Patent ID: 6409980
Filing Date: 2002-06-25
Classification: C01D,C01F,C01P,C22B,Y02P

Abstract:
A method for recovering a concentrated magnesium chloride solution from a magnesium-containing material, comprising the steps of:dissolving, in a water slurry, a magnesium-containing material comprising magnesium, calcium, NaCl, SO2, and solids; performing a first step for acidifying the water slurry to between substantially pH 4 and substantially pH 6; performing a second step for acidifying the water slurry to between substantially pH 1 and substantially pH 0, thereby providing a magnesium chloride solution; precipitating calcium from the magnesium chloride solution; separating solids from the magnesium chloride solution; stripping SO2 from the magnesium chloride solution; and precipitating NaCl from the magnesium chloride solution, thereby providing a concentrated magnesium chloride solution.