METHOD FOR PRODUCTION OF MAGNESIUM SULFATE Russian patent published in 1998 - IPC

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