鲕状赤铁矿石熔融还原试验研究

Experimental study on oolitic hematile ore smelting reduction

本文开展了鲕状赤铁矿石熔融还原炼铁试验。首先采用X射线衍射(XRD)和光学显微镜分析了鲕状赤铁矿的矿物组成和矿物的分布情况,然后探讨了石灰(CaO)、还原剂的加入量、温度及保温时间对金属铁的回收率影响的工艺参数。通过试验分析得出金属铁中碳的质量分数与温度成y=0.002·e^(0.006 4T)的指数关系,TFe、P、S的质量分数与温度成线性关系。还原反应热力学及动力学计算表明:试验设定起始于1 350℃的熔融还原过程,固体碳C_((s))与溶解碳参与熔渣中[FeO]的还原反应,且C_((s))贡献度大于[C];随着还原反应温度升高,渣中[FeO]浓度C_(FeO)及[C]浓度C_([C])的变化对反应速率的影响随温度提高而逐步下降;反应速率常数随温度提高而增大。

Experimental study on oolitic hematile ore smelting reduction was carried out.X-Ray diffiraction(XRD) and optical microscopy obversition(OP) were employed to identify the mineral composition and distribution.The influence of additives,reduction temperature and holding time on metallic iron recovery rate was investigated.Analysis indicated that the carbon content in iron increased exponentially with temperature,the expression was y=0.002·e^(0.006 4T).Total ferrum,P,S content were all increased linearly with temperature.Thermodynamical and reaction kinetics analysis indicated that the solid carbon C_((s)) and dissolved carbon [C] participated in [FeO] reduction reaction,the main reactant was solid carbon.The effect of [FeO] and [C] concentration variation on reduction reaction rate decreased with temperature increase.The rate contant of reduction reaction inceased with temperature.