2174.     MAREK, L. F., BOGROW, A., AND KING, G. W.  Experimental Laboratory Study on Effect of Pressure on Carbon Deposition and Rate of Reduction of Iron Oxides in the Blast-Furnace Process.  Am. Inst. Min. and Met. Eng., Metals Technol., vol. 14, No. 4, Tech. Pub. 2184, 1947, 24 pp.; Chem. Abs., vol. 41, 1947, p. 4745.

        Commercial hematite was sized to 8-14 mesh and reduced with mixtures of commercial compressed CO, CO₂, and N₂, simulating gas compositions occurring in various zones of an actual blast furnace.  The results showed that the reduction of Fe₂O₃ proceeds by 2 steps:  To FeO and reduction of FeO to Fe.  Pressures of approximately 5 atm. abs. increased C deposition under the conditions used.  A maximum of C deposition occurred at about 489° at 5 atm. pressure and 1 hr. exposure.  The maximum deposition at the peak was more than 3 times the deposition at temperatures 50° higher or lower.  The rate of ore reduction is proportional to the linear velocity at constant pressure or to the pressure at constant linear velocity.

        MARELLI, S.  See abs. 8.

        MARK, H.  See abs. 355.