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Iron oxide nanoparticles prepared by sinter ash of sintering machine and their gas-sensing performances |
YIN Ruo-ming1,2, FU Hai-tao1,2, YANG Xiao-hong2, AN Xi-zhong2 |
1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China; 2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract Sinter ash of sintering machine is considered as undesirable waste with high iron content during ironmaking processes, and how to deal with sinter ash is always a difficult point in metallurgical field. In this work, we demonstrated a method for preparing high value-added spherical iron oxide nanoparticles by sinter ash. Various iron oxide nanoparticles (e.g. pristine α-Fe2O3 and Fe3O4 nanoparticles, and Fe3O4/Fe2O3 nanocomposites) were successfully prepared by controlling the ratio of reducing agent to iron element via a solvothermal process. X-ray powder diffractometer (XRD), X-ray fluorescence spectrometer(XRF), ultraviolet spectrophotometer, field emission scanning electron microscopy(SEM) were used to characterize the materials. The results indicate that pure α-Fe2O3, Fe3O4 nanoparticles, or different Fe3O4/Fe2O3 ratio nanocomposites can be gotten by controlling the amount of reducing agent. The sizes of these nanoparticles are uniform and they all have high purity (α-Fe2O3, 92.74%; Fe3O4, 94.44%), and they are easily prepared and have high repeatability. The gas sensing performance of prepared iron oxide nanoparticles was tested by gas sensor tester. The nano scaled products showed excellent gas sensing performance, especially towards 1-butanol had high sensitivity and unique selectivity. It is found that the optimal working temperature of Fe3O4/Fe2O3 nanocomposites (100 ℃) is lower than those of α-Fe2O3 and Fe3O4 nanoparticles by 160 and 100 ℃, respectively. Among the composites, 56/44 Fe3O4/Fe2O3 nanocomposite shows the highest sensing response (6.33) towards 1-butanol. The preparation of high-added value iron oxide nanoparticles with sintering machine of sinter ash realized the rational utilization of sintering machine ash resource, which has important theoretical and practical significance, and it provides a reference example for treatment of high iron-bearing solid waste in the steel and ironmaking process.
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Received: 10 September 2021
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