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Korean Journal of Metals and Materials > Volume 55(1); 2017 > Article
Korean Journal of Metals and Materials 2017;55(1): 24-30. doi: https://doi.org/10.3365/KJMM.2017.55.1.24
산화성분위기에서의 탄재 내장 산화철 브리켓의 환원특성
이기우1, 김강민1, 권재홍1, 손상한2, 한정환1
1인하대학교 신소재공학과
2포스코 기술연구원 제선연구그룹
Reduction Behaviors of Carbon Composite Iron Oxide Briquette Under Oxidation Atmosphere
Ki-Woo Lee1, Kang-Min Kim1, Jae-Hong Kwon1, Sang-Han Son2, Jeong-Whan Han1
1Division of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea
2Ironmaking Research Group, Technical Research Laboratories, POSCO, Pohang 37859, Republic of Korea
Correspondence  Jeong-Whan Han ,Tel: +82-32-860-7543, Email: jwhan@inha.ac.kr
Received: 12 April 2016;  Accepted: 9 August 2016.  Published online: 5 January 2017.
ABSTRACT
The carbon composite iron oxide briquette (CCB) is considered a potential solution to the upcoming use of low grade iron resources in the ironmaking process. CCB is able to reduce raw material cost by enabling the use of low grade powdered iron ores and coal. Additionally, the fast reduction of iron oxides by direct contact with coal can be utilized. In this study, the reduction behaviors of CCB were investigated in the temperature range of 200-1200 ℃ under oxidizing atmosphere. Briquettes were prepared by mixing iron ore and coal in a weight ratio of 8:2. Then reduction experiments were carried out in a mixed gas atmosphere of N2, O2, and CO2. Compressive strength tests and quantitative analysis were performed by taking samples at each target temperature. In addition, the reduction degree depending on the reaction time was evaluated by off-gas analysis during the reduction test. It was found that the compressive strength and the metallization degree of the reduced briquettes increased with increases in the reaction temperature and holding time. However, it tended to decrease when the re-oxidation phenomenon was caused by injected oxygen. The degree of reduction reached a maximum value in 26 minutes. Therefore, the re-oxidation phenomenon becomes dominant after 26 minutes.
Keywords: iron oxide, reduction degree, SEM, strength, off-gas analysis
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