298. CALDWELL, M. L. Gaseous Reduction of Iron Oxide in Suspension. United States Patent 2,399,984, May 7, 1946. Chem. Abs., vol. 40, 1946, p. 4340.

Patent Abstracts

Finely divided Fe₂O₃ or Fe₂O₄ is brought into contact with vertically moving H₂, Co, hydrocarbon gas, or natural gas at 1,300º-1,700º F. in vertical tubes to provide more intimate contact between oxide and gas than is possible in horizontal equipment. Magnetic separation removes Fe from oxide.