| 摘要 |
1527070 Hardening iron ore pellets UNION CARBIDE CORP 5 Aug 1977 [6 Aug 1976] 32852/77 Heading C1A In hardening green iron ore pellets in a gratekiln furnace, including a zone in which the pellets are preheated to 1100-2200‹ F. by a downward flow of hot gases, this zone is provided with at least two hoods at the peripheral areas of the grate passing through the zone, and at least one oxygencontaining stream is passed within each hooded area and downwardly through the periphery of the bed of the pellets, the residence time of the pellets in the zone being at least 5 seconds. |
