激光粒度分析和筛分法测粒径分布的比较

分别采用筛分法和马尔文激光粒度分析仪两种方法对16种颗粒的粒径分布进行了测量。通过比较,发现两种测量手段得到的粒径分布结果存在较大的差异,马尔文激光粒度方法对颗粒粒径的测量结果偏小,受颗粒形状的影响很大;筛分法对微细颗粒的测量误差较大,但对大粒径颗粒的测量较为准确。通过对不同粒径段灰颗粒的显微照相,发现细颗粒的团聚是筛分法测量小颗粒结果偏小的主要原因。

Measurement Results Comparison Between Laser Particle Analyzer and Sieving Method in Particle Size Distribution

In order to compare the difference between the Malvem laser analyzer and the sieving method in particle size distribution measurement, as many as 16 samples of CFB fly ash were measured by both methods respectively. The results from different methods showed a great diversity. The percentages ofultrafine particles obtained with laser analyzer are overestimated. This is considered to be due to the shape of particles. On the other side, the sieving method showed great errors in the measurements of small-sized particles, but more precise in the measurement of bigger particles. Micrography of particles with different size regio n w ere taken, which proved that the conglomeration of small particles was the main reason why results were smaller in the measurements of small-sized particles with the sieving method.