氯化法偏钛酸的水解试验研究

Hydrolysis Study of Metatitanic in Chlorination Process

以氯化钛液为原料,考察H^+和Ti^(4+)浓度、反应温度和时间对氯化法偏钛酸水解率及其粒径分布的影响。结果表明,随H^+浓度的增大,偏钛酸的水解率和粒径均先增大后减小;Ti^(4+)浓度对偏钛酸的水解率影响不大,但增大Ti^(4+)浓度有利于偏钛酸晶核的成长;提高反应温度有利于偏钛酸的水解及其晶核的长大;随着水解时间的增加,偏钛酸的水解率逐渐增加,但对偏钛酸粒径的影响甚微。在H^+浓度1.2 g/L、Ti^(4+)浓度20 g/L、水解温度108℃、水解时间2.5 h的最佳条件下可以得到呈片状团聚体、粒径2~10λm的偏钛酸。

The effects of concentration of H^＋ and Ti^4＋ , reaction temperature and time on hydrolysis rate and particle size distribution of metatitanic were studied with titanium chloride solution as raw material. The results show that the hydrolysis rate and particle size of metatitanic rise first then decrease with increase of H^＋ concentration. Concentration of Ti^4＋ has little effect on hydrolysis rate of metatitanic but in favor of the growth of metatitanic nucleus. Increasing reaction temperature is conducive to promote metatitanic hydrolysis reaction and growth of metatitanic nucleus. Hydrolysis rate of metatitanic rises with increase of time. Hydrolysis time has little effect on particle size of metatitanic. Flake aggregated metatitanic with particle size of 2 - 10 μm is prepared under the optimum conditions including H＋ concentration of 1.2 g/L, Ti^4＋ concentration of 20 g/L, hydrolysis temperature of 108 ℃, and hydrolysis duration of 2.5 h.