Premium
Reduction by CO‐CO 2 and cracking of iron ore sinters, part 1: kinetics
Author(s) -
Hbika Abdelmalek,
Dupré Bernhard,
Gleitzer Charles,
Marliere Elisabeth
Publication year - 1990
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199000367
Subject(s) - hematite , chemistry , magnetite , nucleation , cracking , reaction rate constant , metallurgy , mineralogy , kinetics , nuclear chemistry , materials science , physics , organic chemistry , quantum mechanics
A synthetic sinter has been prepared, and compared to an industrial ore, in order to obtain a better understanding of the mechanism and circumstances of degradation by cracking, during the low‐temperature reduction of hematite to magnetite, in the upper part of the blast furnace. In the present paper, some kinetic data on the reduction by CO 2 are reported. It appears that the Shrinking Core Model correctly applies in all conditions, even at low temperatures where there is significant cracking. The chemical rate constants and nucleation frequencies are derived and compared with our previous data obtained with natural isolated hematite single crystals. It is also confirmed that the reaction is first order versus carbon monoxide.