Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1980-06-11
1982-03-23
Cintins, Ivars C.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210685, 210177, 210904, 422234, 423236, 423371, B01J 4704
Patent
active
043211453
ABSTRACT:
Ion exchange techniques are utilized to treat waste water flows, especially those from plating baths, by passing the waste water through a multi-level ion exchange resin bed, the bed thereafter being regenerated by a series of steps, including backwashing, passage of an acidic regeneration fluid through the bed, multi-stage rinsing of the bed, and passage of a caustic regeneration fluid through at least a portion of the bed. Acidic waste flows developed during regeneration steps are, when desired, further treated to recover cyanide values therefrom by heating same within a generally closed tank to drive off a hydrocyanic gas, which is then reacted with caustic within a circulation reactor having an inclined passageway in order to form and recover a cyanide salt liquor suitable for re-use in the plating bath.
REFERENCES:
patent: 897735 (1908-09-01), Goldberg
patent: 3359199 (1967-12-01), Schmidt
patent: 3658470 (1972-04-01), Zievers et al.
patent: 3719591 (1973-03-01), Crits
patent: 3744977 (1973-07-01), Scott
patent: 3984314 (1976-10-01), Fries
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