钒钛铁精矿非自然碱度含碳球团高温固态还原试验

Experiment on solid state reduction of non-natural basicity carbon-containing pellet of vanadium-bearing titanomagnetite at high temperature

为了研究钒钛铁精矿非自然碱度含碳球团高温固态还原规律,以钒钛铁精矿为原料,在实验室条件下,探索了还原温度、还原时间、碱度和配煤比对钒钛铁精矿非自然碱度含碳球团高温固态还原的影响,采用X射线衍射仪测定了金属化球团的物相组成。研究结果表明,适当提高还原温度、延长还原时间、提高碱度和配煤比均可促使球团的金属化率提高;对于钒钛铁精矿金属化球团物相组成,在还原温度高于1 400℃时,金属化球团中出现大量碳氮化钛,碱度的提高有利于抑制还原产物中碳氮化钛的生成,配煤比的增加促进了碳氮化钛的生成。从后续熔分工序对钒钛铁精矿金属化球团质量要求的角度来说,高温固态还原的适宜条件,还原温度为1 350℃,碱度为1.0,还原时间为30 min,配煤比为1.3,在此条件下,球团的金属化率为93.72%,金属化球团碳质量分数为6.08%,主要物相为黑钛石和金属铁。

In order to investigative the high temperature solid state reduction law of non-natural basicity carbon-containing pellet of vanadium-bearing titanomagnetite,with vanadium-bearing titanomagnetite as raw materials,effects of reduction temperature,reduction time,alkalinity and carbon ratio on solid state reduction of non-natural basicity carboncontaining pellet of vanadium-bearing titanomagnetite at high temperature were studied in the laboratory,and the phase compositions of metallization pellet were determined by X-ray diffraction analysis.The results show that the metallization ratio of the pellet increases with reasonable control of reduction temperature,reduction time,basicity and increased carbon ratio.The Ti CN of the metallization pellet has been produced when the reduction temperature is above 1 400 ℃.The Ti CN formation might be restrained by increasing the basicity,and increasing carbon ratio was favorable to the formation of Ti CN.The optimal solid state reduction conditions for the quality requirements of metallization pellet in the subsequent melting process are as follows,reduction temperature of 1 350 ℃,basicity of 1.0,reduction time of 30 min,and carbon ratio of 1.3.Under the optimal conditions,the metallization ratio and carbon content of the pellet are 93.72% and 6.08%,respectively,and the main phase of metallization pellet are anosovite and iron.