Process for preparing magnetite starting from ferrous sulphate s

Details Process for preparing magnetite starting from ferrous sulphate s Process for preparing magnetite starting from ferrous sulphate s

1975-02-24

1977-10-18

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423151, 423152, 423632, 423DIG2, C01G 4902

Patent

active

040546390

ABSTRACT:
A process is disclosed for preparing magnetite having an equiaxial morphology and a narrow particle size dispersion by precipitation from a ferrous sulphate solution, characterized in that:
A. during a first step, at a temperature between 15.degree. and 40.degree. C, alkali is added to the ferrous sulphate solution, in a stoichiometric amount adapted to precipitate, in the form of ferrous hydroxide, 2/3 of the Fe.sup.+.sup.+ ion, and then, at the conclusion of said precipitation, air is blown thereinto thus oxidizing ferrous hydroxide to goethite .alpha.FeO(OH); and
B. during a second step, alkali is added to the slurry obtained in the first step, the remaining Fe.sup.+.sup.+ is precipitated in the form of ferrous hydroxide, and the slurry is heated to a temperature between 70.degree. and 100.degree. C, thus causing the formation of magnetite which is then separated from the solution.

REFERENCES:
patent: 802928 (1905-10-01), Fireman
patent: 1392927 (1921-10-01), Fireman
patent: 2631085 (1953-03-01), Bennetch
patent: 3617562 (1971-11-01), Cywin et al.
patent: 3755554 (1973-08-01), Lailch et al.
patent: 3845198 (1974-10-01), Marcot
patent: 3931007 (1976-01-01), Sugano et al.

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