Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1997-04-01
2000-08-29
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210681, 423121, 423181, B01D 1504
Patent
active
061103772
ABSTRACT:
The invention concerns a process that uses an ion exchanger resin to recover the sodium contained in industrial alkaline waste and, in particular, in the "red mud" and sodium effluents coming from the manufacture of aluminum hydrate according to the Bayer process. It includes putting the alkaline resins (1), usually "red mud" in the form of an aqueous suspension in contact with an RH.sup.+ type cationic resin, preferably, a carboxylic resin to attach the sodium selectively and quantitatively to the resin (5) and then to extract it quantitatively in the form of NaOH (8) by displacement using a lime suspension (6), preferably, lime milk. The resin (9), after attaching the calcium, is then regenerated for reuse at the beginning of the process (2) by elution of the calcium as CaCl.sub.2 (12) with a diluted hydrochloric acid solution (10).
REFERENCES:
patent: 4133866 (1979-01-01), Lakatos et al.
patent: 4172783 (1979-10-01), Adams et al.
Database WPI, Week 8243, Derwent Publications, Ltd., AN 91156, XP002019139 & JP 57 149 805 A (Showa Keikinzoku KK), Sep. 16, 1982.
Aluminum Pechiney
Cintins Ivars
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