475. CHAUDRON, G. [Reversible Reactions of Carbon Monoxide on the Oxides of Iron.] Compt. rend., vol. 172, 1921, pp. 152-155; Jour. Chem. Soc., 1921, II, p. 178.

475. CHAUDRON, G. [Reversible Reactions of Carbon Monoxide on the Oxides of Iron.] Compt. Rend., vol. 172, 1921, pp. 152-155; Jour. Chem. Soc., 1921, II, p. 178.

Starting with Fe₂O₃ and CO, the equilibrium is studied over a temperature range of 300°-1,000°. The Fe₂O₃ is reduced to the magnetic oxide, and beyond this stage 2 reactions may occur. Below 580° there is a single system corresponding with Fe₂O₄+4CO=4CO₂+3Fe. Above 580° there are 2 equilibria before arriving at Fe, namely, Fe₃O₄+CO=3FeO+CO₂ and FeO+CO=Fe+CO₂. The 3 solid phases coexist in equilibrium at 580°. Below 580°, FeO is unstable and is transformed into a mixture of Fe and the magnetic oxide, 4FeO=Fe₃O₄+Fe.