Characterization of Cold Bonded Iron Ore - Coal/Coke Composite Briquettes/Pellets

摘要

Composite briquettes/pellets can be readily prepared from iron ore and coal/coke fines by cold bonding technique using various binder combinations. Further, the composites are hardened by a process involving physico-chemical changes of the binder at room/low temperature. The composites bear enough strength to withstand high temperature and thermal stresses and, in addition, intimacy of iron ore and coal/coke fine particles lead to faster reduction. The maximum compressive strength achieved were 700 N and 1600 N/briquette for ore - coal and ore - coke, respectively using 10 percent slaked lime plus 5 percent dextrose as binder. The strength of ore - coke were higher than that of ore - coal composites for all binder combinations. The bonding in composite briquette/pellet is due to formation of carbonates and silicates, as confirmed by X- ray diffraction.