Abstract: For the purpose of improving the utilization rate of the recycled powder, the recycled powder was treated by mechanical force grinding.The effects on the properties of recycled powders from pulverization and vibration milling were studied.The particle size distribution, phase configuration and micro-morphology of the recycled powders were tested by laser particle size analyzer, XRD and SEM.And the compressive strength of the mortars was tested by the pressure testing machine.The activity of the recycled powder were also calculated according to national standards.The results show that the recycled powder crushed by superfine air pulverizer is of well filling effect and high activity, narrow size distribution and regular particle shape.The processing of the superfine air pulverizer on the recycled powder improves both the utilization rate and the utilization range of the recycled powder.

Key words: For the purpose of improving the utilization rate of the recycled powder, the recycled powder was treated by mechanical force grinding.The effects on the properties of recycled powders from pulverization and vibration milling were studied.The particle size distribution, phase configuration and micro-morphology of the recycled powders were tested by laser particle size analyzer, XRD and SEM.And the compressive strength of the mortars was tested by the pressure testing machine.The activity of the recycled powder were also calculated according to national standards.The results show that the recycled powder crushed by superfine air pulverizer is of well filling effect and high activity, narrow size distribution and regular particle shape.The processing of the superfine air pulverizer on the recycled powder improves both the utilization rate and the utilization range of the recycled powder.