磷肥副产硅胶的粒径分析条件选择

Condition Selection for Particle Size Analysis of Silica Gel Byproduct in Phosphorous Fertilizer Production

利用激光粒度分析仪(湿法)对磷肥副产硅胶进行粒径测定研究,主要考察了几种不同类型表面活性剂及其添加量、遮光率(样品浓度)、循环速率(搅拌速率)和超声时间(分散时间)等因素的影响,采用响应曲面法,建立遮光率的回归模型,优化得到最适宜分散效果的条件。结果表明,磷肥副产硅胶粒径分析的测定条件为:分散剂为三聚磷酸钠,添加量为4滴,遮光率为30%,循环速率为1 200 r/min,超声时间为3 min。该方法简捷、快速、准确度高且重现性好。

With laser particle size analyzer（wet-process）,the particle size of silica gel,a byproduct in phosphorous fertilizer production,was measured.The influences of several factors were studied,such as different types of surface-active agents and their dosage,shading rate（sample concentration）,cycle rate（stirring rate）,ultrasound time（dispersion time）,etc.Response surface method（RSM）was employed in this paper,a second order quadratic fitted regression equation for shading rate（sample concentration） was built in order to optimize the conditions for the dispersion effect.The optimum conditions for particle size analysis were obtained.Sodium tripolyphosphate was chosen as dispersion agent,its dosage was 4 drops,and sample concentration was 30%,cycle rate was 1 200 r /min,ultrasonic time was 3 min.This method is simple and rapid with high accuracy and good reproducibility.