발간논문

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Vol.33, No.6, 714 ~ 722, 1995
Title
Reduction behavior of Fine Iron Oxide by Injection of Mixture of Pulverized Coal Char and Iron Ore
강신명Sin Myoung Kang, 민동준Dong Joon Min, 주상훈Sang Hoon Joo, 이일옥Il Ock Lee
Abstract
The present study has been carried out to investigate the simultaneous behavior of fine ore melting and reduction in a combustion flame during the injection of the mixture of fine iron ore and pulverized coal char with oxygen. Coal char and iron ore(wustite, hematite) particles less than 150 ㎛ in diameter were used for the experiment. The atmospheric temperature of the chamber was set up at 1400℃. The injected weight ratio of Fein ore to in coal char changed from 0.33 to 2.66 and the mole ratio of O/C changed from 0.4 to 1.2. Experimental resuts show that main reduction mechanism of fine wustites is the direct reduction between molten wusitite and unburnt carbon. Similarly for the case of fine hematites, thermal decomposite to magnetite and direct reduction between molten magnetite and solid carbon entrained into the droplet are the main reduction mechanism because melting rate of thermally decomposed hematite is much faster than reduction rate of that by reducing gas. It was observed that reduction degree of fine iron oxide(wustite & hematite) mainly depends on specific combustion heat ratio(㎉/g-ore), the author proposes, which is defined as the ratio of combustion heat of coalchar to the weight of injected fine ore.
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