钒钛磁铁精矿直接还原反应行为及其强化还原研究

Direct reduction and enhanced reduction of vanadium-bearing titanomagnetite concentrates

通过在钒钛磁铁精矿中添加还原煤粉和少量添加剂,研究了还原温度、还原时间和添加剂等因素对钒钛磁铁精矿金属化率的影响,并对添加剂强化还原机理进行了探讨.结果表明:还原温度、还原时间、碳铁摩尔比及添加剂对金属化率的影响较大.在还原温度1200℃、还原时间120 min的条件下,未添加添加剂时金属化率最高可达84.5%;添加质量分数3.0%Na2CO3或CaF2的条件下,钒钛磁铁精矿的金属化率可以分别达到96.5%和93.3%.

Vanadium-bearing titanomagnetite concentrates were reduced isothermally by adding pulverized coal and additives.Some factors which influence the metallization degree,such as reaction temperature,reaction time,C-to-Fe molar ratio and additives,were investigated.The enhanced reduction mechanism of additives was also discussed.The results show that reaction temperature,reaction time,C-to-Fe molar ratio and additives have great effect on the metallization degree.Under the condition of the reaction temperature of 1 200 ℃ and the reaction time of 120 min,the maximum metallization degree is 84.5% without any additive.Using Na2CO3 or CaF2 as an additive,the reduction of vanadium-bearing titanomagnetite concentrates can be promoted.With the addition of 3.0% Na2CO3 or CaF2,the metallization degree of vanadium-bearing titanomagnetite concentrates can reach up to 96.5% and 93.3% after the samples are heated at 1 200 ℃ for 120 min,respectively.