Study on particle size distribution analysis of steel slag ultra-fine powder
1.Institute of Resources and Environment Engineering of Shanxi University,Taiyuan 030006,China; 2.State Environment Protection Key Laboratory of Efficient Utilization of Coal Waste Resources,Taiyuan 030006,China; 3.Key Laboratory of Coal Pollution Control and Waste Utilization in Shanxi Province,Shuozhou 036000,China
Abstract：The ultra-fine powder(UFP) is an important approach to realize high-efficiency utilization of steel slag. The particle size distribution is one of the key properties of UFP. Steel slag UFP particle size distribution (represented by D10, D50 and D90, which meant the equivalent diameter when the cumulative distribution in sample distribution curve was 10%, 50% and 90%, respectively) were measured by the laser particle size analyzer (LSA), and some influence factors of operating conditions were discussed, including dispersing mediums, solid mass concentration, ultrasonic dispersing time and stirring rate. The particle size distribution of UFP was observed and calculated by scanning electron microscope (SEM), and the found results were compared and verified with those obtained by LSA measurement. The results showed that the proper dispersing medium for concentration measurement of UFP by LSA was anhydrous ethanol. The measurement results of sample particle size decreased with the increase of solid mass concentration in range of 0.10-0.90 mg/mL. The change of D10, D50 and D90 was little when the mass concentration was in range of 0.01-0.10 mg/mL. The proper mass concentration for measurement was 0.01-0.10 mg/mL. The ultrasonic dispersing time should be more than 30 min. The stirring rate had no significant influence on the particle size measurement results of UFP. In addition, the results in eight measurements by LSA had high repeatability. The analysis results were consistent with the particle size distribution analyzed by SEM.
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