Fundamental Study on Carbon Composite Iron Ore Hot Briquette Used as Blast Furnace Burden |
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Authors: | Chu Man‐sheng Liu Zheng‐gen Wang Zhao‐cai Yagi Jun‐ichiro |
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Affiliation: | 1. Institute of Ferrous Metallurgy, Northeastern University, Shenyang 110004, China;2. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Japan |
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Abstract: | Carbon composite iron ore hot briquette (CCB) is the product of fine iron ore and fine coal by hot briquetting process, which attracts more and more attention as a new type of ironmaking raw materials aiming to improve the operation efficiency and reduce the coke consumption of blast furnace. This paper is devoted to experimental study on metallurgical properties of CCB and numerical simulation of the BF operation with CCB charging. At first, the metallurgical properties of CCB, including cold crushing strength, RDI, RSI, reducibility, high temperature strength, and softening and dripping are experimentally tested and compared with the common burdens, which revealed that the CCB possesses the required metallurgical properties and is suitable to use as the blast furnace burden. Then, the effects of charging CCB on the dripping properties of comprehensive burdens are elucidated based on the experiments under simulated blast furnace conditions. The results showed that the maximum charging ratio of CCB in the iron burdens is 40%–50% for achieving appropriate dripping properties of the mixed burdens. Finally, a multi‐fluid blast furnace model is used to simulate BF operation with CCB charging. According to model simulations, charging CCB will cause the temperature level to decreases in the furnace and the location of the cohesive zone shifts downward. On the other hand, the productivity tends to increase while coke rate and total reducing agent rate decrease, the heat efficiency improves remarkably and the operation performance of BF is effectively enhanced. |
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Keywords: | blast furnace carbon composite iron ore hot briquette ironmaking burden multi‐fluid model |
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