控制参数对粉土粒度测量的影响

Effect of control parameters on particle size analysis of silt

利用Mastersizer 2000激光粒度仪测定河南商丘粉土的粒度,研究样品浓度、泵速、超声预分散、分散介质、样品的光学系数等控制参数对测试结果的影响.结果表明,粉土光学系数的选择对其影响不大;样品浓度在0.9～1.3 g·L-1和泵速在2 500～3 000 r·min-范围内,其结果具有较高的重复性;分散是保证其结果准确性的必要条件,合适的超声分散条件为端位移20、分散时间15 min;分散介质对其结果影响较大,该粉土在水中的测试结果要小于在无水乙醇中所测的结果.

This paper studied the factors affecting the accuracy of silt particle size analysis by using Mastersizer 2000 laser particle size analyzer. These factors were concentration, pump and stirrer speed, pre dispersion of ultrasonic, dispersion medium and optical properties of sample. The results show that there is little influence on particle size for optical index of silt. When sample concentration is in the range of 0. 9 to 1. 3 g · L^-1, and bump speed set between 2500 and 3000 r·min^-1, the results with good repeatability are obtained. Dispersion is very important for the accuracy of particle size analysis, the suitable operating dispersing conditions using ultrasonic for Shangqiu silt are 20 for displacement value and 15 minutes for ultrasonic time. The medium diameter of silt determined in distilled water is smaller than that in ethanol, which shows that dispersion medium is another important factor for the results. 1 tab, 9 figs, 6 refs.