Study on the chemical chain combustion reactivity of copper-iron composite oxygen carrier prepared by Bayan Obo iron ore concentrate and CuO
Bayan obo iron ore,coexisting with multiple valuable minerals such as iron and rare earth elements,ex-hibits high reactivity,abundant resources,and low cost.By employing the calcination synthesis method,a mixture of this ore with copper oxide is prepared into a spinel CuFe2O4 oxygen carrier,aiming to develop a performance-op-timized,cost-effective,and environmentally friendly oxygen carrier for chemical looping combustion.The reduc-ibility and cyclic stability of the oxygen carrier were investigated through thermogravimetric analysis and small fixed-bed experiments,complemented by XRD characterization for an in-depth analysis of reaction characteristics and mechanisms.The results demonstrate that the addition of copper significantly enhances the activity of the iron concentrate oxygen carrier,improves the high-temperature resistance and anti-sintering stability of the copper ox-ide oxygen carrier,and forms a more stable spinel structure of CuFe2O4,exhibiting excellent synergistic effects.The CO program warming test illustrated that the reduction reaction of the copper-iron composite oxygen carrier primarily involves CuFe2O4,proceeding in three stages:in the first stage,CuFe2O4 is reduced to Cu and Fe3O4 at low temperatures with the highest reactivity;the second and third stages involve the reduction of Fe3O4 to FeO and then FeO to Fe,respectively.During 26 reduction-oxidation cycles,the CuFe900 oxygen carrier displayed no sig-nificant sintering,maintaining good reactivity and cyclic stability.
chemical-looping combustionoxygen carrierBayan Obo iron concentratespinel CuFe2O4calcina-tion condition
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