METHOD FOR PRODUCTION OF BLUE ALUMINIUM-COBALT PIGMENT Russian patent published in 1997 - IPC

FIELD: production of blue aluminium-cobalt pigment which may be used in paint and varnish industry, in artistic and restoration works; production of paint for ceramics. SUBSTANCE: method involves mixing of compounds of cobalt and aluminium, mechanical activation of mixture in centrifugal mill and calcination. Co₃O₄ and aluminium hydroxide having pseudobemite structure or powder of metal aluminium are used as origin components. Activation is carried out at power strength 10-50 Wt/g, it is followed by grinding of caked agglomerates prepared by calcination, the process takes place till average size of particles is 0.5-1.0 mcm. Pigment comprises, mas.%: CoO, 22-25; Al₂O₃, the balance. EFFECT: improved properties. 4 cl, 1 tbl