微波硅热还原铬铁矿粉制备低碳铬铁  

Preparation of Low-carbon Ferrochromium from Chromite Fines by Microwave Silicothermic Reduction

作　　者：李磊[1] 朱红波[1] 彭金辉[1] 张利波[1] 代林晴[1] 吴奎霖[1] 

机构地区：[1]云南省特种冶金重点实验室,微波能工程应用及装备技术国家地方联合工程实验室,省部共建复杂有色金属资源清洁利用国家重点实验室,昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《钢铁钒钛》2015年第4期134-139,共6页Iron Steel Vanadium Titanium

基　　金：云南科技创新人才计划-科技领军人才(NO.2013HA002)资助

摘　　要：为高效利用铬铁矿粉,提出微波硅热还原铬铁矿粉冶炼低碳铬铁新工艺。采用Fact Sage软件对三元渣系(Si O2-Ca O-Cr2O3)和二元渣系(Si O2-Ca O)进行模拟,在模拟值基础上通过试验找出最佳工艺条件。结果表明:终点温度1 450℃,渣系二元碱度1.64条件下,反应过程中渣金可以实现良好分离,铬回收率达到81.03%。对产物物相和化学成分进行XRD、XRF分析可知,合金中不含渣相,其化学成分满足Fe Cr55C25Ⅱ牌号的要求。通过合金典型区域SEM图和X-射线能谱分析发现晶粒中含有少量Si杂质,碳主要存在于晶界上。To achieve chromite fines resources utilization effectively,the new process of preparation of low-carbon ferrochromium from chromite fines by microwave silicothermic reduction was investigated.Fact Sage software was used to simulate the ternary slag（ Si O2-Ca O-Cr2O3） and the binary slag（ Si O2-Ca O）,in order to generate the optimum technological conditions in combination with experimental data.The results show that with combining parameters of final temperature at 1 450 ℃ and binary basicity of1. 64,ferrochrome and slag can be entirely separated during the reaction and the recovery of chromium reach to 81. 03%. XRD and XRF analysis on the phase and chemical composition of the products indicate that ferrochrome does not contain the slag and its chemical composition meet the standard of Fe Cr55C25Ⅱ. SEM observation and EDX analysis show that crystalline grain contains tiny amounts of Si and C mainly distribute in the grain boundary.

关 键 词：铬铁矿 微波加热 硅热法 熔渣 低碳铬铁 

分 类 号：TF641[冶金工程—钢铁冶金] TM924.76[电气工程—电力电子与电力传动]