Chromium recovery process

Details Chromium recovery process Chromium recovery process

1988-05-26

1990-08-28

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210684, 423 54, C02F 142

Patent

active

049523201

ABSTRACT:
A process for removal and recovery of chromium ions (chromate, dichromate, or combinations thereof) from aqueous waste water of surface treatment phosphatizing solutions and for recycling of the treated waste water following replenishment wherein the aqueous waste water is initially partially clarified in a settling tank, with the effluent then being passed through an ion exchange column for removal of substantially all of the chromium ions therefrom. Following treatment in the ion exchange resin column, the chromium-free material is recharged with a supply of fresh chromium ions until the chrome ion content is at the desired level for metal surface treatment. The spent ion exchange resin columns are removed and replaced, as necessary, with the recharge of the resin columns making additional chromium available as a resource.

REFERENCES:
patent: 3951811 (1976-04-01), Casolo et al.
patent: 4012318 (1977-03-01), Hayashi

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