七钼酸铵连续式结晶工艺优化研究

STUDY ON THE CONTINUOUS CRYSTALLIZATION OF AMMONIUM HEPTAMOLYBDATE PROCESS

本文对连续式制备七钼酸铵工艺进行了优化研究,在工艺研究的过程中,以七钼酸铵粒度为评价指标,利用单因素实验,对影响七钼酸铵粒度的因素进行分析,确定主要影响因素,随后利用Box-Behnken响应面法系统研究工艺参数对粒度的影响,得出最佳的制备工艺条件为:进料密度1.394 g/mL,搅拌速度125 r/min,外循环流量565 L/min,结晶温度为22℃。在此条件下进行3次平行实验,得到七钼酸铵粒度的平均值为408.6μm。

The process of continuous preparation of a m m o n i u m heptamolybdate was optimiammonium heptamolybdate as evaluation index,the influencin/ factors were analyzed by Single factor test to deter-mine the main influencing factors. The effect of process parameters in continuous crstallization processticle size was systematically studied. The optimum preparation process conditions were obtained throughBehnken resjoonse surface： feed density of 2. 394 /mL ,stirrin / speed of 125 r/min,outer loop flow of 565 L/min and crystallization temperature of 22 C . The average particle size of a m m o n i u m heptamolybdate was 408. 6 ! m in the preparation process condition through three parallel experiments.