固体 CaO 化合物で飽和した CaO-CaF_2-SiO_2 系スラグと炭素飽和溶鉄間のりんの分配平衡

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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-CaF_2-SiO_2 melts saturated with CaO, 3CaO・SiO_2 and/or 2CaO・SiO_2 and carbon-saturated iron was measured under CO atmosphere at temperatures ranging from 1200 to 1400℃, 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・SiO_2. (2) Phosphate capacity was confirmed to be independent of the oxygen partial pressure by using iron-carbon melts equilibrated with austenite and CO at 1300℃. The phosphate capacity in basic regions of this system is much greater than other lime bearing slags. (3) CaF_2 is more effective for dephosphorization than CaCl_2, 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 Na_2O addition to the CaO-CaF_2-SiO_2 system. This result indicates that the costly soda ash treatment can be replaced by using lime based fluxes containing a little soda ash.
社団法人日本鉄鋼協会の論文
1985-04-01

固体 CaO 化合物で飽和した CaO-CaF_2-SiO_2 系スラグと炭素飽和溶鉄間のりんの分配平衡

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