以钛铁矿为原料,通过硫酸法固相酸解制取二氧化钛(TiO2)具有较高的酸解率。在钛液水解过程中,添加适量乙二胺四乙酸可促进钛铁分离。超声波的机械作用和空化效应有助于进一步除去微量的杂质离子。采用X射线荧光能谱分析、BET比表面积与孔隙度分析、及扫描电子显微镜分析研究了EDTA及超声波对TiO2颗粒的优化作用,并制备以不同TiO2为载体的SCR催化剂进行脱硝活性测试。结果表明:EDTA在钛液水解阶段可以起到很好的除铁效果,从而缩短工艺流程,提高TiO2纯度。超声波在提高除杂效果的同时可降低TiO2的粒度,优化其分散性能,进而使SCR催化剂具备更优的脱硝催化活性。 Taking ilmenite as raw material, titania (TiO2) obtained by sulfuric acid solid-phase acid hydrolysis has higher acid hydrolysis rate. In the hydrolysis of titanium solution, add appropriate amount of ethylenediaminetetraacetic acid can promote the separation of titanium. The mechanical and cavitation effects of the ultrasonic wave help to further remove traces of impurity ions. The effects of EDTA and ultrasonic on TiO2 particles were studied by X-ray fluorescence spectroscopy, BET surface area and porosity analysis and scanning electron microscopy. The SCR catalysts with different TiO2 as carrier were also prepared for denitrification activity test. The results show that EDTA can play a very good iron removing effect in the hydrolysis of titanium liquid, which can shorten the process flow and improve the purity of TiO2. Ultrasound can improve the removal efficiency of TiO2 while reducing the particle size of TiO2 to optimize its dispersion performance, so as to make the SCR catalyst have better denitration catalytic activity.