生物质合成气直接还原铁矿-生物质复合球团炼铁

为了使炼铁工业摆脱对化石能源的依赖及满足越来越严格的环境要求,将生物质能的开发利用与直接还原技术进行集成提出一种新型的绿色炼铁方法.把生物质、铁矿石粉与添加剂混合制取生球团,利用生物质催化气化制备的富氢合成气作为还原剂,生物质的高温燃烧为生球团的预热和预热球团的直接还原提供外加热源.对影响生物质直接还原炼铁的因素,如预热、还原温度及球团粒径进行了研究,发现减小球团粒径、增加预热和还原温度能够提高直接还原铁产品的全铁质量分数及金属化率.当采用品位65.21%的铁精矿为原料,在最优操作条件下(生球团粒径介于8~10 mm之间,900℃预热30 min,1000℃下还原60 min)可制得全铁TFe质量分数为86.1%,金属化率为94.9%的高质量直接还原铁产品. 

Ironmaking by direct reduction of iron ore-biomass composite pellets using biomass syngas

In order to ease the shortage of fossil energy and to come up to the stricter effluent standard, this article introduces an innovative green ironmaking technology integrated of the direct reduction process and the development and utilization of biomass energy. Biomass was mixed together with iron ore powder and additives for producing green pellets. Hydrogen-rich syngas produced by biomass catalytic gasification was used as a reducing agent, and the heat produced by biomass combustion was used as the heat source of pellet preheating and reduction. Investigations on the effects of preheating, reduction temperature and green pellet size on the quality of direct reduction iron (DRI) show that increasing the preheating and reduction temperature and decreasing the pellet size can improve the quality of DRI. When iron concentrate with the iron grade of 65.21% was taken as raw materials, high-quality DRI with the total iron TFe of 86.1% and the metallization rate of 94.9% can be obtained at optimum operation conditions (pellet size of 8 to 10 mm, preheating at 900℃for 30 min and reduction at 1000℃ for 30 min).