| abstract |
The pH at the time of neutralization of the cobalt (divalent) salt aqueous solution and alkaline solution is 10-13, and after mixed neutralization start or after completion | finish of mixed neutralization, the mixed liquid keeps the temperature of 10 degreeC-40 degreeC, and contains oxygen-containing gas in the said mixed liquid Continuously bubbling to produce a cobalt hydroxide precursor, and the resulting precursor is filtered, washed, dried and pulverized, and then the precursor is baked at 500 ° C. to 850 ° C. in a sealed atmosphere for 0.5 to 3 hours. A method for producing a granular cobalt oxide black pigment is disclosed. |