采用一个新工艺来处理天然钛铁矿并制备高品位的人造金红石纳米颗粒.该工艺主要包括球磨、碳热还原和盐酸浸出步骤.天然钛铁矿通过球磨处理后,颗粒尺寸会大幅度减小；后续的碳热还原会导致高钛渣的形成.在盐酸浸出工序中,重点考察了酸浸时间、温度和酸的浓度对浸出过程的影响.通过优化工艺条件,最后所得到的产品为纯度超过98.0％、颗粒尺寸为10～200nm的TiO2纳米颗粒.
A new combination method consisting of ball milling,carbothermic reduction and hydrochloric acid leaching was proposed for the preparation of nanosized synthetic rutile from natural ilmenite.The ball milling was employed to grind ilmenite into small particles.The carbothermic reduction was carried out to yield a high titanium slag,which would be easily purified by subsequent leaching procedure.Factors affecting the hydrochloric acid process,namely the leaching time,temperature,and acid concentration,were studied.After leaching and calcining the milled and annealed mixture of FeTiO3/C under the optimal conditions,the TiO2 nanoparticles with size of 10-200 nm and purity＞98.0％ were obtained.
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