Red brick doping modified Baiyun Obo iron ore concentrate oxygen carrier performance
The modified Baiyun Obo iron ore concentrate oxygen carrier was prepared by mechanical mixing method with the addition of red brick powder from construction solid waste,and the effect of red brick powder addition on CO chemical chain combustion performance was analyzed by thermogravimetric analyzer and tube furnace experiments,and the mechanism was analyzed by means of characterization such as SEM,XRD,BET,and kinetic analyses.Through the DTG curve,it could be seen that the reaction temperature of Baiyun Ebo iron ore concentrate carrier with CO was basically higher than 800℃,and the red brick powder modified carrier could enhance the chemical chain combustion reaction rate and accelerate the reaction process,especially for the 2.5%red brick modified sample,the reaction effect was optimal at 950℃,and the CO2 yield reaches 87%.The kinetic analysis of the programmed heating experimental data revealed that the red brick powder could shorten the reaction time with CO and accelerate the reaction process,and based on the cyclic reaction experiments,the modified oxygen carrier exhibited a more stable carbon conversion rate.The improved reactivity and enhanced cyclic stability were mainly due to the higher specific surface area and pore structure of the oxygen carriers by the red brick powder.
iron ore concentratechemical looping combustionoxygen carriersconstruction solid wastekinetic analysis