论文部分内容阅读
为探明钒钛磁铁矿直接还原过程及其影响因素,研究了不同还原温度、不同还原时间、不同配碳比对钒钛磁铁矿含碳团块直接还原过程的影响,并通过XRD分析方法对还原机理进行了分析。研究结果表明,在一定条件下,直接还原团块金属化率随温度升高而升高,但还原温度超过1 200℃后,金属化率增幅逐渐减少,这是由于还原温度高于1 200℃后,金属化团块内铁氧化物的还原逐渐趋于平缓,而铁钛化合物的还原较为缓慢;团块金属化率随反应时间的延长和配碳比的升高均呈现了先升高后降低的趋势,这主要是由于反应时间过长使得金属化团块发生了再氧化及煤粉配入量过大导致带入灰分较多,在一定程度上阻碍了还原反应的顺利进行,从而导致金属化率降低。
In order to investigate the direct reduction process of vanadium-titanium magnetite and its influencing factors, the effects of different reduction temperature, different reduction time and different carbon ratios on the direct reduction process of carbon-bearing agglomerates were investigated by XRD Methods The reduction mechanism was analyzed. The results show that under certain conditions, the metallization rate of the directly reduced agglomerates increases with the increase of the temperature, but the increase of the metallization rate gradually decreases after the reduction temperature exceeds 1,200 ℃ because the reduction temperature is higher than 1 200 ℃ , The reduction of iron oxides in the metalized briquettes tended to be gentle and the reduction of the iron-titanium compounds was relatively slow. With the extension of the reaction time and the increase of the carbon ratio, the briquette metallization showed the first increase Reducing the trend, mainly due to the reaction time is too long so that the re-oxidation of metal clumps and the amount of pulverized coal into the ash led to more, to a certain extent, hindered the reduction reaction smoothly, resulting in Metallization rate is reduced.