论文部分内容阅读
前处理方法的优化研究是促进激光粒度仪分析技术在南方红土区推广的关键环节。以黄土粒度前处理方法为基础,设定不同的H2O2、HCl和分散剂(Na PO3)6的加入剂量以及不同的反应温度和超声波震荡时间来处理采自云南高原程海地区海拔2000 m的碳酸盐岩红土样品,结果发现:(1)加入HCl处理会使激光粒度仪测量结果偏粗,不加HCl只加H2O2可以获得较细的粒度测量结果;(2)加(Na PO3)6分散剂后样品测试结果重现性较高,但粒度偏粗,当加入剂量超过5 ml(0.05 mol l-1)后加入剂量的多少对测试结果影响不大,未加(Na PO3)6的样品测试结果重现性差,但粒度总体偏细;(3)加热处理比未加热处理样品的粒度偏粗,加热不利于样品的分散;(4)经超声波震荡的样品较未震荡的样品颗粒分散程度高,但震荡时间超过2分钟后,增加震荡时间对分散结果影响不大。
Optimization of pretreatment method is the key to promote the popularization of laser particle sizer in the laterite area. Based on the pretreatment method of loess particle size, different dosage of H2O2, HCl and dispersant (Na PO3) 6, different reaction temperature and ultrasonic oscillation time were set up to treat carbon collected at 2000 m above sea level in Chenghai area of Yunnan Plateau The results showed that: (1) The measurement result of laser particle sizer was thicker with the addition of HCl, and the finer particle size measurement could be obtained without HCl plus H2O2 only; (2) NaPO3 6 dispersion After the test, the test results were reproducible, but the particle size was rather coarse. When the dosage exceeded 5 ml (0.05 mol l-1), the amount of the test sample added had little effect on the test result. The sample without NaPO3 6 Test results were poor, but the particle size was generally fine; (3) the heat treatment was thicker than that of the non-heat treated samples, and the heating was unfavorable for the dispersion of the samples; (4) the degree of dispersion of the ultrasonic vibration samples High, but the shock time of more than 2 minutes, increasing the shock time on the dispersion of little effect.