CARBONIZATION OF COALS MIXED IRON ORE FINES AND GASIFICATION OF RESULTING IRON COKE WITH CO_2: TRANSFORMATION OF IRON MINERALS AND COKE PROPERTIES

摘要

It is important to produce and utilize highly reactive coke in order to reduce the energy consumption and CO_2 emissions through improving shaft efficiency in blast furnace. The present study aimed to investigate the transformation of iron minerals and properties of iron coke (the coke mixed iron ore fines). Along with the increase of iron ore fines, cold strength displayed a slight downtrend and the pore structure wasn't inferred to be a major factor affected the properties of iron coke. During carbonization, the majority of mixed iron oxides were reduced to metallic iron by CO and H_2 and the degree of metallization achieved to approximately 75%. Nevertheless, produced metallic iron was oxidized by pure CO_2 during gasification. Iron coke reactivity index (ICRI) was obviously enhanced and the iron coke strength after reaction (ICSR) drastically decreases, which were also significantly influenced by crystal structure of carbon.