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Hou X.-M.,University of Science and Technology Beijing | Hou X.-M.,Key Laboratory of Ecological and Recycle Metallurgy | Yue C.-S.,University of Science and Technology Beijing | Zhang M.,University of Science and Technology Beijing | Chou K.-C.,University of Science and Technology Beijing
International Journal of Minerals, Metallurgy and Materials | Year: 2011

The oxidation behavior of different SiAlON phases (β-SiAlON, X-phase SiAlON and 12H powders) synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry (TG) and field-emission scanning electron microscopy (FE-SEM). The effect of ferric oxide impurities in coal gangue was studied. The results show that ferric oxide contributes to the growth of SiAlON crystalline during the synthesis process. In the oxidation experiment, the existence of ferric oxide decreases the oxidation resistance of SiAlON. The reason is that the impurity causes the formation of a liquid phase at a higher temperature. At 1423-1623 K, the oxidation of SiAlON powders is diffusion controlled and it can be described by Chou's model. A fair agreement is found between theoretical calculations and the experimental data. © 2011 University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg. Source


Li H.,University of Science and Technology Beijing | Li H.,Key Laboratory of Ecological and Recycle Metallurgy | Guo L.,University of Science and Technology Beijing | Li Y.,University of Science and Technology Beijing | And 8 more authors.
Advanced Materials Research | Year: 2011

Some industrial trials of utilizing limestone as a new kind of slag-making agent instead of lime for slagging during LD-steelmaking process are discussed and analyzed in the present work. The results indicate that with oxygen blowing time being unchanged, slag forming rate increased significantly and final steel compositions and temperature reached the required standard during the steelmaking process with limestone used, compared with the process by using lime. The preliminary success achieved from industrial tests gave strong evidence that the idea of using limestone instead of lime for slagging is feasible and this new steelmaking method with limestone used, which saves energy and reduces CO2 emissions, can be successfully applied into industrial production. Thus, the application of this new method can not only sharply reduce energy consumption and emission of dust and CO2, but also bring significant environmental and economic benefits. © (2011) Trans Tech Publications, Switzerland. Source


Guo L.,University of Science and Technology Beijing | Li H.,University of Science and Technology Beijing | Li H.,Key Laboratory of Ecological and Recycle Metallurgy | Li Z.,University of Science and Technology Beijing | And 3 more authors.
Advanced Materials Research | Year: 2011

Variations of decomposition rate and decomposition layer thickness of six spherical limestone particles with different sizes are calculated and compared with each other by the experiments and model of static decomposition of limestone under constant temperature. The results indicate that: the decomposition process of limestone can be explained by unreacted core model (UCM) when it is heated sharply; the decomposition rate of large particle is greater than that of small one; the smaller particle size, the larger decomposition layer thickness in unit time. © (2011) Trans Tech Publications, Switzerland. Source


Zhu J.,Key Laboratory of Ecological and Recycle Metallurgy | Zhu J.,University of Science and Technology Beijing | Xue J.,Key Laboratory of Ecological and Recycle Metallurgy | Xue J.,University of Science and Technology Beijing
TMS Annual Meeting | Year: 2011

Coal gangue is industrial waste containing Al 2O 3 and SiO 2 with great recycling and reuse values. This work is aimed at extracting Al 2O 3 content in the coal gangue by a process of carbonthermal reduction - alkaline leaching. The Al 2O 3 and SiO 2 contents first became a mixture of SiC and Al 2O 3 in the process of carbonthermal reduction, and then Al 2O 3 was separated by leaching in NaOH solution, thus producing the sodium aluminate solution for Al(OH) 3 precipitation. The products generated at various stages in the process were inspected using XRD and chemical analysis. The effects of parameters such as reduction temperature, carbon ratio, NaOH concentration, leaching time, leaching temperature, stirring speed, etc were investigated in details. Source


Hou X.-M.,University of Science and Technology Beijing | Hou X.-M.,Key Laboratory of Ecological and Recycle Metallurgy | Hu X.-J.,University of Science and Technology Beijing | Hu X.-J.,Key Laboratory of Ecological and Recycle Metallurgy | And 2 more authors.
Journal of the American Ceramic Society | Year: 2011

The oxidation behavior of titanium nitride powder at different oxidizing atmospheres was investigated using thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy. Oxidation experiments have been carried out both in isothermal as well as nonisothermal modes. The nonisothermal oxidation result showed that the oxidation rate was affected by temperature, heating rate, and oxygen partial pressure. The isothermal oxidation result showed that the diffusion of oxygen through the oxide product layer to the oxide/titanium nitride interface was the rate-controlling step and the oxidation product became obviously porous at elevated temperature. In view of the oxidation kinetics, Chou model, which quantitatively expresses the oxidation weight increment as a function of time, heating rate, temperature, and oxygen partial pressure, has been employed and gotten a good agreement. © 2010 The American Ceramic Society. Source

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