in water byproducts: CaSO4; aq. suspension of dolomite was treated with SO2-containing gas with formation of sol. sulfites, air was passed through the soln. forming the sulfates, Ca was removed as CaSO4;; MgSO4-soln. obtained;;
in neat (no solvent) reaction of MgO with SO2Cl2 vapor at room temp. formed slowly MgSO4 besides little of MgCl2; increasing the temp. increases the yield of MgCl2 (at 500 °C the ratio chloride/sulfate is 1/1);;
