【摘要】 利用5LMSMPR结晶器,通过改变停留时间、过饱和度和搅拌速度等因素,对硝酸钾结晶的粒度分布、平均粒径、主粒径、成核及生长速率等动力学特性进行了研究,并在结晶温度25℃、过饱和度2℃、搅拌速度400r/min和停留时间10～50min条件下,建立了硝酸钾晶体生长动力学模型:B°=6.19×1022G2.02。研究结果表明:当停留时间大于30min、搅拌速度为400r/min时,晶体的平均粒径和主粒径较大;过饱和度的减小也会使晶体粒径增大,但其影响较小。更多还原

【Abstract】 Making use of 5 L of MSMPR crystallization device and by changing in residence time, supersaturation and rate of agitation, the kinetics properties ,such as particle size distribution,average grain size, main grain size, nucleation rate and growth rate of KNO₃ crystal in the experiments were studied. And in such conditions that the crystal temperature was 25 ℃, the supersaturation was 2 ℃, the rate of agitation was 400 r/min and the residence time changed from 10 min to 50 min, the kinetics model of crystal growth of potassium nitrate was set up:B°=6.19×10²²G^2.02.The experimental results showed that when the residence time was more than 30 min and the rate of agitation was 400 r/min, the average particle size and the main particle size of the crystal were larger; the decreasing of supersaturationcould make the particle size increasing but the influence was small.更多还原