Metall. Res. Technol.
Volume 114, Number 4, 2017
|Number of page(s)||6|
|Published online||03 July 2017|
Effect of slag on strength of direct reduced iron produced with dust briquettes
University of Science and Technology,
Beijing, PR China
* E-mail: email@example.com
Received in final form: 17 January 2017
Accepted: 2 June 2017
The process of dust treatment with rotary hearth furnace is widely used in China, but the Direct Reduced Iron (DRI) produced with dust briquettes is prone to cracking, low strength and even crushing. So, the study on metallized pellets consolidation mechanism has an important guiding significance for the production practice. Mixture of conventional dusts briquettes were roasted at 800∼1300 °C, then their compressive strength was measured. SEM-EDS analysis and FactSage simulations were done to research the effect of slag phase. The results indicated that DRI strength increases with increasing temperature and decreases with increasing carbon content. Changes of FeO and MnO content could significantly reduce the liquidus temperature of the slag. Liquid slag could bond all kinds of mineral particles and make metallic iron to form interconnected metallic iron bonding phase like network which is the skeleton to ensure the high strength.
Key words: dust / DRI / slag phase / strength
© EDP Sciences, 2017
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