炭素飽和溶鉄と Na_2O-SiO_2 融体間のりん, マンガンの分配平衡および Na_2O-SiO_2 融体の窒素溶解度

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The phosphorus and manganese distribution between Na_2O-SiO_2 melts and carbon-saturated iron and the solubility of nitrogen in these melts were measured at hot metal temperatures by chemical equilibration. Phosphorus distribution increases and manganese distribution decreases with increasing Na_2O content in the slag. The Na_2O-SiO_2-PO_<2.5> system was found to have very large phosphate capacities ranging from 10^<26.7> to 10^<29> at 1200℃. The activity coefficient of FeO in the Na_2O-SiO_2 system ranged from 0.2 to 1.0. The partial pressure of oxygen at the slag-metal interface was estimated to be 10^<-17.2> atm at 1200℃ from the equilibration test of soda-slag used in the commercial hot metal treatment. Temperature dependences of phosphorus and manganese distribution are expressed as follows : log (%P)/[%P]=20200/T-10.9, log (%Mn)/[%Mn]=6070/T-2.74. Nitrogen was found to dissolve into Na_2O-SiO_2 melts as CN^- from the dependence of solubility on the nitrogen partial pressure when graphite coexists, as expressed by the following reaction : 1/2N_2+3/2C+1/2O^<2->=CN^-+1/2CO. The solubility of nitrogen increased with raising temperature and the Na_2O content in melts.
1985-05-01