中文摘要：

在1 000-1 300℃添加少量Na2CO3＋NaCl复配添加剂,以无烟煤做还原剂等温还原低品位钒钛磁铁精矿,再通过磁选分离获得铁精粉和钒钛渣。考察了C/Fe摩尔比、还原温度和还原时间对铁的还原、钒钛迁移富集行为以及物相转化规律的影响。结果表明,C/Fe摩尔比和反应温度对直接还原过程中有价组分迁移富集的影响很大,当C/Fe摩尔比为1.2时,在1 200℃还原2h,钒钛磁铁矿精矿的金属化率可达到92.8%,还原后钒主要富集在钛渣相中,有效实现了铁与钒/钛的分离。

英文摘要：

Low grade vanadium-bearing titanomagnetite concentrates were reduced isothermally with addition of a small amount of Na2 CO3 ＋NaCl at 1 000-1 300 ℃and anthracite as reductant. Iron concentrates and vanadiumbearing titanium slag were obtained by magnetic separation. The effects of C/Fe molar ratio, reduction temperature, and reduction time on metallization degree of iron, content of V/Ti in samples, and phase transformation were investigated. The results show that C/Fe molar ratio and reduction temperature have great impacts on direct reduction process. Metallization degree is 92.8% under the conditions including C/Fe molar ratio of 1.2, reduction temperature of 1 200 ℃, and reduction time of 2 h. Vanadium is enriched in titanium slag after reduction. Efficient separation between Fe and V/Ti is achieved.