Method for the preparation of acicular particles containing iron

Details Method for the preparation of acicular particles containing iron Method for the preparation of acicular particles containing iron

1975-09-05

1976-11-30

Padgett, Benjamin R.

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

252 6256, 252 626, 252 6262, 252 6264, 423138, 423151, C04B 3526

Patent

active

039948196

ABSTRACT:
The invention concerns the preparation of acicular particles of mixed oxalates of iron and of one or more metals of the group consisting of cobalt, nickel, copper, manganese, zinc, magnesium and cadmium. The method consists in preparing a first solution containing cations of iron and of the divalent metal or metals, and a second solution containing oxalic acid, one of the said solutions further containing Cl.sup.- and SO.sub.4.sup.2.sup.- anions and at least the second solution containing alcohol with preferably a light hydrocarbon. The first solution is poured very slowly (1 drop every 10 seconds) into the second one, conveniently at temperature below 0.degree. C, while the latter is strongly stirred. The concentration in alcohol is preferably maintained at at least 50% in the second solution during the whole pouring process which should be effected with at least a slight excess of oxalic acid. The particles obtained may be treated for the preparation of solid solutions of oxides of iron and of the divalent metal or metals for the manufacture of magnetic tapes and the like.

REFERENCES:
patent: 3317574 (1967-05-01), Morita et al.
patent: 3873461 (1975-03-01), Mollard et al.
patent: 3897354 (1975-07-01), Woditsch et al.

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