METHOD OF PRODUCTION OF THE ARTIFICIAL CARNALLITE Russian patent published in 2007 - IPC C01F5/30 C01D3/04 

FIELD: chemical industry; methods of production of the artificial carnallite.

SUBSTANCE: the invention is pertaining to the method of production of the artificial carnallite. The method of production of the carnallite includes mixing of the heated concentrated solutions containing potassium and magnesium chlorides, with the potassium chloride in the mass ratio of the solution equal to MgCl₂:KCl = (3.2-7.9):1, cooling of the suspensions with crystallization, filtration the carnallite crystallizate, dissolution in the mother liquor at the temperature of 115°С of the waste electrolyte of the magnesium production and feeding of the produced solution for lixiviation of the magnesium chloride from the ore in the chamber of the underground lixiviation. Dissolution of the waste electrolyte of the magnesium production is conducted in the part of the mother liquor in the presence of the water or the sewage of the magnesium production containing magnesium, potassium, sodium chlorides for maintaining the water balance of the process of production of carnallite with reception of the solution containing 4-7 % of potassium chloride. The share of the magnesium chloride in the solution at the chamber outlet of the underground lixiviation is maintained at the level of 28-30 %.The solution received at the outlet of the chamber of the underground lixiviation is subjected to evaporation up to the share of MgCl₂ in it at the level of 30-33 % and feed for mixing with the suspension of potassium chloride in the remained heated mother liquor. The method increases the share of extraction of potassium from the raw materials and the recycling solutions into the target product.

EFFECT: the invention ensures the increased share of extraction of potassium from the raw materials and the recycling solutions into the target product.

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