The aim of the work is determination of production temperature and salt regimes for an industrial threevessel vacuum evaporation unit for concentrating magnesium chloride solution, included within technology for artificial carnallite preparation. A scheme is provided, and a unit developed and manufactured for this purpose is described. Experimental data are provided that were obtained during magnesium chloride solution concentration within a single-tube evaporation unit with a descending film (unit) under different regimes. A distribution device is selected for provision of stable film flow over the inner surface of a heatexchange tube. The possibility is confirmed by experiment for the first time of using equipment with a descending film for concentrating actual magnesium chloride solution. Data are obtained for the limiting salt content within the concentrated solution providing operation of the unit in a crystallization-free regime.The Russkii Magnii company entered into construction of a plant for preparation of magnesium metal. One of the semi-finished products of magnesium production is synthetic carnallite. For the production process of magnesium chloride solution, obtained during salt-acid leaching of serpentinite, before supply for synthesis of artificial carnallite it is concentrated in a three-vessel vacuum-evaporation unit (VEU) fitted with evaporation equipment with a descending film.Magnesium chloride solution is a complex multicomponent system of the following chemical composition, wt.%: MgCl 2 -20.06; CaCl 2 -0.42; NaCl -1.2; KCl -1.39. The composition of concentrated solution (in wt.%) is: MgCl 2 -34.5; CaCl 2 -0.72; NaCl -2.08; KCl -2.4. During concentration by a factor of 1.72-1.73, salt crystals do not separate from the solution.Experience of industrial operation of a VEU shows that under actual production conditions quite broad deviations of compositions from regulated values are possible for the solutions being processed, which leads to over-evaporation of solutions and separation of crystals on the heat-transfer surfaces of heating pipes and other internal surfaces of the evaporation equipment in the form of solid incrustations. In addition, presence within a solution of calcium and silicon compounds under
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