Experimental Study on Oxidation-reduction of Panzhihua Low Silicon Ilmenite Concentrate
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摘要: 以攀枝花低硅钛精矿为研究对象,研究氧化温度和时间对钛铁矿物相结构和还原的影响,同时对预氧化钛铁矿不同温度和时间下还原失重率和金属化率变化情况进行分析。研究结果表明:钛精矿的氧化在较短时间内可完成,随着氧化温度的升高,钛精矿主要物相变化过程为FeTiO3→Fe2O3+TiO2→Fe2TiO5+Fe2O3+TiO2;在钛铁矿的还原过程中,还原温度和时间对钛铁矿还原的金属化率影响较大,在还原温度大于1 300℃,时间大于8 h后变化不明显;显微结构分析发现,高温还原后金属铁扩散发生聚集,形成球形和棒状金属铁颗粒,其尺寸大约为10μm。Abstract: With Panzhihua low silicon ilmenite concentrate as the object,the effects of oxidation temperature and time on the phase structure and reduction properties of ilmenite were studied,and the weight loss rate as well as the metallization rate in reduction of the pre-oxidized ilmenite at different temperatures and time were analyzed.The results show that the oxidation of ilmenite concentrate can be completed in a short time.With the increase of oxidation temperature,the main phase change process of ilmenite concentrate is FeTiO3→Fe2O3+TiO2→Fe2TiO5+Fe2O3+TiO2.The reduction temperature and time have a great influence on the metallization rate of ilmenite,and the effects are not obvious with the reduction temperature and time more than 1 300 ℃ and 8 h,respectively.The microstructure analysis shows that the aggregation of metallic iron occurs at high reduction temperatures,forming spherical and rod-shaped metallic iron particles with a size of about 10 μm.
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Key words:
- V-Ti magnetite /
- ilmenite concentrate /
- pre-oxidation /
- direct reduction /
- metallization rate /
- microstructure
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