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研究了钒钛磁铁精矿在等温预氧化条件下的物相组成及其转变情况,并将钒钛磁铁精矿原矿和预氧化后的样品以煤粉为还原剂进行直接还原,利用XRD和ICP-AES对产物进行物相和成份分析.研究结果表明:预氧化能够加速还原过程,提高金属化率,较为适宜的预氧化条件为:预氧化温度为900℃,预氧化时间为30 min;预氧化矿在1 200℃下还原60 min,比钒钛磁铁精矿原矿金属化率提高了14.0%.其强化还原的机理是:在预氧化过程中Fe3O4被氧化成Fe2O3,FeTiO3被氧化成Fe2O3.FeTiO3固溶体、Fe2O3和TiO2,破坏了钒钛磁铁精矿的结构,矿粉内部形成了大量孔隙,改善了还原反应的动力学条件,加速了还原过程.
The phase composition and the transformation of vanadium-titanium magnetite concentrate under isothermal preoxidation conditions were studied. The vanadium-titanium magnetite concentrate ore and the pre-oxidized sample were directly reduced with pulverized coal as the reducing agent. XRD and ICP -AES.The results showed that: pre-oxidation can accelerate the reduction process and improve the metallization rate, the more suitable pre-oxidation conditions: pre-oxidation temperature of 900 ℃, pre-oxidation time of 30 min; pre-oxidation The reduction of the oxide ore at 1 200 ℃ for 60 min resulted in a 14.0% increase in the metallization ratio of the raw ore from the vanadium-titanium magnetite concentrate, and the mechanism of its enhanced reduction was as follows: Fe3O4 was oxidized to Fe2O3 during the pre-oxidation and FeTiO3 was oxidized to Fe2O3. FeTiO3 solid solution, Fe2O3 and TiO2, destroyed the structure of vanadium-titanium magnetite concentrate, formed a large number of pores in the slag, improved the kinetic conditions of the reduction reaction and accelerated the reduction process.