Abstract
In the course of studies on the particle size control of salt crystal and its secondary seed generation, the data on the particle size were found to be much affected by the water content in sample crystals and their pretreatment conditions. Therefore, using the samples with two different levels of water content, their particle sizes were tested under various pretreatment conditions, such as the washing quantity of alcohol, the number of washings and impact strength. As the results, it was confirmed that the cohesive phenomena among crystals take place and are influenced by pretreatment conditions, resulting in serious errors in the data. At start-up stage in a large particle size salt productuion system, the clear relationships had been observed between the cohesive crystallization and the factors such as crystal growth rate, production rate and surface area of crystal. From the experiments by a commercial plant, it was found that by using the cohesive crystallization phenomena, the salt production capacity is improved effectively, namely resulting in shortening of the operational time required for desired size of crystal and in higher yields at startup stage.
