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| Overseas research advances in evaluation methods of high-temperature fundamental sintering characteristics of iron ores |
| YANG Cong-cong1,2, ZHU De-qing1,2, PAN Jian1,2, GUO Zheng-qi1,2 |
1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China;
2. Low Carbon and Hydrogen Metallurgy Research Center (CSU-LCHMC), Central South University, Changsha 410083, Hunan, China |
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Abstract Due to the increasing depletion of high-grade iron ore resources and the diminishing quality of iron ore sinter feeds, the steel mills at home and abroad are facing with problems that sintering raw material supply is unstable, iron ore property fluctuates greatly and raw material structure changes frequently, which has great adverse effect on sintering production, blast furnace smelting and product quality. Therefore, it's of great significance to conduct evaluations of fundamental sintering characteristics of iron ores. The basic properties of iron ores can be classified into two categories, i.e., cold and high-temperature characteristics. The former mainly includes the chemical composition, particle size distribution and mineralogical characteristics, etc., while the latter generally includes high-temperature mineralization behavior, such as assimilation, liquid phase formation characteristics of iron ores as well as the real sintering performance. This article mainly summarizes the overseas research advances in the evaluation of high-temperature fundamental sintering characteristics of iron ores. Meanwhile, the evaluation indexes and experimental methods proposed by various research institutions are summarized systematically. The previous studies show that, although the existing evaluation methods based on compact sintering provide deep insight into different sintering behavior of iron ores, it's still difficult to build accurate and reliable relationship with the real sintering performance. The main reason is that the key factors affecting the actual sintering performance of iron ore are not well understood, and the evaluation methods needs to be improved to simulate the real sintering conditions as much as possible. Therefore, to reveal the internal relations between fundamental sintering characteristics and its sintering performance of iron ore, the first premise is to develop deep understanding about the transfer law of the properties for materials derived from different operational stages, notably “iron ores-granules-sinter”. It is of great significance to find out the main factors influencing the iron ore sintering process, which can provide a proper breakthrough point for the evaluation of high-temperature fundamental sintering characteristics of iron ores.
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Received: 21 October 2021
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2022, Vol. 57 
