钛铁矿制备纳米钛基材料的研究

以廉价易得的天然钛铁矿为原料,采用机械球磨活化+碱浸工艺制备FeTiO3纳米花,采用机械球磨活化+碱浸+酸浸工艺制得T iO2/FeT iO3纳米微粒.首先通过机械球磨活化减小钛铁矿的物理尺寸,使其化学性质变得活泼,然后通过碱浸的方法得到呈三维花瓣状的FeT iO3纳米花,最后纳米花进一步酸浸得到规则的TiO2...

Investigation on the nanometer titanium-based materials from ilmenite

In this work, natural ilmenite, which is low-cost and accessible to get, was being intensively utilized for raw material to prepare FeTiO₃ nanometer flower through the method of the activation of mechanical ball mill + alkali leaching, and TiO₂ / FeTiO₃ nanometer particles were obtained through the process of the activation of mechanical ball mill + alkali leaching + acid leaching. First of all, the size of ilmenite is reduced by mechanical activation and its chemical properties become active. Then, FeTiO₃ nanoscale flower with a thickness of around 25 nm and a length between 200 and 400 nm was achieved by alkali immersion (1 mol/L NaOH). Subsequently, the nanometer flower was further immersed in acid (2 mol/L HCl) to obtain regular TiO₂/ FeTiO₃ nanometer particles with a diameter of about 30 nm. In addition, the mechanisms of acid leaching and alkali leaching were analyzed, indicating the unstable liquid phase intermediates are formed in the two reactions, which can be explained by the mechanism of dissolution and precipitation generated by the hydrolysis of intermediates. Furthermore, the formation and hydrolysis of intermediates are related to the concentration of acid or alkali.