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Abstract�� 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.

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Received 2010-07-15; published 2010-07-15

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��»�;��;��־��;��ɼ;.�׷ʸ��轺��ѡ��[J]. ��ѧ��ҵ�빤��, 2010,27(4): 323-328

LI Yong-hui1,MING Da-zeng2,LI Zhi-xiang2,DU Lu-shan1.Condition Selection for Particle Size Analysis of Silica Gel Byproduct in Phosphorous Fertilizer Production[J]. Chemcial Industry and Engineering, 2010,27(4): 323-328