PROCESS FOR PREPARING COBALT PIGMENT Russian patent published in 1997 - IPC

FIELD: chemical industry. SUBSTANCE: zeolite NaA is treated with cobalt-containing solution resulting from deposition of cobalt hydroxide during hydrochemical treatment of cobalt-nickel concentrate to neutral reaction of liquid phase. The product is filtered, washed, dried and calcined at 1000-1100 C for 3 or 4 hours. Pigment comprises 4.0-4.5 wt% $$$, has crystalline nephelinic structure with main lines on X-ray diffraction pattern and color characteristics of standard cobalt aluminate ("cobalt blue"). EFFECT: more efficient preparation process.