PRODUCTION OF SPONGE IRON BY TUNNEL KILN

Abstract

Continuous experiment was performed on a industrial scale for the production of sponge iron by using tunnel kiln furnace. Crushed ores were classified into fwo parts of which one consists of the size 10-40min, and another of the size under 10mm. The latter were crushed again up to all under 30mesh. Ores of the size 10-40mm were mixed with fine coke and put in chamotte containers. Fine are was mixed with Boilable amount of carburising medium. The mixture was put in a phamotte container in such way as not to mix with the reducing coke. These containers were placed on a car, which ran through the kiln. The max. temp of the kiln was kept at about 1300°C. The seduced products were solid mass of sp. gr. about B.G. The sp. gr. of 7 may be obtained, if desired, by suitably charging conditions. According to this experiment it was shown that the sponge iron might be easily produced by tunnel kiln.