摘要：为节约钛资源,改善氧化钛产品质量,以膜分散器制备硫酸钡颗粒,使用乙二胺四乙酸二钠(EDTA-2Na)进行调控;以制备的硫酸钡作为内核,氨水和钛酸四丁酯(TBOT)作为原料,利用溶剂热进行氧化钛包覆。结果表明:25℃时,以氯化钡和EDTA-2Na溶液为分散相,硫酸钠溶液为连续相,2相流速比为1∶1(10 m L/min)或20∶20(20 m L/min),EDTA-2Na浓度为0. 08、0. 1 mol/L,氯化钡和硫酸钠浓度均为0. 1 mol/L时可以得到粒径较小、分散性好、分布较窄的硫酸钡球状颗粒;温度为120℃,当氨水和TBOT的用量提高到0. 4 m L以上,可以得到核壳型的复合氧化钛。
关键词：球状颗粒；乙二胺四乙酸二钠；二氧化钛；核壳结构；膜分散器
Abstract: In order to save titanium resources and improve the quality of titanium oxide products，the preparation of coreshell BaSO4－TiO2 composite particles was conducted．Firstly，the BaSO4 particles were prepared using a membrane disperser and controlled by disodium edetate( EDTA-2Na) ．BaSO4 obtained by this method was used as a core，and ammonia water and tetrabutyl titanate( TBOT) were used as raw materials，and TiO2 was coated by solvothermal method．The results show that，at 25 ℃，the solution of BaCl2 and EDTA-2Na is used as the dispersed phase，and the Na2SO4 solution is the continuous phase．When the two-phase flow rate is 10∶10 or 20∶20，the concentration of EDTA-2Na is 0．08 mol /L or 0．1 mol /L，and the concentration of BaCl2 and Na2SO4 is 0．1 mol /L，BaSO4 spherical particles are prepared with a small particle size，good dispersibility and narrow distribution．At 120 ℃，when the amount of ammonia water and TBOT is increased to 0．4 mL or more，a core-shell type composite TiO2 could be obtained．
Keywords: spherical particle; disodiumedetate; titanium dioxide; core－shell structure; membrane dispersed
