Process for producing potassium sulfate from potash and...

C - Chemistry – Metallurgy – 01 – D

Patent

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C01D 5/00 (2006.01) C01D 5/08 (2006.01)

Patent

CA 2343952

The present invention provides a process for producing potassium sulfate from a potash and a sodium sulfate source, comprising the steps of: (a) treating a portion of the potash source and sodium sulfate source, such that glaserite is crystallized out of solution and a first mother liquor is produced; (b) converting the glaserite to precipitate potassium sulfate in a second mother liquor; (c) recycling the second mother liquor to the portion of the potash source and sodium sulfate source; (d) subjecting the first mother liquor to evaporative crystallization to produce sodium chloride in a third mother liquor; and (e) recycling the third mother liquor to the portion of the potash source and sodium sulfate source.

La présente invention porte sur un procédé de production de sulfate de potassium à partir d'une source de potasse et de sulfate de sodium. Ce procédé consiste à: (a) traiter une portion de la source de potasse et de la source de sulfate de sodium de façon à séparer la glasérite de la solution par cristallisation et à obtenir une première solution mère; (b) transformer la glasérite pour précipiter le sulfate de potassium en une deuxième liqueur mère; (c) recycler la deuxième liqueur mère dans la portion de la source de potasse et de la source de sulfate de sodium; (d) soumettre la première liqueur mère à la cristallistion par évaporation de façon à produire du chlorure de sodium dans une troisième liqueur mère; et (e) recycler la troisième liqueur mère dans la portion de la source de potasse et de la source de sulfate de sodium.

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