Method for removing sulfate ions from aqueous solution of alkali

Details Method for removing sulfate ions from aqueous solution of alkali Method for removing sulfate ions from aqueous solution of alkali

1990-10-31

1991-12-10

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210683, B01D 1504

Patent

active

050715631

ABSTRACT:
A method for removing sulfate ions from an aqueous solution of an alkali metal chloride is disclosed, in which the aqueous solution of the alkali metal chloride containing sulfate ions and zirconium hydrous oxide are brought into contact with each other in a slurry form under acidic conditions to thereby cause the sulfate ions to be adsorbed to the zirconium hydrous oxide by an ion exchange reaction, the zirconium hydrous oxide adsorbing sulfate ions is separated from the aqueous solution and then dispersed in another aqueous liquid to thereby cause it to react with an alkali so as to cause sulfate ions to be desorbed into the aqueous liquid. According to this method, adsorption and desorption take place rapidly and efficiently.

REFERENCES:
patent: 3332737 (1967-07-01), Kraus
patent: 4405576 (1983-09-01), Lee et al.
patent: 4415677 (1983-11-01), Lee et al.
patent: 4415678 (1983-11-01), Lee et al.
patent: 4488949 (1984-12-01), Lee et al.

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