Process for processing waste solution containing ammonium ions a

Details Process for processing waste solution containing ammonium ions a Process for processing waste solution containing ammonium ions a

1985-04-01

1987-04-07

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210677, 210681, C02F 104, C02F 142

Patent

active

046559299

ABSTRACT:
In a process for processing a waste solution containing ammonium ions and fluoride ions to recover ammoniacal water and anhydrous hydrogen fluoride, the waste solution is treated with a strong acid type ion exchange resin to separate ammonium ions; the resin is eluted with hydrochloric acid to recover ammonia as ammonium chloride; the effluent is distilled with addition of concentrated sulfuric acid to recover hydrogen fluoride; the remaining diluted sulfuric acid is concentrated and recycled to the hydrogen fluoride recovery step; the ammonium chloride solution is distilled with addition of magnesium hydroxide to recover ammonia water; the remaining formed magnesium chloride is thermally decomposed into hydrochloric acid and magnesium hydroxide, which are recycled to the regeneration of the ion exchange resin and the treatment of the ammonium chloride solution respectively.

REFERENCES:
patent: 3475330 (1969-10-01), Gilles
patent: 3870033 (1975-03-01), Faylor et al.
patent: 4234419 (1980-11-01), Coillet

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