金红石型钛白粉生产过程中煅烧晶种的制备与应用

Preparation and Application of Calcining Seed in the Production Process of Rutile Titanium Pigment

以偏钛酸为原料,经碱解反应、水解反应、一次洗涤、中和反应、二次洗涤、酸溶反应,低温下制备了高活性金红石型TiO2煅烧晶种,并将其用于盐处理过程,考察了晶种添加量和煅烧温度对TiO2晶型转化的影响.结果表明,在酸溶温度100℃、浆液浓度(以TiO2计)90～120g/L、酸/钛质量比0.3～0.5、酸溶时间90～120min的条件下,反应产物为金红石型TiO2含量90%以上的晶种溶胶,且稳定性良好.在盐处理阶段,当晶种加入量3%～5%(ω)、煅烧温度900℃、煅烧时间2h时,TiO2的金红石晶型转化率达99%以上.

Calcining seed of rutile titanium dioxide was prepared at low temperature using metatitanic acid as raw material through alkaline hydrolysis,hydrolysis reaction,first washing,neutralization reaction,second washing and acid dissolution.These kinds of seed were added in the salt treatment,and the influences of calcining seed and calcination temperatures on the content of rutile TiO2 pigment were examined systemically.The results indicated that above 90% rutile titania gel with high stability could be obtained under the conditions as follows：reaction temperature of 100 ℃,slurry concentration（based on TiO2 concentration） in 90～120 g/L,mass ratio of HCl to TiO2 in 0.3～0.5,reaction time for 90～120 min.During the salt treatment,the rutile TiO2 content could be more than 99% when the content of seed was 3%～5% at the calcination temperature of 900℃ for 2 h.