Residue-free processing of carnallitic crude potassium salts from conventional mining degradation method, comprises e.g. milling the carnallitic crude salt, contacting with cold water and dissolving carnallite

摘要

Residue-free processing of carnallitic crude potassium salts from conventional mining degradation method, comprises milling the carnallitic crude salt to a grain size of less than 10 mm, preferably less than 8 mm, contacting with cold water at a solution temperature, dissolving carnallite, halite, optionally sylvite (potassium chloride) and other soluble potash mineral, separating the solvent residue from chloride-free kieserite and anhydrite, evaporating, cooling to obtain magnesium sulfate-rich kieserite as magnesium sulfate concentrate or as a salable additional product. Residue-free processing of carnallitic crude potassium salts from conventional mining degradation method, comprises milling the carnallitic crude salt to a grain size of less than 10 mm, preferably less than 8 mm, contacting with cold water at a solution temperature of 5-25[deg] C, preferably less than 15[deg] C within 15 minutes, preferably 8-10 minutes, completely dissolving carnallite, halite, optionally sylvite (potassium chloride) and other soluble potash mineral in the form of a chloride-based solution, separating the solvent residue from chloride-free kieserite and anhydrite, evaporating, cooling to processed salable potassium chloride, sodium chloride and a concentrated magnesium chloride solution to obtain magnesium sulfate-rich kieserite as magnesium sulfate concentrate or as a salable additional product. The amount of potassium chloride, magnesium chloride and sodium chloride are in the same ratio as in the crude salt.