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| Swelling behavior of iron ore pellets for direct reduction in isothermal and temperature-rising conditions |
| BAI Ming-hua，FU Yuan-xiang |
| National Engineering Research Center for Equipment and Technology of Cold Strip Rolling， Yanshan University， Qinhuangdao 066004， Hebei， China |
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Abstract Experiments were conducted to study the swelling behavior of iron ore pellets in gas-based direct reduction process under two temperature conditions， that are the temperature-rising condition and the 900 ℃ isothermal condition. The two experimental results and the swelling mechanism were analyzed. Also， the difference of swelling behavior between the two reduction conditions was analyzed based on images of appearance and microstructure of the pellets after reduction. The results showed that the isothermal reduction led to higher reduction swelling index(RSI) compared with the temperature-rise reduction， with the RSI respectively 18.3% and 8.3%. The appearance and microstructure of the pellets after reduction showed that the more the cracks and pores， the higher the RSI，which was also one of reasons for the higher RSI in the isothermal reduction. In addition， the crystallization of metallic iron was another important reason for the higher RSI. Therefore， to obtain the experiment result of the swelling behavior closing to the actual production process， the experiment should be conducted in the temperature-rising condition or simulated condition.
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Received: 04 August 2014
Published: 11 June 2015
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2015, Vol. 50 
