Process for the precipitation of phosphate with iron hydroxide

Details Process for the precipitation of phosphate with iron hydroxide Process for the precipitation of phosphate with iron hydroxide

1992-09-02

1994-03-22

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210722, 210906, 210907, 423305, 423311, 423140, C02F 158, C02F 172

Patent

active

052961516

ABSTRACT:
A process is provided for the precipitation of phosphates from phosphate-comprising waters which utilizes iron hydroxide of the formula Fe.sub.2 O.sub.3.nH.sub.2 O wherein n=0.5-3.0. The iron hydroxide is prepared from natural or technical muds comprising iron in a process which involves dissolving with mineral acid and precipitation with a base. Other metal hydroxides are used together with the iron hydroxide.

REFERENCES:
patent: 3499837 (1970-03-01), Jaunarajs
patent: 4267058 (1981-05-01), Kyri et al.
patent: 5009793 (1991-04-01), Muller
Kawashima et al., Water Research Bd. 20, Nr. 4 471-475 (1986).
Appleton et al., Environmental Science and Technology Bd. 15 Nr. 11 1383-1386 (1981).

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