含钛高炉渣制备二氧化钛晶须的研究

以承德钢铁公司含钛高炉渣以及石英、硼酸、硼砂为主要原料，将配料组成选择在Na₂O-CaO-Al₂O₃-B₂O₃-SiO₂-TiO₂系的分相区域，其中炉渣质量分数为50%~72%。将混合均匀的配料在1 250 ℃高温厢式电阻炉中熔融制得玻璃样品，对玻璃样品在700~900 ℃进行热处理制备二氧化钛晶须。用X射线衍射（XRD）、扫描电镜（SEM）对样品进行物相和形貌分析，结果表明：热处理温度为850 ℃时析出直径为0.5~1 μm、长径比大于50的钛酸钙（CaTiO₃）晶须。样品组成中氧化钠的含量对钛酸钙晶须的生成影响较大，氧化钠的引入导致［BO₃］向［BO₄］转变，促进系统分相，使分相界面增多，提供了有利的成核位，促进了晶须的生长。样品的光催化效率最高可达58%。

Study of TiO2 whiskers prepared with tataniferous blast-furnance slag

Using titanium-bearing blast furnace slag（mass fraction，50%~72%） of Chengde Iron and Steel Company，quartz， boric acid，and borax as the main raw materials，composition selecting in the phase-separation region of the Na₂O-CaO-Al₂O₃-B₂O₃-SiO₂-TiO₂ system，the glass sample was prepared through mixed batch and melted at 1 250 ℃ in a van-type electric furnace.TiO₂ whiskers were achieved by heat-treatment to the glass sample at 700~900 ℃.The phase and morphology of the sample were analyzed by XRD and SEM.Results indicated that the diameter of CaTiO₃ whiskers was 0.5~1 μm， and the aspect ratio was more than 50，when the heat-treatment was at 850 ℃. The Na₂O content in the composition of the sample had great influence on the generation of CaTiO₃ whiskers.Through adding Na₂O to the glass composition，the［BO₃］ of glass system transformed to［BO₄］ and the glass phase separation interfaces increased，then favorable nucleation sites promoted the growth of the whiskers.The photocatalytic efficiency of the sample could reach 58%.