Process for recovering zinc phosphating make-up feed from zinc p

Details Process for recovering zinc phosphating make-up feed from zinc p Process for recovering zinc phosphating make-up feed from zinc p

1993-04-09

1994-12-27

Lewis, Michael

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iib metal

423 99, 423101, 423102, 423142, 423592, C23C 2207

Patent

active

053763424

ABSTRACT:
A process for recycling a zinc phosphating system sludge comprising forming a mixture of the sludge with water and phosphoric acid. The mixture is formed at an elevated temperature and a pH of between 1.5 and 2.4. The sludge substantially dissolves in the mixture and iron phosphate precipitates out. The resultant liquid comprises a substantially zinc ion and phosphate ion solution suitable for use as a make-up feed in zinc phosphating system.

REFERENCES:
patent: 4515643 (1985-05-01), Knaster
patent: 4597806 (1986-07-01), Hauffe
patent: 4968360 (1990-11-01), Hosemann et al.
patent: 4986977 (1991-01-01), Peters

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