METHOD OF PRODUCING TITANIUM HYDROXIDE

• Main Authors: MOCHIDA SHUHEI, WATANABE NOBUO, KENJO MASARU, YAMAMOTO TAKASHI, MATSUI KOTONAGA
• Format: Patent
• Language: English; Japanese
• Published: 06.06.2019
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY

To provide a method of producing fine and highly pure titanium hydroxide capable of maintaining a high specific surface area of 90 m/g or more even when heated at 600°C during production of barium titanate.SOLUTION: The method of producing titanium hydroxide includes: a step A of obtaining titanium hydroxide having a BET specific surface area of 300 m/g or more and a crystallite diameter of 20 Å or more by simultaneous neutralization of titanium halide aqueous solution and an alkaline substance under conditions of pH 4.8 to 5.2 and temperature 40 to 55°C; and a step C of washing the titanium hydroxide and dispersing it in water so as to form a slurry, adding to the slurry, in terms of titanium oxide(TiO), (a)1.0 to 5.0% by weight of phosphorus compound or 2.0 to 5.0% by weight of silicon compound or (b) a total of 1.0 to 5.0% or less by weight of a phosphorus compound and a silicon compound, and washing and drying a mixed slurry obtained.SELECTED DRAWING: Figure 4 【課題】チタン酸バリウムの製造時、６００℃加熱でも、９０ｍ2／ｇ以上の高比表面積を維持できる微細かつ高純度な水酸化チタン製造方法の提供。【解決手段】ハロゲン化チタン水溶液とアルカリ性物質をｐＨ４．８〜５．２及び温度４０〜５５℃の条件下に同時中和して、ＢＥＴ比表面積３００ｍ2／ｇ以上、結晶子径２０Å以上の水酸化チタンを得る工程Ａと、該水酸化チタンを水洗し、水分散させて、スラリーとし、このスラリーに酸化チタン（ＴｉＯ2）換算、（ａ）リン化合物１．０〜５．０重量％若しくはケイ素化合物２．０〜５．０重量％、又は（ｂ）リン化合物とケイ素化合物を合計量で１．０〜５．０重量％以下％を加え、得られた混合スラリーを水洗し、乾燥する工程Ｃを含む水酸化チタンの製造方法。【選択図】図４