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oxygen transfer phenomenon between slag and molten steel for production of IF steel

Journal of Iron and Steel Research(International) 2020年第4期27卷 402-408页

作者： Yun-qing Ji Chun-yang Liu Hui-xiang Yu Xiao-xuan Deng Fu-xiang Huang Xin-hua Wang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Steelmaking Plant Beijing Shougang Co.Ltd.Qian’an 100041HebeiChina Research Institute of Technology Shougang Group Co.Ltd.Beijing 100043China

FeO-containing slag originated from the basic oxygen furnace to the ladle is a major reoxidation source during the following secondary refining.Ladle slag reduction treatment(slag treatment)is one of the common countermeasures adopted to eliminate the steel contamination by FeO reoxidation.The oxygen transfer phenomenon between molten steel and slag was studied during the industrial production of interstitial-free(IF)steel,the measured and calculated oxygen activities in steel were compared,and the Fe–O equilibrium at the slag–molten steel interface was investigated by thermodynamic analysis.With slag treatment,the oxygen potential is higher in the molten steel than in the pre-deoxidation slag;this causes oxygen transfer from the molten steel to the slag,decreasing the efficiency of slag treatment.Based on this,a two-step slag deoxidation process was optimized.The second step further reduced the FeO content.On the other hand,the CaO/Al2O3(C/A)ratio in the refining slag must be controlled,because it affects the FeO activity and inclusion absorption capacity of the slag.The results suggest that the C/A ratio of 1.2–1.5 and the FeO content of\6%are beneficial to refine IF steel.

关键词： oxygen transfer IF steel Deoxidation Slag treatment Refining slag

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Hydrodynamics and oxygen transfer in a novel extra-loop fluidized bed bioreactor

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Journal of Shanghai University(English Edition) 2010年第4期14卷 266-274页

作者：陆永生 DAGOT Christophe BAUDU Michel LAURENT Julien 胡龙兴 School of Environmental and Chemical Engineering Shanghai University Université de Limoges Groupement de Recherche Eau Sol Environnement16 Rue AtlantisF-87068 Limoges CedexFrance

In this paper, the characteristics of fluid mixing time in a novel extra-loop fluidized bed were studied. The results showed that the mixing time was shortened with the increase of fluid velocity. All the discrete numbers of the reactor were above 0.2. The serial number n was 2.5 -3.0. It was judged accordingly that the reactor fluid state was continous stirred tank reactor （CSTR） mainly. When the inspiratory capacity increased the mixing time of the reactor was shortened. Thus the air input was beneficial for the fluid mixing. During the three phases mixing process, the mixing time of the reactor could be decreased by the n increase of carrier and air loading together, but the change was not significant. The parameters affecting the reactor fluid state were fluid velocity, inspiratory capacity and carrier. KLa could be increased with the air loading increase, and at the same gas/liquid ratio when the pressure drop was high, KL~ value was increased. The amount of carrier complex influence on KLa. As the carrier loading continued to increase, its value had been dropped but the changes was not significant, and optimization condition was found at above 800 1 000 g carrier loading （pouzzolane） or 600 g PVC. Under gas/liquid ratio of 0.8% -5.2%, KLa was （0.62-1.37）×10^-2· s^-1.

关键词： extra-loop fluidized bed mixing time oxygen transfer fluid velocity Venturi aero-ejector carrier

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Synergetic effect of TeMo_5O_(16) and MoO_3 phases in MoTeO_x catalysts used for the partial oxidation of propylene

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Journal of Natural Gas Chemistry 2011年第3期20卷 249-255页

作者： Yiming He Ying Wu Weizheng Weng Huilin Wan Department of Materials Physics Zhejiang Normal University Jinhua 321004 Zhejiang China State Key Laboratory for Physical Chemistry of the Solid Surfaces Xiamen University Xiamen 361005 Fujian China Institute of Physical Chemistry Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces Zhejiang Normal University Jinhua 321004 Zhejiang China

Abstract A detailed study on the synergetic effect of TeMo 5 O 16 and MoO 3 phases in the MoTeO x catalysts for the partial oxidation of propylene to acrolein has been reported in this work. It was found that both propylene conversion and acrolein selectivity increased with the addition of MoO 3 to TeMo 5 O 16 . Based on the results of N 2 adsorption-desorption, XRD, XPS, in-situ XRD, O 2 -TPO, and 2-propanol decomposition reaction, the higher catalytic performance and synergetic effect could be attributed to the enhancement of acidity and the oxygen transfer from TeMo 5 O 16 to MoO 3 phase.

关键词： synergy TeMO5O16 MoO3 acidity oxygen transfer

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