C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 25/234 (2006.01) B01J 39/16 (2006.01) C22B 19/30 (2006.01) C23C 22/86 (2006.01)
Patent
CA 2114297
METHOD FOR DISSOLVING SLUDGE AND RECOVERING CONSTITUENTS THEREFROM ABSTRACT OF THE DISCLOSURE The present invention provides a method for dissolving slightly soluble sludge which is produced during chemical conversion coating of metal, which comprises agitating the sludge in an aqueous suspension containing hydrogen type strongly acidic cation exchange resin; exchanging metallic components in the sludge with the resin and adsorbing the metallic components on the resin; dissolving oxyacid components in the sludge into liquid phase, and recovering the metallic components from the resin and the oxyacid components from the solution. The sludge can be dissolved by simple operation and equipment, and effective components in the sludge can be recovered at high yield. The method contributes to effective re-utilization of resources and to prevention of environmental pollution and makes it possible to use the resin semipermanently by regenerating the used ion exchange resin.
Fetherstonhaugh & Co.
Iwamoto Yukiyoshi
LandOfFree
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