PATENT

3786.  URQUHART, N. J., AND RIDER, C. A.  (Combustion Processes Co.)  Method of Reducing Iron Oxides.  United States Patent 2,654,669, Oct. 6, 1953; appl. filed Oct. 2, 1951;  Serial No. 249,323; 4 claims (Cl. 75-33).

Claim 1.  the method of reducing Fe oxide by supporting a particulate batch of Fe oxide and C in the chamber of a rotable tubular furnace, sustaining a reducing atmosphere over the said particulate batch, repeatedly raising substance of the batch at the surface thereof to a crust forming temperature below that at which free flowing slag is formed, and by successive intermittent angular movements of the said furnace chamber turning under in the particulate batch successive crusts of reduction products formed at the surface of the batch, while repeatedly bringing fresh substance of the batch to the surface thereof for exposure to the crust forming gases and temperature of the said furnace atmosphere.