| Title | Mill scale and flue dust briquettes as alternative burden to low height blast furnaces |
|---|---|
| ID_Doc | 25423 |
| Authors | Bagatini, MC; Fernandes, T; Silva, R; Galvao, DF; Flores, IV |
| Title | Mill scale and flue dust briquettes as alternative burden to low height blast furnaces |
| Year | 2020 |
| Published | |
| Abstract | The present work evaluated the behavior of self-reducing briquettes produced from mill scale and blast furnace flue dust at high-temperature and reducing atmosphere conditions, aiming to recycle these wastes through low height blast furnaces. Briquettes prepared in three different carbon/oxygen mass ratios were submitted to interrupted high-temperature tests in CO-reducing atmospheres and evaluated in terms of reduction and mechanical strength behavior. Metallic iron was identified in the samples obtained even at low temperature and moderate CO partial pressure, which revealed the high reducibility of these briquettes comparatively to lump iron ores. It was observed that self-reducing reactions play an important role at low temperatures (up to 900 degrees C), while at high temperatures the external atmosphere had a greater influence. The mechanical strength of the briquettes was strongly affected by self-reducing reactions and the proportions of wastes. At 900 degrees C the briquettes swelled, which was more pronounced when blast furnace flue dust increased in the briquettes. Briquettes with the lowest carbon/oxygen mass ratio (0.25) presented the best performance to use in blast furnaces reactors. A mass balance considering this briquette for recycling mill scale and blast furnace flue dust from integrated steel mills through low height charcoal blast furnace showed to be an attractive route to improve the sustainability of iron and steelmaking industry. (c) 2020 Elsevier Ltd. All rights reserved. |
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