Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Treating process fluid by means other than agitation or...
Reexamination Certificate
2006-01-10
2006-01-10
Phasge, Arun S. (Department: 1753)
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Treating process fluid by means other than agitation or...
C204S237000, C204S528000, C204S529000, C204S531000
Reexamination Certificate
active
06984300
ABSTRACT:
The present invention provides means for recovering and reusing useful component ions in electrolytic phosphate chemical treatment bath without subjecting them to waste water treatment. In the present invention, a phosphate chemical treatment bath which contains phosphate ions and phosphoric acid, metal ions that form a phosphate crystal to provide a film, metal ions that are reduced from cations in the solution to form a film as metals, and ions that are involved in the reaction of the above-mentioned phosphoric acid and various metal ions to form a film, but which does not substantially contain ions that are not involved in film formation, is used as the phosphate chemical treatment bath. The aqueous solution in the washing water tank with which phosphate chemical treatment liquid adhered to the treated article after chemical treatment is contacted for dilution and washing, is subjected to electrodialysis, and useful components in said aqueous solution are thereby recovered and returned to the chemical treatment bath.
REFERENCES:
patent: 5645706 (1997-07-01), Matsuda
patent: 2002/0162752 (2002-11-01), Matsuda et al.
patent: 2002-322593 (2002-11-01), None
Matsuda Shigeki
Nishiya Shin
DENSO Corporation
Harness Dickey & Pierce PLC
Phasge Arun S,.
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