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| Study on reaction performance of oxygen carrier prepared by in-situ reduction of modified iron concentrate |
| MA Xinyu1，LI Xin1，ZHANG Shunfeng1，HAN Aimin1，CHEN Weipeng1，2 |
| （1.School of Energy and Environment, Inner Mongolia University of Science and Technology，Baotou 014010，
China；2.Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner
Mongolia University of Science and Technology, Baotou 014010, China） |
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Abstract In chemical chain combustion, iron-based oxygen carriers are prone to sintering and agglomeration dur‐
ing reduction-oxidation cycles in high temperature environments. In response to this problem, a new experimental
idea is proposed in this paper, namely, the preparation of Al-modified oxygen carriers by in-situ reduction, aiming
to improve the anti-sintering and agglomeration properties of the oxygen carriers. The modified oxygen carriers of
Bayan Obo iron-based powder with different Al/Fe material ratios were prepared by in-situ reduction method, and
the CO constant temperature reduction experiment and reduction-oxidation cycle experiment were carried out on a
thermogravimetric analyzer. The effects of reaction temperature and the ratio of Al/Fe species on the reduction per‐
formance and cycle performance of the oxygen carrier were investigated and analyzed. The oxygen carriers were
characterized by XRD, SEM and BET. With the increase of Al addition in the oxygen carrier, Al13Fe4 and Al2Fe
crystalline product is formed. The specific surface area and pore volume of the modified oxygen carrier are the largest when the ratio of Al/Fe material is 2:8. The reduction conversion of the modified oxygen carrier in the isother‐
mal reduction process is mainly divided into two stages, and the addition of Al improved the conversion rate of the
second stage. The modified oxygen carriers exhibited good anti-sintering and agglomeration properties during multiple reduction-oxidation cycles. The increase of the addition amount of Al will reduce the surface area of the modi‐
fied oxygen carrier and reduce the CO reduction of the oxygen carrier. The addition of Al can accelerate the conver‐
sion of the oxygen carrier FeO to the Fe stage during CO reduction. The reduction-oxidation cycle of modified oxy‐
gen carriers has a reactive activation process. The modified oxygen carrier with an Al/Fe material ratio of 2:8 exhib‐
ited good anti-sintering and agglomeration properties during multiple reduction-oxidation cycles.
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Received: 27 October 2021
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2022, Vol. 32 
