| 主权项 |
1. Process for the production of finely divided haematite having a particle size of less than or equal to 100 nm and a specific BET surface area of from 40 m2/g to 150 m2/g, (measured in accordance with DIN 66131), which comprises at least the steps
a) provision of a mixture of metallic iron and water having a temperature of from 60 to 120° C., b) addition of dilute nitric acid to the mixture from step a), c) separation of the aqueous suspension of finely divided haematite from any unreacted, metallic iron, d) optionally isolation of the finely divided haematite from the aqueous suspension which has been separated off. |
