Process and apparatus for treating foundry sludge to recover...

Details Process and apparatus for treating foundry sludge to recover... Process and apparatus for treating foundry sludge to recover...

C - Chemistry, Metallurgy

22

B

C22B 3/10 (2006.01) C01D 3/08 (2006.01) C01F 5/30 (2006.01) C01F 11/48 (2006.01) C22B 3/44 (2006.01) C22B 7/00 (2006.01) C22B 26/22 (2006.01)

Patent

CA 2350726

Process and apparatus for recovering magnesium from foundry sludge and cell bleed electrolytes includes structure and/or steps for: (i) dissolving, in a water slurry, soluble chloride compounds in the magnesium-containing material; (ii) acidifying the water slurry to between substantially pH 4 and substantially pH 6; (iii) further acidifying the water slurry to between substantially pH 1 and substantially pH 0, and providing a magnesium chloride solution; (iv) precipitating calcium from the magnesium chloride solution; (v) separating solids from the magnesium chloride solution; (vi) stripping SO2 from the magnesium chloride solution; and (vii) precipitating NaC1 from the magnesium chloride solution to provide a concentrated magnesium chloride solution.

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