Applied Chemical Engineering

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

Nafisa Ulasheva

Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, 100170, Uzbekistan

Bakhrom Kucharov

Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, 100170, Uzbekistan

Aktam Erkaev

Tashkent Institute of Chemical Technology (TICT), Tashkent, 100011, Uzbekistan

Bakhtiyor Zakirov

Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, 100170, Uzbekistan

Mashkhurakhon Yulbarsova

Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, 100170, Uzbekistan

Davron Isabaev

Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, 100170, Uzbekistan

Erkin Israilov

Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, 100170, Uzbekistan

Surayyo Jumadullaeva

Institute of General and Inorganic Chemistry of the Academy of Sciences of the Republic of Uzbekistan, Tashkent, 100170, Uzbekistan

Gulnar Saparova

Nukus State Technical University, Nukus, 230100, Karakalpakstan

Atabek Kaipbergenov

Nukus State Technical University, Nukus, 230100, Karakalpakstan

Karjaubay Reymov

Nukus State Pedagogical Institute, Nukus, 230100, Karakalpakstan

Sardor Sherkulov

Karshi State Technical University, Karshi, 180119, Uzbekistan

Aziz Dustov

University of Economics and Pedagogy, Karshi, 180119, Uzbekistan

Odil Nazarov

University of Economics and Pedagogy, Karshi, 180119, Uzbekistan

Kakhramon Turayev

Karshi State Technical University, Karshi, 180119, Uzbekistan

Bakhodir Abdullayev

University of Economics and Pedagogy, Karshi, 180119, Uzbekistan

DOI: https://doi.org/10.59429/ace.v8i4.5804

Keywords: glaserite; schoenite; conversion; potassium chloride; evaporation

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Abstract

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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