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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.
In order to get the ironmaking industry out of dependence on fossil fuels and to meet the increasingly stringent environmental requirements, a new green ironmaking method is proposed to integrate the development and utilization of biomass energy with direct reduction technology. The biomass, iron ore The mixture of the stone powder and the additive is used for preparing the pellet, and the hydrogen-rich syngas prepared by catalytic gasification of the biomass is used as a reducing agent, and the high temperature combustion of the biomass provides the external heat source for preheating the pellet and directly reducing the pellet. The factors influencing the direct reduction of biomass ironmaking, such as preheating, reduction temperature and pellet size, were studied. It was found that reducing the pellet size and increasing the preheating and reduction temperature can increase the total iron content of DRI products Fraction and metallization rate.When the iron ore concentrate with the grade of 65.21% was used as raw material, under the optimal operating conditions (raw pellet diameter is between 8 and 10 mm, preheating at 900 ℃ for 30 min and reducing at 1000 ℃ 60 min), a high quality direct reduced iron product with a total iron TFe content of 86.1% and a metallization rate of 94.9% can be obtained.