In isothermal conditions have been studied the influence of system solution sea salts during their evaporation and crystallization to composition of received liquid and solid phases. It is shown that evaporation of the solution leading to its supersaturation by sulfate salts. In the liquid phase before crystallization of kainite concentration of SO 4 2ions increases to 10% and above. Through this probability of formation of crystals increases and the result of evaporation is the formation of

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... ely dispersed kainite. During crystallization of kainite concentration of SO 4 2in the liquid phase decreases rapidly. Decreasing its intensity increases with increasing value k=E SO 4 2-: E Mg 2+ of initial solution. For the degree of evaporation of 20.0% and 31.0% concentration of SO 4 2in evaporated solution on the value of k does not change. Most forms of potassium salts in the solid phase for the value k=0.7573 and reaches a maximum value at 82% evaporation rate of 31%. With the increasing degree of evaporation of the solution the degree of separate of SO 4 2in solid phase also increases. Most of the value achieved the degree of evaporation of the solution is 31% and about 90% for all values of k. This is an increase of salting action of MgCl 2 of liquid phase at kainite.