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Enhanced Reduction of Coal‐Containing Titanomagnetite Concentrates Briquette with Multiple Layers in Rotary Hearth Furnace
Author(s) -
Hu Tu,
Lv Xuewei,
Bai Chenguang
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500119
Subject(s) - briquette , materials science , coal , layer (electronics) , metallurgy , reduction (mathematics) , raceway , composite material , waste management , geometry , mathematics , engineering , lubrication
The enhanced reduction of coal‐containing titanomagnetite concentrates (TC) briquette with a three‐layer bed are investigated using a electric furnace containing three heating zones under argon atmosphere, simulating the heating regime similar to those that exist in an actual RHF. It is found that the reduction rate of the briquette on the top layer is greatly higher than that on the middle and bottom layers for a three‐layer bed reduction. It is impossible that the whole bed reaches complete reduction without reoxidation of reduced briquettes of top layer. It is observed that bigger briquettes on the top layer decreased the reduction rates of briquettes on the lower layers due to the more shielding of radiation. Ferrosilicon (Fe–Si) is used for increasing the reduction rate of the briquettes on the lower layers, which is found to be accelerated. The whole bed simultaneously reaches a high metallization degree with a shorter reduction time. It is revealed that using a multi‐layer bed of TC–coal composite briquettes in RHF could be achieved by accelerating the reduction rates of briquettes with appropriate amount of Fe–Si addition for different lower layers.