A method for the production of pure for a magnesium - production of a suitable carnalite, - nacl - crystallisate from carnalite, brine

摘要

A method for the production of pure, for a magnesium - production of a suitable carnalite, - nacl - of the crystals obtained from cold carnalite, brine, characterized in that a crystallisate with a ratio of the components of mgcl₂:Kcl: nacl: caso₄ of 31,2: 24,5: 8,0: 0,5 (max.) by solution mining carnalite, obtained from a brine having a concentration ratio of approximately mgcl₂:Kcl: nacl: caso₄ of 31,5: 15: 53: 0,35 is produced by the following process steps in succession.(1) At the boiling point of concentration to a mgcl₂-Content of 270 to 300 g / l, cooling to 20 – 40°C. and separation of the crystallized kcl - nacl - crystallizate(2) From the evaporation of the mother liquor separated crystallized alkali metal chlorides, with the addition of pure potassium chloride and the recirculated carnalite, nut lye carnalite, saturation to the movement at boiling temperature, cooling to 20 to 40°C. and separation of the crystallized solid salts of the carnalite, nut lye(3) Separation of the crystallized solid salts of the process stage 2 in a roughly -, and a fine fraction, wherein the fine fraction, consisting of gypsum, nacl and carnalite, is discarded, whereas the coarse fraction, consisting of carnalite, centrifuged and nacl, dewatered and is supplied to the fused salt electrolysis..