Where is the nucleation and crystallization area in vacuum salt production?
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I think it crystallizes during the process of sinking to the salt bottom; some people say it crystallizes within the salt bottom. So where exactly does crystallization take place?
Nucleation first requires supersaturation, which generally occurs at the evaporation interface, that is, at the top of the liquid level in the evaporation tank. During the evaporation and concentration process, the crystal nuclei gradually grow; once they reach a certain size, they fall into the salt leg. Of course, if the concentration of the brine used in the salted leg area is high and there is a large temperature difference with the liquid surrounding it, crystal nuclei can also form at the concentration gradient interface; however, the amount of such nuclei is generally small.