Pre-reduced Material in Blast Furnace Charge

Abstract

The wide use of ox)'gen converter steel-making, coll/)Ied with the much illl/Hoved blast furnace process, and recent abundance of rich iron ore supplies have altered the whole steelmaking situation. Progress in the chemical indust./y did, for a time, spur the develo/)lI1ent of , direct reduction' processes, as the various methods of making iron withollt a blast furnace were called. However, blast furnace has become so e.Dicient that direct redllctioll processes are now aimed less at replacing the conventional /JI'ocess than at supplementing it. This sllp/Jlemenlmy /JI'ocess has come to be kllown as , pre-reduction,' since its product is to be subsequently treated by the conventional /Jrocess. Yawata Iron & Steel Co., Ltd. carried out a series of tests on olle /y/Je of IHe-reduced material, slJonge iron, and /Ha ctically confirmed that its lise reduced coke rate and increased iron output. Pre-reduction at mines ""D' be economical. BlIt , for the /Hesen t, although technically feasible , (He-redllction at j a/Janese steelworks has not yet /) roved economical.

Composite Pre-Reduced Pellet Quality as Affected by Reductant Reactivity

“…Sharmaet al reportedl 8) higher swelling "/* with increased reduction rate (upto 2"/. per min) by CO.…”

Effect of parameters on reduction behaviour of preheated converter sludge pellets in grate-rotary kiln process

“…Gupta and Gautam showed that the strength of the metallised pellet could be controlled by reduction temperature, sintering time, additive quality/quantity and manner of reduction [15]. Tsujihata et al found DRI strength values decreased from 200 to 30 kg during reduction and then strengthened up to 50 kg as a result of sintering and fusion [16]. Zhuang et al showed that the cold-bonded pellet has enhanced mechanical strength and quality of DRI can be improved through laboratory tests [6].…”