THE ATTACK OF THE DOLOMITE LINING OF OXYGEN-BLOWN STEELMAKING CONVERTERS BY HIGH P_2O_5-CONTAINING SLAGS
Yu Guo-cheng (Yü Kuo-cheng)
Cite this article:
Yu Guo-cheng (Yü Kuo-cheng). THE ATTACK OF THE DOLOMITE LINING OF OXYGEN-BLOWN STEELMAKING CONVERTERS BY HIGH P_2O_5-CONTAINING SLAGS. Acta Metall Sin, 1978, 14(3): 272-283.
Abstract The very severe attack of the dolomite lining of oxygen-blown steel-making converters by high P_2O_5 containing slags has been considered on phase relations. In steel-making practice, no difference was observed between slags of high and of low P_2O_5 content in their attack upon MgO in dolomite linings, but upon CaO in the same linings was more severe and the higher the P_2O_5 content of the slag, the greater the attack. Reasons for these are as follows:1. At 1600℃ the slag of high P_2O_5 content is a homogeneous liquid or a heterogeneous liquid of high reactivity with CaO, whereas the slag of low P_2O_5 content is a heterogeneous liquid of low reactivity with CaO.2. At 1600℃ the slag of high P_2O_5 content sometimes appears to be a twophase liquid, which attacks CaO severey, whereas the slag of low P_2O_5 content is always an one-phase liquid.3. with slags of high P_2O_5 content, the greater the amount of SiO_2 present, the higher will be its saturation for CaO, thus rendering the attack on CaO more severe. This is not the case, however, with slags of low P_2O_5 content.The above problem may be remedied by introducing more CaO in slag.
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