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以铝热法生产的高钛铁为原料,以Al为还原剂进行真空还原精炼制备低氧高钛铁。研究了精炼温度、精炼时间等因素对精炼效果的影响,采用XRD、SEM及化学元素分析等手段对高钛铁合金进行了表征。结果表明:精炼后的高钛铁主要含有TiFe2、Fe2TiO5、TiO、Al2O3、TiAl、Fe0.942O等相,精炼后合金的微观结构均匀致密,夹杂物得到有效去除,氧含量大幅降低。但精炼温度过高,精炼时间过长,会恶化精炼效果。精炼后合金中钛含量(质量分数)为(69.00～71.00)%,铝含量低于2.50%,硅含量低于2.63%,氧含量低于3.52%,完全符合优质高钛铁的技术指标。
The production of high-titanium ferrotitanium as raw material, Al as reductant for vacuum reduction refining low-oxygen ferrotitanium. The effects of refining temperature, refining time and other factors on the refining effect were studied. The high-titanium ferroalloy was characterized by XRD, SEM and chemical elemental analysis. The results show that the refined high titanic iron mainly contains TiFe2, Fe2TiO5, TiO, Al2O3, TiAl, Fe0.942O and other phases. The microstructure of the refined alloy is uniform and compact, the inclusions are effectively removed and the oxygen content is greatly reduced. But the refining temperature is too high, the refining time is too long, will deteriorate the refining effect. After refining, the content of titanium (mass fraction) is between (69.00-71.00)%, the content of aluminum is less than 2.50%, the content of silicon is less than 2.63% and the content of oxygen is less than 3.52%.