Study on Carbothermal Sodium Reduction Process of Vanadium-titanium Magnetite Concentrate
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摘要: 为了实现钒钛磁铁精矿的低温综合利用, 采取碳热钠化工艺降低还原和熔分温度, 考察了铁、钒、钛的富集回收情况。结果表明, 钠化剂显著改善了钒钛磁铁精矿的还原及熔分效果, 当钠化比为1.2时, 1 100℃还原60 min即可达到90%以上的金属化率, 1 250℃以上的温度下熔分后, 铁的收得率达到96%, 钒在铁水中的富集率为75%。熔分渣在无酸环境下经湿法处理后TiO2含量达到77%, 经还原熔分去除铁后品位可进一步提升。Abstract: In order to realize the comprehensive utilization of vanadium-titanium magnetite concentrate at lower temperature,carbothermal sodium-treatment was adopted to reduce the reduction and smelting-separation temperatures,and the enrichment recycling of iron,vanadium as well as titanium was investigated.The sodium agent improves the reducibility and smelting-separation performance of the vanadium titanium magnetite concentrate significantly.The metallization ratio of the sample reduced at 1 100 ℃ for 60 min with a sodium ratio of 1.2 was higher than 90%,and the iron yield reached 96% with smelting-separation at 1 250℃ or higher and the enrichment ratio of vanadium in iron was 75%. Moreover,TiO2 content in the slag reached 77% when the smelting-separated slag was treated by wet-process in acid free environment,which could be further enhanced when the iron is removed via the reduction and smelting-separation process.
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