University of Oulu

Li, Y.; Chen, H.; Hammam, A.;Wei, H.; Nie, H.; Ding, W.; Omran, M.; Yan, L.; Yu, Y. Study of an Organic Binder of Cold- Bonded Briquettes with Two Different Iron Bearing Materials. Materials 2021, 14, 2952. https://doi.org/10.3390/ma14112952

Study of an organic binder of cold-bonded briquettes with two different iron bearing materials

Saved in:
Author: Li, Ying1; Chen, Huiting1; Hammam, Abourehab1,2;
Organizations: 1State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, 99 Shangda Rd, Shanghai 200444, China
2Central Metallurgical Research and Development Institute (CMRDI), P.O. Box 87, Helwan, 11421 Cairo, Egypt
3Process Metallurgy Research Unit, University of Oulu, Pentti Kaiteran Katu 1, 90014 Oulu, Finland
4Chongqing Zhenyan Energy Saving and Environmental Protection Technology Co., Ltd., 3, 10 Yueguang Village, Xin Street, Chongqing 400084, China
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 7.4 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021061537419
Language: English
Published: Multidisciplinary Digital Publishing Institute, 2021
Publish Date: 2021-06-15
Description:

Abstract

The aim of this study was to investigate the properties of an organic binder used in cold-bonded briquettes (CBBs) prepared from two different iron bearing materials. The applied binder is a type of starch as indicated by chemical analysis, iodine-starch staining and Fourier transform infrared analyses. Thermogravimetric differential scanning calorimetry showed that the binder pyrolysis undergoes four stages: moisture desorption, ash volatilization, pyrolysis of organic matter and decomposition of materials with high activation energy. The difference between the dry and heat-treated samples during the macroscopic failure process is the instability propagation of the crack. The CBB shows a low decrepitation index at 700 °C. The returned fines of CBBs used with the organic binder were applied in two blast furnaces. The industrial trials showed that the CBBs do not influence the performance of the blast furnace and can reduce the fuel consumption rate. The curing rate of the binder decreases, and the growth rate of compressive strength decreases during the curing process. Iron ore particles are bonded together and exist in the form of aggregation after mixing with water and binder. The edges and corners of the particles become blurred, and the original surfaces of the particles are covered with binder film, the surface of which is covered with fine particles. The multi-branched structure of amylopectin provides omnibearing adhesion sites, thus forming binder agglomeration and film leading to a strong adhesion between binder and iron ore particles. Binder film and binder agglomeration work together to make the CBB perform well.

see all

Series: Materials
ISSN: 1996-1944
ISSN-E: 1996-1944
ISSN-L: 1996-1944
Volume: 14
Issue: 11
Article number: 2952
DOI: 10.3390/ma14112952
OADOI: https://oadoi.org/10.3390/ma14112952
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: This work was supported by the Chongqing Zhenyan Energy Saving and Environmental Protection Technology Co., Ltd. (Chongqing, China); National Natural Science Foundation of China under grant no. (51974182) and Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning under grant no. (TP2015039).
Dataset Reference: Data are contained within the article and can be requested from the corresponding author.
Copyright information: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/