Tian Congxue
State Key Testing Laboratory of Vanadium & Titanium; Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province, Panzhihua University, Panzhihua, 617000, Sichuan, People's Republic of China.
Sci Rep. 2024 Aug 12;14(1):18703. doi: 10.1038/s41598-024-69770-0.
Controlling and predicting the narrow particle size distribution of metatitanic acid could help to improve pigment and application performances of TiO. To prepare metatitanic acid with narrow particle size distribution, the hydrolysis conditions of industrial TiOSO solution were optimized by using the response surface methodology of Box-Behnken design method. The effects of hydrolysis conditions such as TiO concentration, aging time and hydrolysis time on the diameter distance ratio and structure of metatitanic acid were investigated. The prediction model including the hydrolysis variables with good fitting result was established to predict the diameter distance ratio or optimize the hydrolysis variable values. The regression equation model was significant and reliable with actual correlation coefficient R of 0.9989. The hydrolysis conditions greatly influenced the quality and quantity of hydrolysis induced crystal nucleus, hydrolysis rate, completeness degree of hydrolysis, crystallization growth and aggregation rate, and eventually affected the particle size distribution of metatitanic acid. The synergistic interaction for TiO concentration and hydrolysis time was very significant. The verification experiments confirmed that the diameter distance ratio could reach the average value of 1.100 under the optimal conditions. The prepared metatitanic acid had anatase TiO phase structure, with average particle size of 1.621-1.819 µm. And this helped to improve the high quality and green development of the titanium dioxide industry.
控制和预测偏钛酸窄粒度分布有助于提高TiO₂的颜料性能和应用性能。为制备具有窄粒度分布的偏钛酸，采用Box-Behnken设计法的响应面法优化工业TiOSO₄溶液的水解条件。研究了TiO₂浓度、陈化时间和水解时间等水解条件对偏钛酸直径距离比和结构的影响。建立了包含水解变量且拟合效果良好的预测模型，以预测直径距离比或优化水解变量值。回归方程模型显著可靠，实际相关系数R为0.9989。水解条件极大地影响水解诱导晶核的质量和数量、水解速率、水解完全程度、结晶生长和聚集速率，最终影响偏钛酸的粒度分布。TiO₂浓度和水解时间的协同作用非常显著。验证实验证实，在最佳条件下直径距离比可达到1.100的平均值。制备的偏钛酸具有锐钛矿TiO₂相结构，平均粒径为1.621 - 1.819 µm。这有助于推动二氧化钛行业的高质量和绿色发展。
