Study On Carbon Reduction Of Guizhou Oolitic Hematite By Graphite In Muffle Furnace

Oolitic hematite is an important iron ore resource in China. The mixed powder of the Guizhou oolitic hematite, the graphite, and the calcium hydroxide was pressed in a cylindrical sample mold by a 16 Mpa pressure. The dried samples at 378K for 12h were reduced in a muffle furnace at the temperature between 1323K and 1473K. The microstructure and the metallization degree of the sample were studied by means of optical microscope and chemical analysis. The results show that the higher metallization degree of the Hezhang oolitic hematite was up to 80.2% at 1323K with carbon oxgen mole ratio 1.3, the metallization degree of the sample in a muffle furnace is lower than that in a microwave furrnace, the lower metallization degree of the sample should be concerned with that the redued metallic iron can be oxidized in the muffle furnace with the temperature cooling down very slowly.