Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Preparing single metal
Patent
1998-10-13
2000-08-29
Valentine, Donald R.
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Preparing single metal
C25C 114
Patent
active
061103497
ABSTRACT:
Improved recovery of tin from sludge formed during a halogen-type electrolytic tinplating of steel sheet comprises leaching the sludge with water at a pH of 7 or less, separating an iron-containing sludge remaining after the leaching, alkalifying the filtrate obtained in the first separation step to deposit tin-containing sludge, separating and recovering the tin-containing sludge deposited in the first alkalifying step, redissolving the tin-containing sludge in an alkaline solution, and electrolytic reduction of the alkaline solution. High purity metallic tin is recovered from sludge, at a high yield. Other materials are also recovered for reuse from the filtrate and precipitation, which are formed during the process, without pollution of the operational environment.
REFERENCES:
patent: 1511590 (1924-10-01), Butterfield
patent: 3907653 (1975-09-01), Horn
patent: 4006213 (1977-02-01), Fisher et al.
patent: 4737351 (1988-04-01), Krajewski et al.
patent: 5766440 (1998-06-01), Ino et al.
Ishikawa Fuyuhiko
Kawamura Katsuhito
Kawashima Shinji
Sambonchiku Kazumitsu
Ukena Toshimichi
Kawasaki Steel Corporation
Valentine Donald R.
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