PROCESS FOR THE MANUFACTURING OF GOETHITE PIGMENTS

摘要

A process for manufacturing goethite containing the steps: a) Dissolution of ferric (III) nitrate in water b) Treatment of the solution obtained according to step a) at a temperature in the range of 55° to 65° C, c) Isolating the goethite from the suspension obtained according to step b) d) Suspending the isolated goethite of step c) in water e) Treating the suspension of step d) hydrothermally at a temperature of 120 to 220 °C, preferably of 150 to 200 °C under autogenous pressure.