固体CaO化合物で飽和したCaO-CaF2-SiO2系スラグと炭素飽和溶鉄間のりんの分配平衡

村木 峰男, 福島 裕法, 佐野 信雄

doi:10.2355/tetsutohagane1955.71.6_693

The information of thermodynamic properties of phosphorus in lime bearing slags at low temperatures is required in connection with the recent progress of hot metal treatment. In the present study, the equilibrium distribution ratio of phosphorus (L_P) between CaO-CaF₂-SiO₂ melts saturated with CaO, 3CaO·SiO₂ and/or 2CaO·SiO₂ and carbon-saturated iron was measured under CO atmosphere at temperatures ranging from 1 200 to 1 400°C, keeping in mind that the industrial flux always contains some undissolved solids. The results are summerized as follows : (1) L_P increases with increasing CaO content and has a maximum when the slag is saturated simultaneously with CaO and 3CaO·SiO₂. (2) Phosphate capacity was confirmed to be independent of the oxygen partial pressure by using ironcarbon melts equilibrated with austenite and CO at 1 300°C. The phosphate capacity in basic regions of this system is much greater than other lime bearing slags. (3) CaF₂ is more effective for dephosphorization than CaCl₂, probably because the interactions between fluorine and phosphorus and between fluorine and calcium are stronger than those between chlorine and phosphorus and between chlorine and calcium, respectively. (4) L_P increases significantly with a small Na₂O addition to the CaO-CaF₂-SiO₂ system. This result indicates that the costly soda ash treatment can be replaced by using lime based fluxes containing a little soda ash.

固体CaO化合物で飽和したCaO-CaF<SUB>2</SUB>-SiO<SUB>2</SUB>系スラグと炭素飽和溶鉄間のりんの分配平衡

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