Application of Alumina-magnesia Precast Blocks for LF Refining Ladle
The alumina-magnesia precast blocks developed in authors company have been successfully used in 90-ton LF refining with an average service life 80-85 heats to meet the smelting demand of low carbon steel and ultra low carbon steel.The observation of the residual blocks revealed that the section of the used blocks was divided into four layers from inside to the surface,i.e.,slag layer,reaction layer,penetration layer and the original block.It has been found that there was a certain degree of structure spalling of the used blocks.The main factor of blocks damage may be due to the penetration and erosion of molten slag.The results of SEM microstructure analysis indicated that the calcium oxide(CaO) of high basicity slag easily penetrated into the blocks and formed CA6 phase,and then transformed into CA2 or C12A7 phases gradually with the decreasing content of alumina (Al2O3).It has been found that an annular distribution structure,and the silicon dioxide (SiO2) was easily lost together with slag and formed SiO2-rich part in the penetration layer due to the formation of low viscosity and low melting point phase of C2AS.A large number of -5um spinel particles (MgAl2O4) were synthesized at 1600~ 1700℃,which could absorb FeO,MnO and other impurities in slag to form composite spinel phase.It is believed that the high melting point phases intertwined to form a dense area which was beneficial to improve the bricks slag resistances to penetration and corrosion.
Alumina-magnesia Precast block LF refining, Penetration
Haixia Feng Jun Liu Yi Wei
Sinosteel Corporation Luoyang Institute of Refractories Research Co., Ltd,State Key Laboratory of Advanced Refractories, Luoyang 471039, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
594-598
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）