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钒钛磁铁矿中铁钒钛都应得到提取利用。TiO_2进入冶炼过程使铁精矿中钛的提取极为困难,且引起一系列新的问题。因此,应积极开展冶炼前铁钒钛分离的试验研究。 用热力学数据论证了铁、钒、钛氧化物选择还原的内在规律及适宜的条件。 进行r铁精矿球团的钠化——氧化焙烧、浸钒(或不浸钒)、用气体还原剂(CO及H_2+CO)还原、磁选分离、非磁性产物提钒等试验研究。得到如下结果:磁性产物含T_(Fe)89％(收率98～99％),TiO_25％(收率25％),S含量<0.03％;非磁性产物含T_(Fe) 3.5％,TiO_2 55～57％(收率75％),V_2O_F2.5～2.8％(不浸钒的情况下)。对先提钒流程进行了提钒条件试验,钒回收率可达80％以上;富集了V_2O_5的非磁性产物再次氧化焙烧,可使钒浸出率达90％。非磁性产物是一种新型的(钒)钛精矿。实验发现球团升温还原过程的粘结现象。分离结果证实了关于还原选择性的热力学分析的结论,两种产品中V_2O_5与TiO_2都有极端密切的线性相关关系(相关系数r=0.950～O.952)。 还原过程温度高达1200℃,对目前工业还原竖炉仍嫌过高。降低还原温度及解决球团粘结问题是下一步必须进行的工作。
Vanadium titanium magnetite vanadium iron and titanium should be extracted and utilized. Titanium dioxide into the smelting process makes the extraction of titanium in iron concentrates extremely difficult, and caused a series of new problems. Therefore, should be actively carried out before smelting iron vanadium and titanium separation experimental study. The thermodynamic data were used to demonstrate the inherent rules and suitable conditions for selective reduction of iron, vanadium and titanium oxides. The iron-oxide roasting of iron concentrate pellets was carried out. The vanadium (or vanadium-free), reduction with gaseous reducing agent (CO and H 2 + CO), magnetic separation and non-magnetic product vanadium were studied. The results are as follows: the magnetic products contain 89% T_ (Fe), 98% ~ 99% TiO_2, 25% TiO_2, and S content is less than 0.03% ~ 57% (yield 75%), V 2 O_F 2.5 ~ 2.8% (vanadium-free case). Vanadium pretreatment vanadium extraction process conditions, vanadium recovery rate of up to 80%; V_2O_5 enrichment of non-magnetic products roasting again, the vanadium leaching rate of 90%. Non-magnetic product is a new (vanadium) titanium concentrate. Experiment found that the pellet temperature reduction process of bonding phenomenon. The results of the separation confirmed the conclusion that there was an extremely close linear correlation between V 2 O 5 and TiO 2 in both products (correlation coefficient r = 0.950-0.952) for the conclusion of thermodynamic analysis of reduction selectivity. Reduction process temperature up to 1200 ℃, the current industrial shaft furnace is still too high. Reduce the reduction temperature and solve the problem of pellet bonding is the next step must be carried out.