Removal of sulfate ions from saline solutions comprised thereof

Details Removal of sulfate ions from saline solutions comprised thereof Removal of sulfate ions from saline solutions comprised thereof

1994-10-06

1996-07-16

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210683, B01D 1500

Patent

active

055364152

ABSTRACT:
Contaminating amounts of sulfate ions are removed from aqueous saline solutions comprised thereof by (i) contacting such saline solution with a zirconium compound, at an acidic pH, (ii) separating the resulting medium into (a) a saline solution depleted in sulfate ions and (b) a zirconium compound onto which said sulfate ions are sorbed, (iii) desorbing the sulfate ions from the stage (ii) zirconium compound at a basic pH, and (iv) separating the medium of desorption into (1) a basic aqueous solution enriched in sulfate ions and (2) a zirconium compound substantially devoid of sulfate ions, with the proviso that the zirconium compound is a novel hydrated zirconium hydroxide having the formula Zr(OH).sub.4 .multidot.xH.sub.2 O, in which x ranges from 4 to 200, and such zirconium compound comprising an undried gelatinous precipitate thereof.

REFERENCES:
patent: 5071563 (1991-12-01), Shiga et al.

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