Plating rinse water treatment

Details Plating rinse water treatment Plating rinse water treatment

1994-06-02

1999-08-03

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

204237, 204DIG13, 205100, 210712, 210720, 210743, 210 961, 210101, 210167, 2101951, 210206, 210207, 210724, 210913, C02F 162

Patent

active

059321091

ABSTRACT:
Method and apparatus for handling water used in plating processes to eliminate discharge of pollutants including a plating tank for chrome plating selected materials, at least one rinse tank which holds rinse water where parts from the plating tank are rinsed to remove chrome compounds used in the plating tank and transfer means to transfer water from the rinse tank to a purification tank where hydrazine is added to the rinse water in quantities sufficient to maintain selected pH in the water returned to one of the rinse tanks for precipitation of the chromic compounds to chromic hydroxide which can be easily filtered for disposal as a dry material. High quality water such as deionized water is added to the rinse tank to makeup lost water and a catalyst such as cobalt salt can be added to the purification tank to assist in reduction of the chromic compounds.

REFERENCES:
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patent: 3681210 (1972-08-01), Zievers et al.
patent: 3714039 (1973-01-01), Lancy et al.
patent: 3826741 (1974-07-01), Nakamure
patent: 3835045 (1974-09-01), Hussissian
patent: 3973987 (1976-08-01), Hewitt et al.
patent: 4170554 (1979-10-01), Freshcorn
patent: 4171255 (1979-10-01), Tuznik et al.
patent: 4367213 (1983-01-01), Fiorucci et al.
patent: 4379031 (1983-04-01), Krotkiewicz et al.
patent: 5256306 (1993-10-01), Griffin

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