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Chen S.,University of Science and Technology Beijing | Chen S.,Fuzhou University | Huang B.,Sanming Iron and Steel Co | Zhu R.,University of Science and Technology Beijing | And 2 more authors.
Proceedings - International Conference on Computer Distributed Control and Intelligent Environmental Monitoring, CDCIEM 2011 | Year: 2011

The present paper discusses the technical characteristics of the converter duplex melting process (MURC), develop one special converter duplex melting process with low hot metal ratio to meet the actual producing condition of Fujian Sangang steel group. Research show, how to promote the melting of lime during dephosphorizing period is the key step for MURC process. Adjusting the charging amount of lime according to the w([Si]) content in hot metal is helpful to control the melting of lime and the slag basicity. Under the condition of low hot metal ratio, in dephosphorizing period, must raise the melting temperature referring to the conventional process, lower the target slag basicity and w(T.Fe) suitably. According to results of the special MURC process industrial experiments, this process can meet the requirements on the producing of high-performance steel. Average tapping w([C]) is 0.183%, w([P]) is 0.0183%. The average dephosphorization rate is more than 90%. At the same time, referring to the conventional process, the special MURC process save the consumption of steel material about 2.3kg/t and save the consumption of lime 11.2kg/t averagely. © 2011 IEEE. Source

Zhong L.-C.,Northeastern University China | Wang M.-A.,Northeastern University China | Chen B.-Y.,Sanming Iron and Steel Co | Wang C.-R.,Sanming Iron and Steel Co | Zhu Y.-X.,Northeastern University China
Journal of Iron and Steel Research International | Year: 2010

A1:2.5 scale tundish model was set up in laboratory (or a six-strand billet continuous casting tundish with different configurations to investigate fluid flow characteristics under different operational conditions by measuring residence time distribution curves. It was found that minimum residence time, maximum concentration time and average residence time of the three strands on the same side of the tundish with the former configuration under normal operation, that is, six strands were open, were small and non-uniform and the tundish had large dead volume fraction. Vortexes easily formed on the liquid surface in the pouring zone of the tundish. The fluid flow characteristics in the tundish with the optimal turbulence inhibitor and baffles were improved and became less non-uniform among the strands. Vortexes were not found on the pouring zone surface in the optimal tundish. For non-normal operation, that is, one strand was close, it was important to choose which strand to be closed for maintaining flow characteristics of the rest two strands. It was found from this investigation that fluid flow characteristics in the optimal configuration tundish with closing strand 2 were better than those with closing strand 3 on the same side. © 2010 Central Iron and Steel Research Institute. Source

Zhong L.-C.,Northeastern University China | Li H.,Northeastern University China | Wei S.,Northeastern University China | Chen B.-Y.,Sanming Iron and Steel Co | Wang C.-R.,Sanming Iron and Steel Co
Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 | Year: 2014

A kinetic model of desulfurization with magnesium injection from hot metal was built and the unknown kinetic parameters in this model, that is, volumetric mass transfer coefficients of sulphur and magnesium, Vs and FMg, and magnesium dissolution mass fraction, RMg, were determined by a try and error method with industrial data in a steelmaking plant. Then the model was applied in the industrial hot metal desulfurization process and influence of temperature and composition of hot metal on desulfurization results was investigated. It was found that the kinetic parameters, Vs, VMs and RMG, obtained in present work are 0.233 m3/s, 0.513 m3/s and 0.865, respectively, in this research. At initial phase of Mg injection, sulphur content varies slightly with time due to low Mg content in hot metal. With the increase in magnesium content in hot metal due to the magnesium injection the rate of desulfurization becomes high and almost constant. After the magnesium injection, the rate of desulfurization slows down soon and the magnesium and sulphur contents in hot metal decrease gradually. Magnesium amount needed for the desulfurization in most heats from the numerical calculation with this kinetic model is in good agreement with that from the industrial practice. At temperature range lower than 1300°C magnesium amount for desulfurization increases at lower rate, but it rises at higher rate in the temperature range higher than 1300°C. Magnesium utilization ratio for desulfurization of hot metal can be improved at lower temperature range, such as 1250∼1300°C, and higher initial sulfur content, e.g. 0.035∼0.06%. Copyright © 2014 MS&T14®. Source

Li J.,Control Iron and Steel Research Institute, China | Huang B.-C.,Sanming Iron and Steel Co | Fang Y.-R.,Sanming Iron and Steel Co | Chen B.-Y.,Sanming Iron and Steel Co | And 2 more authors.
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

The present paper introduces the practice of improving the end point target-hitting by adoption of hot metal dephosphorizing pretreatment and direct steel-making process in 100t converter. Cold smelting charge ratio was respectively 20%, 25%, 28%, by optimizing slag making and oxygen blowing process of dephosphorizing pretreatment period and decarburizing period, oxygen consumption rate increased from 20%-30% to 30%-50% than conventional process in dephosphorizing pretreatment period and slag charge was controlled at 8-15kg/t in decarburizing pretreatment period. Fifty heats industrial test results indicated that temperature controlling at first slag off achieve the level of conventional smelting process, the controlling levels of [C] and [P] were significantly better than conventional smelting process. Source

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