直接还原处理低品位钒钛磁铁精矿

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.%Low grade vanadium-bearing titanomagnetite concentrates were reduced isothermally with addition of a small amount of Na2CO3+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.