Method for improvement of properties of synthetic yellow iron ox

Details Method for improvement of properties of synthetic yellow iron ox Method for improvement of properties of synthetic yellow iron ox

1975-02-21

1976-07-13

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423634, C01G 4902

Patent

active

039694941

ABSTRACT:
Synthetic yellow iron oxide (.alpha.-FeOOH) is dispersed in an aqueous 0 - 10N alkali solution and the resultant dispersion is subjected to a hydrothermal treatment at 100.degree.- 250.degree.C. This treatment improves the synthetic yellow iron oxide in that it converts imperfect crystals present in said iron oxide into perfect crystals, changes particles thereof from the shape of needles to that of rods, makes the particle size substantially uniform and heightens the resistivity thereof to heat by about 50.degree.C. The modified synthetic yellow iron oxide thus obtained is innoxious and can be used as a pigment in paints.

REFERENCES:
patent: 3843773 (1974-10-01), Pingaud
patent: 3845198 (1974-10-01), Marcot
patent: 3867516 (1975-02-01), Bodson

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