真空还原精炼法制备低氧高钛铁合金

Preparation of High Titanium Ferroalloy with Low Oxygen Through Vacuum Reduction Refining

针对铝热还原法制备的高钛铁中氧含量高、夹杂多等缺点,提出了以铝热法高钛铁为原料进行真空还原精炼制备低氧高钛铁的新思路.研究了精炼温度、精炼渣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:还原精炼后合金的微观结构均匀致密,夹杂物得到有效去除,氧含量急剧降低;2 000℃时以CaO-Al2O3为精炼渣制备的高钛铁合金中各元素的质量分数分别为钛74.5%,铁18.2%,铝2.17%,硅0.81%,氧3.20%,完全符合优质高钛铁的技术指标.

To reduce oxygen content and inclusions in the high titanium ferroalloy prepared by the aluminum thermal reduction,the vacuum reduction refining method was used to prepare the low oxygen high titanium ferroalloy in which the high titanium ferroalloy prepared by aluminum thermal method was used as raw materials.Effects of the refining temperature and refining slags were studied.The high titanium ferroalloy was characterized by XRD,SEM and chemical elemental analysis.The results showed that the microstructure of the reduction refining alloy is uniform and compact,the inclusions in the alloy are effectively removed and the oxygen content decreases dramatically.The mass percent composition of Ti,Fe,Al,Si,O in the refined alloy prepared with CaO-Al2O3 as vefining slag at 2 000 ℃ is 74.5%,18.2%,2.17%,0.81%,3.20%,respectively,which is fully consistent with the technical indicators of the high quality high titanium ferroalloy.