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

C - Chemistry, Metallurgy

09

C

6/210

C09C 1/24 (2006.01) C01G 49/02 (2006.01)

Patent

CA 1110010

A PROCESS FOR THE PRODUCTION OF IRON OXIDE RED PIGMENTS Abstract of the Disclosure 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, separa- ting off the iron oxide pigment obtained from the reaction medium by washing out, and calcining the pigment at a tem- perature in the range of about 600 to 1100°C, the improve- ment which comprises adding an aluminum salt solution over a period of about 5 to 360 minutes at a temperature of about 20 to 100°C to the iron oxide suspension accumulating during reduction of the nitrobenzene, the suspension containing about 150 to 600 g of iron/1 and a residual iron (II) chloride content of about 20 to 160 g/1 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.

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