小块焦对碱性烧结矿和酸性球团矿还原行为的影响  

Influence of nut coke on the reducibility of basic sinter and acidic pellets

作　　者：E A Mousa D Senk A Babich 许海法 

机构地区：[1]亚琛工业大学

出　　处：《世界钢铁》2013年第4期27-34,共8页World Iron & Steel

摘　　要：为了降低焦炭的消耗,在含铁炉料中混加小块焦已成为现代高炉常规的操作措施。模拟高炉炉身的冶炼条件,研究了小块焦对碱性烧结矿和酸性球团矿还原行为的影响。模拟还原过程在不同的煤气成分、900～1250℃的等温条件和400～1250℃非等温条件下进行。等温还原试验结果表明:未混加小块焦时,球团矿和烧结矿分别在1050℃和1100℃出现还原停滞现象;而混加小块焦后,烧结矿和球团矿还原过程中的停滞现象被抑制,还原性也得到了改善。非等温还原试验结果表明:随着含铁炉料料层中的小块焦数量的增加,炉料的还原性得到改善。比较了小块焦对烧结矿和球团矿还原性影响的差异。采用光学显微镜和扫描电子显微镜,对烧结矿和球团矿混加或未混加小块焦,在不同温度下的还原机理进行了微观分析研究。Mixing of nut coke in the iron burden layers comes into regular application in the modern blast furnace in order to decrease the coke losses. The present study aims at investigation of the influence of nut coke on the reduction behaviour of basic sinter and acidic pellets under simulated shaft blast furnace conditions. The reduction processes have been simulated isothermally at temperature range of 900 - 1 250℃ and nonisothermally at temperature range of 400 - 1 250℃ using different gas mixtures. The isothermal reduction behaviour of pellets and. sinter without nut coke participation exhibited reduction retardation at temperatures above 1 050℃ and 1 100℃ respectively. The mixing of nut coke with sinter or pellets inhibited the reduction retardation phenomenon and improved the reducibility of iron burden materials. The nonisothermal reduction exhibited that, as the amount of nut coke in iron burden bed increases the reducibility increases. Differences in sinter and pellets reducibility affected by nut coke are compared. The microstructure analysis has been carried out with optical and scanning electron microscope to investigate the reduction mechanism of both sinter and pellets with and without nut coke use in the mixture at different temperatures.

关 键 词：高炉 烧结矿 球团矿 小块焦 透气性 气体还原 

分 类 号：TF046.6[冶金工程—冶金物理化学]