TY - JOUR

T1 - Evaluation of the Limiting Regime in Iron Ore Fines Reduction with H2-Rich Gases in Fluidized Beds: Fe2O3 to Fe3O4

AU - Sturn, Johannes

AU - Voglsam, Severin

AU - Weiss, Bernd

AU - Schenk, Johannes

AU - Winter, Franz

PY - 2009/2/25

Y1 - 2009/2/25

N2 - In metallurgical processes, fluidized-bed technology is gaining more importance because of its advantages. Processes with H2-rich and CO-rich reducing gases were developed for the reduction of iron ore fines (e.g. FINEX®). For improvement of these new technologies, greater knowledge about the chemical kinetics of iron ore reduction in fluidized beds is necessary. The scope of this work is to evaluate the limiting regime of the iron ore fines reduction. Therefore, experimental results of reduction tests were compared with theoretically investigated reduction rates. These reduction rates were based on a limitation either of mass transfer through the external gas film to the particle surface, diffusion in a porous product layer (pore diffusion and Knudsen diffusion), diffusion in a dense product layer (solid diffusion) or the phase boundary reaction. The phase boundary reaction was found to be the most likely limiting reaction regime.

AB - In metallurgical processes, fluidized-bed technology is gaining more importance because of its advantages. Processes with H2-rich and CO-rich reducing gases were developed for the reduction of iron ore fines (e.g. FINEX®). For improvement of these new technologies, greater knowledge about the chemical kinetics of iron ore reduction in fluidized beds is necessary. The scope of this work is to evaluate the limiting regime of the iron ore fines reduction. Therefore, experimental results of reduction tests were compared with theoretically investigated reduction rates. These reduction rates were based on a limitation either of mass transfer through the external gas film to the particle surface, diffusion in a porous product layer (pore diffusion and Knudsen diffusion), diffusion in a dense product layer (solid diffusion) or the phase boundary reaction. The phase boundary reaction was found to be the most likely limiting reaction regime.

KW - Fluidized beds

KW - H-rich gases

KW - Iron ore reduction

UR - http://www.scopus.com/inward/record.url?scp=65549152510&partnerID=8YFLogxK

U2 - 10.1002/ceat.200800579

DO - 10.1002/ceat.200800579

M3 - Article

VL - 32.2009

SP - 392

EP - 397

JO - Chemical Engineering & Technology

JF - Chemical Engineering & Technology

SN - 0930-7516

IS - 3

ER -