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| Hardening behavior and mechanism of a new type of binder on cold-bonded pellets |
| WANG Rong-rong，ZHANG Jian-liang，LIU Zheng-jian，LIU Yi-ran，LIU Xing-le，LI Nai-yao |
| （School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083，China） |
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Abstract Binder is essential in cold-bonded pellets， and currently widely used organic and inorganic binders will lose their strength at high temperatures， resulting in a serious decline in pellets’ strength， such as CMC， bentonite and cement， etc. Thus， looking for a type of binder which has great high temperature performance is the key problem needed to be solve. Effects of binder， used in this study， on the compressive strength of the pellets at room temperature and high temperature were investigated，XRD and SEM-EDS were used to study the performance of pellets and raw materials， and the mechanism was also discussed. Results show that the binder exists in a flowing state in cold-bonded pellets， which could adsorb or enclose the iron ore particles.The addition of binder ratio could improve the strength of the pellets at room temperature and high temperature.When pellets are roasted under high temperature and reducing atmosphere，metallization ratio of pellets increases for the reduction of pellets， which results in an increase of the interspace between iron ore particles and a decrease of pellets’ strength. The change of strength and metallization is the most obviously when pellets are roasted for 30-90 min. In the early stage of roasting， strength of pellets does not decrease rapidly as well as pellets using other binders， and pellets could still maintain 100 N/pellet after roasted.
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Received: 17 January 2017
Published: 14 November 2017
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2017, Vol. 52 
