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通过单因素实验考察了还原温度、还原时间及碳氧摩尔比(nC/nO)对钒钛磁铁矿含碳球团还原的影响,结合扫描电镜照片解释了钒钛磁铁矿的还原机理.实验结果表明,适当升高还原温度、延长还原时间及增加碳氧摩尔比均可以促进钒钛磁铁矿的还原,并且金属化率随还原温度的升高先急剧升高而后趋于平缓,随着还原时间的延长及碳氧摩尔比的增加而先升高后降低,而残碳量随着反应的进行不断降低.当还原温度为1350℃,还原时间为30 min,碳氧摩尔比为1.2时,球团的金属化率达到最大值.通过扫描电镜照片可以看出,球团在还原过程中形成了铁连晶,并且在不同的还原条件下铁连晶的大小及形态不同.
The effects of reduction temperature, reduction time and molar ratio of carbon to oxygen (nC / nO) on the reduction of carbon-containing pellets of vanadium-titanium magnetite were investigated by single-factor experiments. The reduction mechanism of vanadium-titanium magnetite was explained by scanning electron micrographs. The experimental results show that proper reduction temperature, prolonging the reduction time and increasing the molar ratio of carbon to oxygen can promote the reduction of vanadium-titanium magnetite, and the metallization rate increases sharply with the reduction temperature and then tends to be gentle with With the reduction time prolonged and the molar ratio of carbon and oxygen increased firstly and then decreased, while the residual carbon decreased with the reduction of the reaction.When the reduction temperature was 1350 ℃, the reduction time was 30 min, the molar ratio of carbon to oxygen was 1.2 , The metallization rate of the pellets reaches the maximum value.From the SEM images, it can be seen that the pellets formed ferrocene during the reduction process, and the size and morphology of the ferro-crystals were different under different reduction conditions.