Process for the production of iron oxide red pigments

Details Process for the production of iron oxide red pigments Process for the production of iron oxide red pigments

1979-05-22

1980-11-18

McCarthy, Helen M.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

423633, 423634, C09C 124

Patent

active

042343488

ABSTRACT:
In the production of an iron oxide red pigment by reducing nitrobenzene with metallic iron in the presence of an acidic iron (II) salt solution, separating off the iron oxide pigment obtained from the reaction medium by washing out, and calcining the pigment at a temperature in the range of about 600.degree. to 1100.degree. C., the improvement which comprises adding an aluminum salt solution over a period of about 5 to 360 minutes at a temperature of about 20.degree. to 100.degree. C. to the iron oxide suspension accumulating during reduction of the nitrobenzene, the suspension containing about 150 to 600 g of iron/l and a residual iron (II) chloride content of about 20 to 160 g/l expressed as iron, the initial pH-value of the iron oxide suspension of about 3 to 5 being adjusted over a period of about 5 to 180 minutes to a final pH-value of about 5.5 to 6.5.

REFERENCES:
patent: 3565656 (1971-02-01), Allen et al.
patent: 4145228 (1979-03-01), Croce et al.

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