Production of potassium sulphate from a mixture of sodium and magnesium sulphatesn and potassium chloride

Abstract Potassium sulphate has been produced by a batch process from a mixture of sodium and magnesium sulphates, and potassium chloride. The process is made attractive by the production of additional products — magnesium chloride and sodium sulphate —, by the recirculation of brines and by the recovery of potassium chloride from the brine circuit. Purities of products throughout can be controlled by slight circuit adjustments and/or by additional water washes. Flow sheets have been prepared and several cycles of operation have proven that the process is reliable.