Effects of SiO2, CaO and basicity on reduction behaviors and swelling properties of fluxed pellet at different stages

Fluxed pellets are considered as an alternative iron-bearing burden to conserve the energy consumption and to reduce the emissions of blast furnace. In this work, the effects of SiO2, CaO, and binary basicity (w(CaO)/w(SiO2)) on the staged reduction of pellets were experimentally investigated under...

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Bibliographic Details
Published in:Powder technology Vol. 396; pp. 477 - 489
Main Authors: Wang, Ping, Wang, Chaoqiang, Wang, Hongtao, Long, Hongming, Zhou, Tianbao
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 01.01.2022
Elsevier BV
Subjects:
Basicity
Blast furnace ironmaking
Calcium oxide
Emissions
energy
Energy conservation
Energy consumption
Fluxed pellet
furnaces
Iron-bearing burden
Pellets
Reduction
Reduction swelling property
Silicon dioxide
Staged reduction
Swelling
Fluxed pellet
Blast furnace ironmaking
Staged reduction
Reduction swelling property
Iron-bearing burden
ISSN:0032-5910, 1873-328X
Online Access:Get full text
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Summary:Fluxed pellets are considered as an alternative iron-bearing burden to conserve the energy consumption and to reduce the emissions of blast furnace. In this work, the effects of SiO2, CaO, and binary basicity (w(CaO)/w(SiO2)) on the staged reduction of pellets were experimentally investigated under different conditions, and the related mechanism was elucidated. When the ratio of SiO2 increases from 0% to 7.00%, the reduction degree (RD) of pellets at stage 3 decreases from 93.89% to 75.87%, and the reduction swelling index (RSI) firstly reduces from 26.57% to −12.8% and then increases to −0.3%. Furthermore, with increasing the ratio of CaO, the reduction process of pellets is gradually accelerated, while the swelling performance of pellets shows the distinct differences for different reduction stages. Meanwhile, as the basicity of pellets increases from 0 to 1.33, the RSI of pellets at stage 3 firstly increases from −10.69% to 146.22% and then diminishes to 51.19%. [Display omitted] •The pellets used in this work are prepared with utilizing pure reagents.•The impact mechanisms of SiO2, CaO and basicity on the staged reduction behaviors of pellets were revealed.•The staged reduction swelling properties and mechanism of fluxed pellets were elucidated.
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ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2021.09.080