Effects of Calcination Time on Rutile Pigment Production via Short Sulfate Process
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摘要: 通过硫酸法钛白短流程工艺,以未浓缩工业硫酸钛液为原料制备金红石颜料钛白,研究了高温段保温时间对金红石二氧化钛的晶体结构、粒径分布及颜料性能等影响,采用TG-DSC、XRD、粒度测试和颜料性能检测等对钛白产品进行了表征。随着煅烧时间延长,金红石钛白的晶粒尺寸及金红石含量逐步增大,为正线性相关,而蓝相则逐步减小。最优保温时间为40 min,所得钛白晶粒尺寸170.8 nm,金红石含量98.2%,粒度大小适宜且分布窄,颜料性能最优。Abstract: Short sulfate process was adopted to produce rutile titanium dioxide pigment by using unenriched industrial TiOSO4 solution as raw material. The effects of calcination time at high temperature on the crystal structure,particle size distribution and pigment performances of rutile pigment were investigated. The calcined samples were characterized by TG-DSC,XRD,particle size distribution test and pigment properties test. The rutile crystal grain size and rutile content for the pigment gradually increased as the calcination time was prolonged,with a positive linear correlation. Nevertheless,the blue phase index is negative linear correlation with calcination time. The optimized calcination time at high temperature for the production of rutile pigment is of 40 min at 850 ℃,and the as-prepared rutile pigment is with grain size of 170.8 nm,rutile content of 98.2%,suitable and narrow particle size distribution,and the optimal pigment performances.
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