溶鉄中燐・炭素・酸素間の化学平衡について : 脱燐反応に関する研究 I

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Equilibrium of phosphorus-carbon-oxygen in liquid iron in contact with a mixture of solid calcium phosphate and calcium oxide was studied in a controlled gas atomosphere of CO-CO_2 gas mixture in the range of 0.03∿1.2% of phosphorus in liquid iron at 1530℃, 1560℃, and 1585℃. It was found that the stable phase of calcium phosphate was of tetracalcium phosphate, 4CaO・P_2O_5, at the presence of free lime in this experiments. The results obtained were summerized as follows : 2P__-+5CO_2+4CaO(S)=5CO+Ca_4P_2O_9(S)……(1) log K_1(=P^5_<CO>/P^5_<CO>・α^2_P)=32, 070/T-7.960……(1b) ⊿F^0_1=-146, 700+36.42T……(1c) 2P__-+5CO+4CaO(S)=5C__-+C_4P_2O_9(S)……(2) log K_2(=α^5_C/α^2_P・P^5_<CO>)=69, 860/T-41.79……(2b) ⊿F^0_2=-319, 600+191.2T……(2c) 2P__-+5O+4CaO(S)=Ca_4P_2O_9(S)……(3) log K_3(=1/α^2_P・α^5_O)=75, 660/T-31.77……(3b) ⊿F^0_3=-346, 100+145.3T……(3c)
社団法人日本鉄鋼協会の論文
1963-04-01