A Study on Increase in Crystal Growth Rate of Sodium Chloride Caused by Adhesion of Suspended Fine Crystals in Mother Liquid
2007 Volume 61 Issue 1 Pages 29-33
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2007 Volume 61 Issue 1 Pages 29-33
The effect of the number of suspended fine crystals in a mother liquid on the crystal growth rate of sodium chloride was studied using a fluidized-bed-type crystallizer, as a fundamental study for obtaining a high crystal growth rate. In the experiment, the increase in crystal weight caused by crystal growth was regarded as proportional to the elapsed time. The relationship between the number of fine crystals in the mother liquid and the ratio of the weight increase rate to the super-saturation was almost as linear. Therefore, the crystal growth rate basis on mass can be expressed as (dw/dt)av=(A+BNfine)Δ C. In addition, the effect of the high crystal growth rate on the amount of liquid inclusion was studied. Concerning the crystal products of every experimental condition, the difference of the decrease in crystal weight at 873K and at 413K was measured and regarded as the weight of water in the liquid inclusion. Concerning the results of the experiments, the increase in growth rate scarecely affected the weight of liquid inclusion in the crystal products.
