Abstract
This article presents the results of research of the process of cleaning magnesium chloride solution potash production from impurities of potassium chloride and sodium- cooled lighted solution after separation kainite and for the sulfates the evaporation to getting a suspension of finely dispersed sulfate salts (kieserite, langbeinite) in a concentrated solution of magnesium chloride, cooling, which leads to the crystallization of magnesium chloride. At the expense of differences in size, structure and energy of crystals of sulfate minerals and hydrated magnesium chloride different crystalline phases and separated by hydrodynamic method have been formed. The suspension of finely dispersed sulfate minerals with solution have been returned on crystallization kainite and thickened sediment hydrated magnesium chloride has been filtered on a centrifuge to produce a finished product
Highlights
IntroductionProduction of sulfate potassium-magnesium fertilizer is based on polymineral potassium ores which contain potassium chloride
Production of sulfate potassium-magnesium fertilizer is based on polymineral potassium ores which contain potassium chloride and potassium-magnesium minerals is associated with their dissolution in the circulation solutions and crystallization from a saturated solution of schoenite (K2SO4·MgSO4·6H2O)
The hydration of hardly soluble langbeinite in the presence of potassium chloride with formation of magnesium chloride occurs by the reaction equation: 2 [K2SO4·2MgSO4] + 2KCl + 18H2O =3[K2SO4·MgSO4·6H2O]+
Summary
Production of sulfate potassium-magnesium fertilizer is based on polymineral potassium ores which contain potassium chloride Purifying from chlorides is carried out by dissolving MgCl2 with the intermediate precipitate the liquid phase is evaporated under vacuum at a temperature of 353 K for separation sediment carnallite and sodium chloride, which is returned to the process, and a temperature of 393 K - for crystallization kieserite. Dispersed suspension processing by solution of polyelectrolyte for sedimentation finely dispersed kieserite phase, the precipitate is filtered and cooled liquid phase, separating a mixture of carnallite and sodium chloride, which is returned to the process, get the magnesium chloride solution with a concentration 36.6% MgCl2, 0.58% (NaСl +KСl), 1.66% MgSO4 [18].
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