FERRUGINOUS CONGLOMERATED GRAIN BY PRODUCT GENERATED FROM DIRECT REDUCTION IRON MAKING MILL

摘要

PURPOSE:To obtain ferruginous conglomerated grains having substantial strength as an iron source by compounding cement with the powder dust generated in a reduction stage for ferruginous raw materials, pelletizing the mixture and curing and drying the conglomerated grains by means utilizing the waste gas of a reduction furnace. CONSTITUTION:The quicklime powder captured in a place where quicklime powder is generated is added to the sludge 3 captured by a dust collector 2 from the inside of the waste gas of the reduction furnace 1 and further the cement is added thereto; thereafter, the mixture is passed through a humidity controller 4 and is pelletized by a disk pelletizer 5. The pellets P1 are charged into a steam curing device 6 where the pellets are cured by the steam 10 generated by using part of the waste gas 7 from the reduction furnace as fuel and passed thereto from a steam generator 9. The cured pellets P2 are charged into a carbonization dryer 11. On the other hand, the gaseous CO2 7''' separated from the gas 7 by passing said gas through a CO2 remover 8 is added to the combustion gas of the generator 9 to form the gas 13 enriched with CO2 which is then passed through the dryer 11 and is brought into contact with the pellets P2. The pellets P2 are thus dried and hardened together with the carbonization of the lime component.