利用CO-CO_2-H_2混合气体生产碳化铁的实验研究

Study on Iron Carbide Production with CO-CO_2-H_2 Mixing Gas

通过热力学计算,讨论了利用CO-CO_2-H_2混合气体生产碳化铁的可行性,并在实验室小型流化床反应器内使用CO-CO_2-H_2混合气体进行铁矿石还原实验,分别讨论了反应温度、系统压力、H_2含量、CO/CO_2比值等因素对碳化铁生成的影响．扩大化的公斤级流化床实验表明,当反应时间为150 min时,铁矿石还原度超过95％,反应时间180 min时碳化铁率达到90％左右．

High grade scrap steel in the global market appears in the situation of demand exceeding supply with rapid development of short flow steelmaking, and iron carbide as a type of substitute for high grade scrape has some distinct advantages, its technology and production have become a focus in these years. In this work, the thermodynamic analysis was carried out to discuss the iron carbide production by using CO-CO2-H2 mixing gas, then, the reduction experiment of iron ore by using CO-CO2-H2 mixing gas was performed in a fluidized bed, and the key influential factors on iron carbide production, including temperature, system pressure, H2/2 content and CO/CO2 ratio, were investigated respectively. The experimental result of a kilogram-scale fluidized bed showed that the reduction grade exceeded 95% with 150 min reduction time, and after 180 min, iron carbide yield achieved about 90%.