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Determination of Arizona Test Dust Particle Size Distribution by Malvern Laser Particle Size Analyzer
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摘要: 马尔文激光粒度仪是常用的测量亚利桑那试验粉尘粒径分布的仪器，采用马尔文激光粒度仪（MS2000）干法和湿法两种方式分别对样品粒度分布进行测试表征。结果发现，对于不同粗细的颗粒物，干法测试结果重复性好，但样品使用量大；湿法测试虽然使用样品量小，但当样品中存在较大粒径颗粒物时，大粒径的颗粒物在溶液中容易沉降，不易混匀，很难被吸进检测器，导致测量结果重复性较差，测试得到的累计粒度分布百分数达到50%所对应的粒径（D50）与干法比较相差较大。通过将A2尘研磨加工，使其粒径分布范围由 1 ~ 100 μm缩小至约为 1 ~ 50 μm，发现湿法测试重复性得到很大改善，与干法相当，且D50也与干法很接近。Abstract: Malvern Laser Particle Size Analyzer is a commonly used instrument to measure the particle size distribution of Arizona test dust. The sample size distribution was characterized by both dry and wet methods using Malvern Mastersizer (MS2000). The results show that for different particle sizes, the dry method results have good repeatability, but the sample was used in a large amount. Although the wet test uses a small amount of sample, when there are large particle sizes in the sample, the large particle sizes tend to settle in the solution and are not easily mixed, making it difficult to be absorbed into the detector, resulting in poor repeatability of the measurement results, and the particle size (D50) corresponding to the cumulative percent size distribution up to 50% of the test obtained was significantly different from that of the dry method. By grinding A2 dust to reduce the particle size distribution from 1～100 μm to 1～50 μm, the repeatability of the wet test was greatly improved and was comparable to that of the dry method, which is close to that of the dry method, including the D50.
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Key words:
- Arizona dust /
- large particle /
- laser particle size analyzer /
- dry method /
- wet method.
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图 1 A2试验粉尘湿法测试结果
注：图a、b、c中D50分别为11.26μm、13.87μm和16.88μm；图d为图a、b、c归一化拟合图。
Figure 1. Test results for A2 dust by wet method
图 2 A2试验粉尘干法测试结果
注：图a、b、c中D50分别为6.60μm、6.61μm和6.66μm
Figure 2. Test results for A2 dust by dry method
表 1 实验仪器及材料
Table 1. Experimental equipment and materials
序号 名称 型号 生产厂家 用途 1 行星球磨机 PM100 德国RETSCH 研磨、破碎 2 瓷球 2mm；3mm 德国RETSCH 研磨、破碎 3 马尔文激光粒度仪 MS2000 Malvern Panalytical 样品粒径测试 4 标准筛 300目；500目 绍兴市上虞华丰五金仪器有限公司 筛分样品 
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