Effect of finely ground limestone and dolomite on compression strength and reduction swelling of vanadium-titanium pellets
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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2021-08-07
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
Series
Materials, Volume 14, issue 16
Abstract
Vanadium−titanium magnetite (VTM) is an important raw material for ironmaking under the situation of increasingly demanding scarce resources. To further improve the metallurgical properties of pellets, and to satisfy the requirements of blast furnace slag basicity, finely ground dolomite and limestone have been added to the pellet. In this study, the effect of finely ground dolomite and limestone on the metallurgical properties (green pellet drop strength, cold compression strength, reduction swelling index, and microscopic mineral structure) of VTM pellets were investigated. With the addition of finely ground dolomite and limestone, the drop strength of the green pellet was improved. The effect of adding finely ground limestone was greater than adding finely ground dolomite. Adding more finely ground dolomite and limestone compared to pellets without limestone and dolomite, the cold compression strength was decreased, which was attributed to the decomposition of limestone and dolomite during the induration of pellets. With the addition of dolomite, the reduction swelling index (RSI) increased firstly and then decreased. When the basicity of the pellet was 0.54 to 0.94, the slag phase with the lowest melting point was formed, corresponding to the maximum of the reduction swelling index. For the pellets with added limestone, the reduction swelling of the pellets deteriorated. The reduction index of the pellets increased and reached the maximum (26.6%) at a basicity of 1.54, which belongs to abnormal swelling.Description
Funding Information: This work was supported by the Natural Science Foundation of Chongqing. (No. cstc2020jcyj-msxmX0583); The National Natural Science Foundation of China Grant No. 51974054); the Youth project of science and technology research program of Chongqing Education Com-mission of China. (No. KJQN202001534); Sciences Foundation of Chongqing, China (No. cstc2020jcyj-msxmX0229), and the Provincial and Ministerial Co-constructive of Collaborative Innovation Center for MSW Comprehensive Utilization (No. shljzyh2021-17). Graduate Science and Technology Innovation Project of Chongqing University of Science and Technology. (No. YKJCX2020225). Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords
Dolomite, Limestone, Microstructure, Vanadium titanium pellets
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Citation
Liu , H , Peng , S , Zhang , K , Qin , Y , Meng , F , He , W , Liu , W , Chen , M & Yan , L 2021 , ' Effect of finely ground limestone and dolomite on compression strength and reduction swelling of vanadium-titanium pellets ' , Materials , vol. 14 , no. 16 , 4433 . https://doi.org/10.3390/ma14164433
