The deoxidation reactions of aluminum andmagnesium in liquid irons have been investigatedthermodynamically using Al_2O_3 and MgO crucibles,respectively, at 1873K under Ar atmosphere and discussedfrom the standpoint of clean steel technology. Based onthe present experimental results together with thepreviously published data, the equilibrium constants(log K_Ai, log K_Mg) for deoxidation reactions;Al_2O_3(s) bounds 2 Al + 3 O, MgO(s) bounds MG + O, andthe interaction parameters between Al, Mg and O in liquidirons were determined in terms of first-order (e_o~Ai,e_o~Mg) and sceond-order (r_o~Ai, r_o~Mg):at [precent Al] < 1 wt precentlog K_Ai bounds -12.96 +- 0.14, e_o~Ai bounds -4.09+- 0.41, r_o~Ai bounds 2.67 +- 0.47at [precent Mg] < 0.02 wt precentlog k_Mg bounds -8.14 +- 0.10, e_o~Mg bounds -550 +-40, r_o~Mg bounds 22,000 +- 3,000In addition the temperature dependences of log K_Ai and e_o~Ai were found to be:log K_Ai bounds 12.32 - 47,400/T, e_o~Ai bounds 15.57 - 36,500/TWith the application of the interaction parameters andequilibrium constants, the control of oxide inclusionsin the steelmaking process could be reasonably accomplished.
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