RECRYSTALLIZATION PROCESS FOR THE UPGRADING OF ROCK-AND SOLAR SALTS

摘要

The recrystallization process is a known, but until now little used process in salt plants. It can be applied in cases, where the raw material is present in the solid form (rock- and solar salt). Compared to other vacuum salt processes, recrystallization requires lower specific energy consumption (steam, electricity). A further significant characteristic is the high vacuum salt quality, which can be achieved almost without the addition of chemicals. Raw salts with a large portion of natural impurities, can be economically converted into a high-purity product. The recrystallization process belongs to the category of the adiabatic flash evaporation processes. A hot, saturated brine will be led into several flash crystallizers working on different pressure levels. Supersaturation is achieved in the vacuum crystallizers by simultaneous evaporation and adiabatic cooling of the brine feed, and subsequently the production of crystallized salt will start.