FIELD: agriculture; production of detergents. SUBSTANCE: magnesite pulp (ratio of solid and liquid phases in it being 1:6.5-7) is fed for interaction with sulfuric acid, ratio of MgO and H2SO4 being 1:2.5-2.6. Said interaction is carried out at 85-90 C till pH is 6.5-7.5. Then solution is separated of slime, the process takes place by filtration which is followed by cooling solution to temperature being lower than 15 C. As this takes place MgSO4•7 H2O, is crystallized of solution, crystals of magnesium sulfate are separated of mother solution and then are dried in drying drum at 130-160 C. Mother solution is fed for evaporation and drying into separate device in which anhydrous product comprising 28-30 % of MgO. EFFECT: improved efficiency of the method. 2 cl
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Authors
Dates
1998-02-20—Published
1996-11-13—Filed