Study On Calcination Process Of Metatitanic Acid For Production Of Titanium White

This paper provided an overview of the production of titanium white by sulphuric acid-based method. The influences of calcination process of metatitanic acid on the product quality of titanium white were studied.The different processing conditions, such as the sizes of metatitanic acid, water content of filter cake of metatitanic acid, different content of crystal seed, different contents of phosphorus salt, potassium salts and Fe₂O₃ , different rotation speed of reactor, calcining temperatures and feed rate of H2TiO3, were studied in detail. The optimal parameters of calcining process had been determined.At the same time, a good effort had been made to explore the optimized parameters in scale-up practical production. This is benefit of improving the quality of titanium white.On the other hand, in order to determine the influences of many kind of processing parameters on calcination quality, the vertified experiments were performed by selecting typical parameters in terms of the practical experience of industrial production. In order to eliminate the unusual experimental fluctuations and obtain the reliable test data, the average data was been chosen. The obtained optimal processing conditions can be summarized as follows. The D50 of metatitanic acid particles should be controlled between 1.0μm to1.5μm, the water content in filter cake should be controlled between 50%～60%, the content of K₂O, P2O5 and MgO were between 3500ppm～4500ppm, 1500ppm～2500ppm and 200ppm～700ppm, respectively. The amount of crystal seed needed to be controlled between 3%～5%, and Fe₂O₃ content should be at 30ppm below. Simultaneously, the metal ion impurities must be strictly controlled at a minimum level. The filling factor of rotating kiln was initialized between10%～20%. In general, the calcination intensity can be properly controlled by calcination conditions.