Regression Relations of Hydrolysis Parameters for Rutile Titanium White Preparation via Short Sulfate Process
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摘要: 以未浓缩低浓度工业钛液为水解原料, 通过自生晶种稀释热水解的硫酸法钛白短流程工艺制备金红石型颜料钛白, 研究了水解条件 (底水量、熟化时间和水解时间) 对偏钛酸和金红石产物的结构、粒径分布和颜料性能等的影响规律及数学回归关系。水解条件对水解初始形成晶种的数量和质量、晶粒的生长和聚集等起重要影响, 并最终决定产品的颜料性能;水解条件与产物的晶体结构、颗粒多分散度和颜料性能间存在数学相关关系。最优水解条件为:底水量比例为0.123, 熟化时间为29.05 min, 二沸后的水解时间为2.6 h左右。Abstract: The rutile TiO2 white pigment was prepared via short sulfate process of diluted thermal hydrolysis with self-generating crystal seeds using unenriched low concentration of industrial titanyl sulfate solution as titanium source. The regression relations and influences of the hydrolysis parameters,including preadding water volume ratio,aging and hydrolysis time on the structure,particle size distribution and pigment properties of metatitanic acid and rutile TiO2 white pigment were investigated. The hydrolysis parameters significantly influence the number and quality of the initial formed nuclei,the crystal growth and aggregation,and eventually determine the pigment properties of the products. There exist mathematical correlations between the hydrolysis parameters and products crystal structure,particle polydispersity index,and pigment properties. The optimal hydrolysis parameters are 0.123 of the pre-adding water volume ratio,29.05 min of the aging time and about 2.6 h of hydrolysis time after the second boiling.
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