溶融転炉スラグからの遊離石灰と遊離マグネシヤの生成挙動

概要

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Experiments have been made to study the crystallization process of free lime and magnesia from the molten LD-converter slag saturated with magnesia. Many types of free lime exist depending on the cooling conditions and the slag basicity. In rapidly cooled slags with a basicity higher than 4, two types of free lime exist, i.e. primary lime solid solution (L_<pri>) and lime solid solution (L_<per>) as residuum which results from a peritectoid reaction between L_<pri> and the liquid slag. On the other hand, in slowly cooled slag, three types of free lime exist. 1) CaO rich phase (L_<wus>) which contains a lot of minute precipitates of white spots of wustite. 2) Lime (L_<C_3S>) as a mixture of 2CaO・SiO_2 and lime solid solution which are formed by the decomposition of 3CaO・SiO_2. 3) Lime (L_<res>) which exists in the form of a string along boundaries of 2CaO・Fe_2O_3 crystals. Free magnesia forms a solid solution with FeO or/and MnO in slag and changes into magnesio wustite (MW). The mechanism of the formation of such various phases is discussed.
社団法人日本鉄鋼協会の論文
1983-01-01