Eiji IshiharaMasafumi Nishimura
19页查看更多>>摘要：It is prospected that, in accordance with the progress of environmental and ecological activities connected with achieving carbon neutralization by 2050, the ratio of steel production by electric arc furnace (EAF), which is characterized by a smaller amount of CO2 emission, will increase in the steel industry. Consequentially, production of high-grade steel products would increase in EAF steel mill, resulting in intensification of secondary refining treatments in the teeming ladle to guarantee steel qualities. Since teeming ladle refractories are severely damaged by intensive secondary refining, Al_2O_3-MgO-C brick is usually applied. As an alternative teeming ladle refractory, Al_2O_3-MgO refractory with superior corrosion resistance are introduced in this article as carbon free refractory for steel bath in teeming ladle in which intensive secondary refining is conducted. In practice, according to teeming ladle operational conditions, ALTIMA unburnt Al_2O_3-MgO brick, Al_2O_3-MgO castable refractories and precast block fabricated with Al_2O_3-MgO monolithic refractory can be used in combination. By applying carbon free refractories with low thermal conductivity for the steel bath in the teeming ladle, suppression of heat radiation from the teeming ladle steel shell results in the reduction of CO2 gas emission in EAF operation is expected along with prevention of molten steel contamination by the C component contained in refractories. In the case where a teeming ladle is relined with castable refractories, reduction of teeming ladle refractory unit consumption is expected by adopting partial additional repair work along with reduction of waste disposal. Because of such advantageous characteristics, carbon free refractories are practically applied for teeming ladle in several steel mills.
原文链接:
NSTL
Koji AsakawaYuto SuzukiMasakazu Iida
14页查看更多>>摘要：It is anticipated that minimizing heat radiation from high temperature furnace bodies by utilizing refractory materials with low thermal conductivity, namely, heat insulation refractories will become more and more important because it effectively reduces consumed energy and CO2 gas emissions. Since, due to its poor physical strength, application of low thermal conductivity refractory materials is limited, the mechanical strength of such refractory materials needs to be improved for broader application. In this article, heat insulation castable refractory applicable for furnace or vessel relining, newly developed fiber blended castable refractories and heat insulation board with ultra-low thermal conductivity and smaller plastic deformation even in application use as back relining are introduced one by one. They are categorized as thermal insulation refractories with improved mechanical strength. Application of these materials in various fields is expectable.
原文链接:- NSTL
Hiroyasu NiitsumaTakayuki Matsunaga
13页查看更多>>摘要：One of the major issues with submerged entry nozzles (SEN) used in the continuous casting process is alumina clogging. Alumina clogging occurs through a complex process in which several chemical reactions and physical interactions take place simultaneously. In order to prevent alumina clogging, suitable SEN application in terms of material chemistry as well as geometric design is essential. In this article, features of our four material types and two shape designs, which suppress clogging suppression, and their application results are described.
原文链接:- NSTL
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