A method for processing polyhalite for the purpose of the production of langbeinite, potassium sulfate and a liquid fertilizer

摘要

A method for the production of langbeinite and potassium sulfate from a solution, which, by leaching with water, washed and calcined polyhalite, separation of gypsum and clarification was made, characterized in that, the solution is concentrated by evaporation, wherein the pure langbeinite (2mgso₄ × K₂So₄) crystallized, which is separated and the clarified solution is cooled, with potassium sulfate crystallized, which likewise is separated and the solution, either to the bases of polyhalite used or after addition of a little water in order to avoid the formation of crystals is removed from the process and is used as the liquid complex fertilizers.