Method for the recycle treatment of waste water from chromium pl

Details Method for the recycle treatment of waste water from chromium pl Method for the recycle treatment of waste water from chromium pl

1975-03-31

1977-03-15

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 37B, C02B 120, C02B 142, C02B 156

Patent

active

040123189

ABSTRACT:
A method for the recycle treatment of chromium plating waste water, in the process of treating chromium plating waste water obtained by washing the chromium plated products with ion exchange resins, wherein, for the purposes of improving the rate of recovery of chromic acid, of extending the life of the ion exchange resins, and of preventing the formation of sludge, the chromium plating waste water is adjusted almost to neutrality by the addition of an alkaline substance so as to precipitate the metal components contained therein in the form of hydroxides, which are then removed by filtration; the filtrate so obtained is kept neutral during the subsequent treatment for the removal of alkaline components by adsorption in a pretreatment tower packed with cation exchange resins; the dilute dichromic acid solution so obtained is similarly treated for concentration in an adsorption tower packed with anion exchange resins and a purification tower packed with cation exchange resins so as to recover pure dichromic acid solution, whereas the above pretreatment tower and purification tower are regenerated by treatment with sulfuric acid.

REFERENCES:
patent: 3575854 (1971-04-01), Richards
patent: 3642616 (1972-02-01), Burns
patent: 3658470 (1972-04-01), Zievers et al.
patent: 3664950 (1972-05-01), Saraceno et al.
patent: 3736253 (1973-05-01), DeAngelis et al.

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