Process for the preparation of pigment grade iron oxides from fe

Details Process for the preparation of pigment grade iron oxides from fe Process for the preparation of pigment grade iron oxides from fe

1979-10-02

1981-04-14

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

106304, C01G 4906, C09C 124

Patent

active

042619661

ABSTRACT:
Pigment grade Fe.sub.2 O.sub.3 is prepared from ferrous sulphate by a roasting process. The ferrous sulphate, partly dehydrated and granulated, is partially converted to the oxide by roasting. After elimination of soluble constituents by washing with water, the oxide is subjected to pigmentary calcination and then crushed and optionally micronized. This process makes it possible to prepare red pigments of excellent quality characterized particularly by pure tints ranging from orange-red to purplish-red. The oil absorptions are especially low. Low toxic impurity concentrations permit the use of these pigments in foodstuffs.

REFERENCES:
patent: 2184738 (1929-12-01), Fireman
patent: 2416138 (1947-02-01), Ayers
patent: 3554733 (1971-01-01), Columbo et al.
patent: 3619137 (1971-11-01), Ratcliffe
patent: 3755554 (1973-08-01), Lailach et al.
patent: 3812242 (1974-05-01), Barilli et al.
patent: 4129454 (1978-12-01), Pavonet
patent: 4139398 (1979-02-01), Pellizzon et al.

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