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介绍了FINEX、FINMET、Circored和HIsmelt等几种典型熔融还原工艺采用流化床处理粉铁矿的技术及特点。总结了熔融还原中采用流化床处理粉铁矿应遵循的原则。参考国内外有关流化床处理粉铁矿的实践经验,提出了一种采用流化床处理粉铁矿的熔融还原炼铁新工艺流程,按照冶金功能分为4个系统:使用约800℃的还原煤气生产还原度约80%的DRI的流态化预热预还原系统;直接使用粉煤、高温高预还原度炉料、纯氧冶炼,二次燃烧率控制在20%左右的铁浴终还原系统;具有调节和变换终还原高温煤气和循环使用炉顶煤气功能的煤气改质系统;解决输出煤气利用的综合利用系统。
The technology and characteristics of fluidized bed treating iron ore with several typical methods of reduction and reduction, such as FINEX, FINMET, Circored and HIsmelt, are introduced. Summarized the principle of fluidized bed treatment of iron ore powder in melting reduction. Reference to the domestic and international practice of fluidized bed treatment of iron ore, put forward a fluidized bed treatment of iron ore iron ore smelting reduction process, according to the metallurgical function is divided into four systems: the use of about 800 ℃ Reduction of gas production of about 80% reduction in the degree of DRI fluidized preheater pre-reduction system; direct use of pulverized coal, high temperature and high pre-reduction charge, pure oxygen smelting, secondary combustion rate control in 20% iron bath final reduction System; with the regulation and transformation of the final reduction of high-temperature gas and gas top-fired gas recycling system; to solve the comprehensive utilization of gas output utilization system.