the ultra-fine powder commonly with d₅₀=12.9～52.7 μm,specific surface area of 305～669 m²/kg and yield of 167～480 kg/h,or the ultra-fine powder with d₅₀=2.4～4.7 μm,specific surface area of 1 788～2 669 m²/kg and yield of 35～80 kg/h can be prepared by pulverization and classfication of electric furnace nickel-iron slag using LNGS-80 steam power mill.It is estimated that LNGS-10 T steam power mill can prepare fine powder of electric furnace nickel-iron slag with d₅₀=28.5 μm and specific surface area of 464 m²/kg,and the system power consumption is 5.2 kWh/t which saves 89% of power consumption and 11% of cost compared with the roller mill.