| 摘要 |
A high-purity zirconium oxide white pigment is prepared by (1) precipitating zirconium oxychloride from a solution thereof in hydrochloric acid, (2) separating and washing the precipitated zirconium oxychloride, (3) heating the washed zirconium oxychloride in an atmosphere of carbon tetrachloride to a temperature sufficient to remove occluded liquids, (4) continuing to heat the zirconium oxychloride to a temperature at which it vaporizes, (5) contacting the vapors with a cool surface, thereby causing the vapors to condense, (6) recovering the sublimate from the cool surface, and (7) slowly heating the sublimate to an elevated temperature in an oxygen-containing atmosphere, thereby providing a fine powder of monoclinic zirconium oxide. The zirconium oxide product is useful as a pigment, particularly in solar reflector coating formulations.
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