Abstract: The invention relates to a process for preparing granulated potassium sulphate or potassium magnesium sulphate, characterized by comprising the following steps:(a) grinding the potassium sulphate or potassium magnesium sulphate(b) mixing the ground product of step (a) with a corresponding unground sulphate until a predetermined particle size distribution curve is obtained(c) treating the mixture of step (b) with a hot, saturated solution of a corresponding sulphate until a wet paste is obtained, and the final further steps of granulating said paste and drying the granulate thus obtained. The invention also relates to the products obtained in this manner.

Abstract: The invention relates to a process for recovering from potassium mineral flotation tailings sodium chloride of sufficiently high purity to make it suitable for industrial use, characterized by comprising the following stages:(a) washing said flotation tailings with water and with the mother liquor from one or more successive stages of the process, said mother liquor containing sodium chloride as undissolved bottoms, to give a mixture of a solid phase comprising nearly all the sodium chloride contained in said fed tailings, and a liquid phase(b) separating said mixture into a first turbid portion enriched in said solid phase, and a second turbid portion enriched in said liquid phase(c) separating the solid phase from the liquid phase of said first turbid portion, this latter separated phase constituting at least part of said mother liquor for use in stage (a), and possibly(d) drying the solid phase separated in stage (c) to produce high purity sodium chloride.