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Formation mechanism of the graphite-rich protective layer in blast furnace hearths

International Journal of Minerals,Metallurgy and Materials 2016年第1期23卷 16-24页

作者： Ke-xin Jiao Jian-liang Zhang Zheng-jian Liu Feng Liu Li-sheng Liang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China Baoshan Iron & Steel Co. Ltd. Shanghai 200941 China

A long campaign life of blast furnaces is heavily linked to the existence of a protective layer in their hearths. In this work, we conducted dissection studies and investigated damage in blast furnace hearths to estimate the formation mechanism of the protective layer. The results illustrate that a significant amount of graphite phase was trapped within the hearth protective layer. Furthermore, on the basis of the thermodynamic and kinetic calculations of the graphite precipitation process, a precipitation potential index related to the formation of the graphite-rich protective layer was proposed to characterize the formation ability of this layer. We determined that, under normal operating conditions, the precipitation of graphite phase ~om hot metal was thermodynamically possible. Among elements that exist in hot metal, C, Si, and P favor graphite precipitation, whereas Mn and Cr inhibit this process. Moreover, at the same hot-face temperature, an increase of carbon concentration in hot metal can shorten the precipitation time. Finally, the results suggest that measures such as reducing the hot-face tem- perature and increasing the degree of carbon saturation in hot metal are critically important to improve the precipitation potential index.

关键词： blast furnaces hearths graphite protective layers formation mechanisms

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Formation mechanism of the protective layer in a blast furnace hearth

引用

International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1017-1024页

作者： Ke-xin Jiao Jian-liang Zhang Zheng-jian Liu Meng Xu Feng Liu School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Shougang Research Institute of Technology

A variety of techniques, such as chemical analysis, scanning electron microscopy-energy dispersive spectroscopy, and X-ray diffraction, were applied to characterize the adhesion protective layer formed below the blast furnace taphole level when a certain amount of titanium-bearing burden was used. Samples of the protective layer were extracted to identify the chemical composition, phase assemblage, andistribution. Furthermore, the formation mechanism of the protective layer was determined after clarifying the source of each componenFinally, a technical strategy was proposed for achieving a stable protective layer in the hearth. The results show that the protective layemainly exists in a bilayer form in the sidewall, namely, a titanium-bearing layer and a graphite layer. Both the layers contain the slag phaswhose major crystalline phase is magnesium melilite（Ca2Mg Si2O7） and the main source of the slag phase is coke ash. It is clearly determinethat solid particles such as graphite, Ti（C,N） and Mg Al2O4play an important role in the formation of the protective layer, and the key factofor promoting the formation of a stable protective layer is reasonable control of the evolution behavior of coke.

关键词： blast furnaces hearths protective layers electroch

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