Patent ID: 6110349
Filing Date: 2000-08-29
Classification: C25C,C25D

Abstract:
A method for processing sludge generated by a halogen electrolytic tinplating process, said method comprising:a) leaching the sludge with water at a Ph of 7 or less;b) separating an iron-containing sludge remaining after said leaching step a) to obtain a resulting solution;c) alkalifying the resulting solution obtained in said separating step b) to precipitate tin-containing sludge;d) separating and recovering said tin-containing sludge precipitated in said alkalifying step c);e) redissolving said tin-containing sludge in an alkaline solution;f) electrolytically reducing said alkaline solution obtained in said redissolving step e); andg) reusing metallic tin recovered in said electrolytically reducing step f) as an anode for said halogen electrolytic tinplating process.