Carbon-decomposing high-whiteness aluminum hydroxide filler and chromaticity control method thereof

The invention relates to carbon-decomposing high-whiteness aluminum hydroxide filler and a chromaticity control method thereof. The control method comprises the following steps of: adding lime milk to a sodium aluminate solution and carrying out deep desilicication on the sodium aluminate solution; refining the sodium aluminate solution by using a leaf filter so as to reduce the content of suspended matters in the sodium aluminate solution; introducing purified CO2 to the sodium aluminate to prepare the aluminum hydroxide; washing the aluminum hydroxide by adopting distilled water; and dryingthe washed aluminum hydroxide. According to the control method disclosed by the invention, the chromaticity of the high-whiteness aluminum hydroxide is stabilized among L value 98-99 percent, value 0-0.2 and b value 0.3-0.6. The carbon-decomposing high-whiteness aluminum hydroxide filler solves the problems of large product aberration and instable chromaticity which are puzzled in production, is beneficial to improvement