PROCESS FOR PRODUCTION OF GRANULAR COBALT OXIDE BLACK PIGMENT, AND GRANULAR COBALT OXIDE BLACK PIGMENT

摘要

doing Cobalt ( 2 ) neutralization of the pH of the aqueous alkaline solution and 10 to 13, after neutralization mixture starts, or after the neutralization mixture was completed, the mixture while maintaining the temperature 10 ~ 40 by bubbling an oxygen-containing gas in the mixed solution was continuously generating a cobalt hydroxide precursor , the precursor and the resulting filtered , washed , dried , pulverized , and then the precursor in a closed atmosphere of 500 ~ 850 0.5 ~ 3 discloses a method for producing a particulate cobalt oxide black pigment, characterized in that the firing .