A study of the process of evaporation of mother liquors formed during the production of double salts of glaserite and schoenite

This article presents data on the synthesis process of glaserite and schoenite through a two-stage transformation of astrakhanite. The first stage involves the initial conversion of astrakhanite, followed by a secondary transformation aimed at producing potassium sulfate. To facilitate the separation of sodium chloride and enhance the yield of potassium chloride in the final products, the evaporation behaviour of glaserite and schoenite mother liquors was investigated. During glaserite mother liquor evaporation, filtration at elevated temperatures results in the near-complete crystallisation of sodium chloride, while filtration at low temperatures almost entirely facilitates the crystallisation of mirabilite. This creates the potential for successful sodium chloride separation from the mother liquor and the creation of positive conditions for potassium sulfate recovery enhancement in the subsequent process steps. For the schoenite mother liquor, hot filtration following the evaporation leads to the solid phase being approximately 33.5% schoenite, 1.7% arcanite, 56.0% bischofite, 7.9% magnesium sulfate, and 11.8% unknown crystalline phases. The solid phase composition at the cold condition is significantly different from that of schoenite and arcanite, increasing to 54.8% and 27.6%, respectively. It is established that the solid material obtained by hot filtration of the schoenite mother solution is fit for the purposes in the processes of bischofite manufacturing, and the precipitate obtained by cold filtration can be used directly in the form of ready-to-use fertiliser.

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