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PROCESS FOR PRODUCTION OF GRANULAR COBALT OXIDE BLACK PIGMENT, AND GRANULAR COBALT OXIDE BLACK PIGMENT
PROCESS FOR PRODUCTION OF GRANULAR COBALT OXIDE BLACK PIGMENT, AND GRANULAR COBALT OXIDE BLACK PIGMENT
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机译:颗粒状氧化钴黑颜料和颗粒状氧化钴黑颜料的生产方法
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摘要
Disclosed is a process for production of a granular cobalt oxide black pigment. The process involves the step of performing the mixing neutralization of an aqueous solution of a salt of cobalt (bivalent) with an alkaline solution at a pH ranging from 10 to 13. After the mixing neutralization is initiated or completed, an oxygen-containing gas is bubbled in the mixed solution continuously while keeping the temperature of the mixed solution at 10 to 40‹C to produce a cobalt hydroxide precursor. The precursor is filtered, washed, dried, triturated, and then burned in a closed air at 500 to 850‹C for 0.5 to 3 hours, thereby producing the granular cobalt oxide black pigment. ® KIPO & WIPO 2009
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