Abstract: The reduction degradation behavior of iron ore sinter under different temperatures was studied by adapting kinetic reduction to simulate a blast furnace process, and the influence of coal gas composition on the reduction degradation examined. The results show that the reduction degradation process of sinter in blast furnace can be divided into three stages, the most dramatic degradation behavior occurs between 400℃ and 600℃ as the second reduction stage, the reduction degradation index (RDI) can reach as high as 50.2%, accounting for 48.5% RDI of all reduction stages, the reduction index (RI) is still at a low value of 15.39%, only 17.9% of the whole reduction stage, the medium diameter of sinter decreases to 3.91 mm. Increasing the content of H2 can raise RDI to some degree, but the increment decreases. Increasing the content of CO2 in coal gas can somewhat decrease the DI, but the reduction slows down.

Key words: iron ore sinter, pulverization, reduction degradation index, reduction index, coal gas, blast furnace

摘要： 以连续性煤气升温模拟高炉生产过程，研究烧结矿的粉化行为，考察了煤气成分对烧结矿低温还原粉化的影响. 结果表明，可将烧结矿在高炉内的低温还原粉化过程分为3个阶段，粉化最剧烈的是第二阶段(400~600℃)，此阶段烧结矿粉化指数达50.2%，占整个还原阶段粉化指数的48.5%，还原度却只有15.39%，占整个还原度的17.9%，中值粒径为3.91 mm. 增加还原煤气中的H2比例可增加烧结矿的粉化指数，但增加幅度逐渐降低；增加还原煤气中CO2比例可降低烧结矿的粉化指数，但降低幅度逐渐减小.

关键词: 烧结铁矿, 粉化, 还原粉化指数, 还原度, 煤气, 高炉