Abstract
The conducted studies on the concentration of brine from lakes Karaumbet and Barsakelmes under conditions close to industrial ones showed the possibility of obtaining practically pure sodium chloride and magnesium chloride melt. To do this, the evaporation process must be carried out in two stages. The evaporation to a density of 1.550 g/sm3 increases the content of magnesium chloride from 7.20% to 28.24%. At the same time, the content of sodium ions decreases from 8.05% to 0.91%. The evaporation at the first and second stages must be carried out to a density of 1.340-1.345 g/sm3, which contributes to the release of sodium chloride into the precipitate. The evaporation of the mother liquor makes it possible to obtain practically pure sodium chloride. The content of magnesium chloride after evaporation in the first stage is 15-16%.
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