分散性对激光粒度仪检测碳酸锂粒度分布准确性的影响

Effect of Dispersion on the Accuracy of Laser Particle Size Analyzer Detection of Lithium Carbonate Particle Size Distribution

采用马尔文激光粒度仪检测碳酸锂样品的粒度分布情况,并以D10、D50、D90为评价指标,研究超声分散时间、搅拌速度、分散剂、折射率、吸收率对碳酸锂粒度分布的影响。结果表明:超纯水-无水乙醇(1:1)体系分散效果略高于无水乙醇体系,但考虑能源循环利用因素,优选无水乙醇为分散剂。秉承节能降耗的理念,超声分散时间、搅拌速度优选临界值,分别为3 min、2500 r/min。因折射率、吸收率分别为1.59、0.1时,其粒度分布近标准正态分布,则折射率、吸收率优选此值。经重复性、中间性检测D10、D50、D90的相对标准偏差均小于3%,结合扫描电镜与激光粒度仪测试的粒度分布的高度一致性,表明该测试方法具有较高的稳定性,测试效果显著,利于推广。

The particle size distribution of lithium carbonate samples was detected by Malvern laser particle size analyzer,and D10,D50 and D90 were used as evaluation indicators to study the influence of ultrasonic dispersion time,stirring speed,dispersant,refractive index,and absorption rate on the particle size distribution of lithium carbonate.The results showed that the dispersion effect of the ultrapure water-absolute ethanol(1:1)system was slightly higher than that of the absolute ethanol system,but considering the energy recycling factor,the absolute ethanol was preferred as the dispersant.Adhering to the concept of energy saving and consumption reduction,the optimal critical values for ultrasonic dispersion time and stirring speed are 3min and 2500 r/min respectively.Since the particle size distribution is close to the standard normal distribution when the refractive index and absorptivity are 1.59 and 0.1 respectively,these values are preferred for the refractive index and absorptivity.The relative standard deviations of D10,D50 and D90 are all less than 3%through repeatability and intermediary testing.Combined with the high consistency of the particle size distribution tested by the scanning electron microscope and the laser particle size analyzer,it shows that the test method has high stability and test effect.Significant,conducive to promotion.