Method for the preparation of iron hydroxide, iron oxide...

Details Method for the preparation of iron hydroxide, iron oxide... Method for the preparation of iron hydroxide, iron oxide...

2006-12-05

2006-12-05

Vanoy, Timothy C. (Department: 1754)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

C423S140000, C423S142000, C423S150300, C423S632000, C423S633000, C423SDIG010, C423SDIG022

Reexamination Certificate

active

07144561

ABSTRACT:
Described is a method for the manufacture of iron hydroxide, iron oxide hydrate or iron oxide from filter salts from thin acid recovery, in which the filter salts are dissolved in water, the solution is adjusted to a pH of <1, then a pH of 2 to 4 is established by the addition of a strong base, with stirring, the substances precipitating are separated in a known manner, the remanent solution is adjusted to a pH of 6 to 8 by the addition of a strong base, the precipitating iron hydroxide is separated from the solution, washed, dried, and, if desired, dried and/or calcined to form iron oxide.

REFERENCES:
patent: 3619137 (1971-11-01), Ratcliffe
patent: 3816593 (1974-06-01), Johnson et al.
patent: 3927173 (1975-12-01), Melzer
patent: 4119536 (1978-10-01), Iwase et al.
patent: 4889697 (1989-12-01), Fukushima et al.
patent: 5785862 (1998-07-01), Graham et al.
patent: 6139753 (2000-10-01), Taylor

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