Research on Increase of Iron Recovery during Smelting & Reduction of Metallized Pellet of Vanadium-bearing Titaniferous Magnetite
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摘要: 熔分还原金属化球团生产高钒生铁是利用钒钛磁铁矿的途径之一。钒回收率与铁回收率呈密切的正相关关系。为了提高钒回收率，通过正交试验考察了熔分还原温度、炉渣二元碱度、萤石和还原时间对铁回收率的影响，并对还原工艺条件进行了单因素优化试验。结果表明：碱度和时间对铁回收率有较为重要的影响，温度次之，萤石影响最小。铁回收率优化后的工艺条件为温度1 530℃、碱度0.8、萤石2%、还原时间40 min，在此优化条件下，渣铁分离效果好，铁回收率达到95.39%，钒回收率可达92.49%。Abstract: Production of vanadium-rich pig iron by smelting and reduction of metallized pellets is one of the ways to utilize vanadium-bearing titaniferous magnetite.There is a positive correlation between vanadium and iron recovery rates.In order to improve iron recovery,orthogonal experiments were conducted to investigate the effects of melting and reduction temperature,slag basicity,fluorite proportioning and reduction time on the iron recovery rate.After that,single-factor tests were carried out to optimize process condition for reduction.The results show that among those factors most influencing the recovery rate,the basicity and reduction time ranks first;the temperature comes second and fluorite proportioning exerts the least influence.As the temperature is at 1 530℃,basicity at 0.8,fluorite proportioning at 2%,and reduction time for 40 min,the optimal process condition for iron recovery is obtained.Under this condition,iron and vanadium recovery rates can reach 95.39% and 92.49% respectively,and the separation of slag and iron is good.
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