Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Treating process fluid by means other than agitation or...
Patent
1996-02-20
1998-06-16
Gorgos, Kathryn L.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Treating process fluid by means other than agitation or...
204DIG13, 205101, 210710, 210724, 210904, 210912, C25D 2118
Patent
active
057664404
ABSTRACT:
The present invention is to provide a method for treating sludge as a by-product of a process of tin electroplating a steel plate by means of a plating bath containing haloid ions, together with an equipment therefor. More specifically, by immersing the sludge in water prior to filtration, the residual sludge is subjected to alkali hydrolysis in the presence or absence of the ions of an alkali earth metal within a temperature range of 100.degree. to 400.degree. C., whereby cyanide compounds and fluoride compounds contained therein under environmental regulations are prepared into environmentally non-hazardous matters. By adjusting the filtrate to pH 7.5 to 10, the precipitate with the principal component of tin hydroxide is deposited to recover the tin components contained in the sludge. Furthermore, the recovered tin is refined into the metal tin, for recycling and use as the electrode by the plating.
REFERENCES:
patent: 3907653 (1975-09-01), Horn
patent: 4006213 (1977-02-01), Fisher et al.
patent: 4219390 (1980-08-01), Stuart et al.
patent: 5451323 (1995-09-01), Akao et al.
patent: 5538617 (1996-07-01), Steinbicker et al.
Ino Takayuki
Ohnishi Akifusa
Shimizu Takao
Gorgos Kathryn L.
Kawasaki Steel Corporation
Leader William T.
Miller Austin R.
Nihon Parkerizing Co. Ltd.
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