. Transactions. istance fromTop, Meters Temperature,Degrees C. Equilibrium Composition of Gas, Per Cent. CO in ( DO-COt in FesOj-FeOEquilibrium FeO-FeEquilibrium FeO-FejCEquilibrium Fe-FejCEquilibrium CEquilibrium 1100 1000 900 850 800 750 700 36 7 650 40 4 600 550 Each of the equilibrium curves may be plotted from this table on theblast-furnace diagram drawn by Schles
. Transactions. istance fromTop, Meters Temperature,Degrees C. Equilibrium Composition of Gas, Per Cent. CO in ( DO-COt in FesOj-FeOEquilibrium FeO-FeEquilibrium FeO-FejCEquilibrium Fe-FejCEquilibrium CEquilibrium 1100 1000 900 850 800 750 700 36 7 650 40 4 600 550 Each of the equilibrium curves may be plotted from this table on theblast-furnace diagram drawn by Schlesinger as shown in Fig. 18: A. MATSTIBARA 49 Curve I is an equilibrium curve of reaction Fe304 + C0^3FeO + COCurve II is an equilibrium curve of FeO + CO^Fe + CO2Curve III is an equilibrium curve of 3FeO + SCO^FesC + 4CO2Curve IV is an equilibrium curve of 3Fe + 2CO;^Fe3C + CO2Curve V is an equilibrium curve of 2C0^C + VI represents the actual gaseous composition measured bySchlesinger. Per Cent CO40 GO. Fig. 18. That part of curve VI corresponding to temperatures lower than 910°C. is quite similar to the FeO-Fe curve, showing that the main part of thereducing power of this blast furnace is used for the reduction of ferrousoxide. Ferrous oxide is difficult to reduce owing to its low dissociationpressure, while the reductions of ferric oxide and magnetic oxide areeasier because of their high dissociation; the removal of oxygen, cor-responding to about 24 per cent, of the original oxygen content willconvert the latter wholly into a mixture of ferrous oxide and iron. The form of the curve IV, however, must be affected by the followingfactors: (1) Evolution of CO2 from limestone; (2) reaction of soot de- VOL. LXVII.—4 50 CHEMICAL EQUILIBRIUM BETWEEN IRON, CARBON, AND OXYGEN position; (3) reduction of higher oxides; (4) carburization; (5) reducingaction of C upon CO2. For the dissociation pressure of CaCOs, J. Johnstone^ gave the follow-ing numbers: Temperatdre,Degrees C
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