Study on Reduction of Oolitic Hematite by Graphite in Microwave

Abstract

Oolitic hematite is widely distributed and counted about 10% of the total iron ore resources in China. The powders mixture of the oolitic hematite, the graphite, and the calcium hydroxide was extruded into the cylindrical pieces in the mold by a 10MPa pressure, and reduced in microwave at 1373K. The microstructure and the metallization rate of the sample were studied by optical microscope and chemical analysis. The result shows that the metallization rate increased either with the time extending from 2.0h to 3.5h, or with the C/O atomic ratio increasing from 1.0 to 1.3, or with the binary basicity increasing from 0.16 to 1.5, and the highest value was up to 94.7% on the condition that the atomic ratio C/O is 1.3, the basicity of the sample is 1.5, and the holding time is 3.5h.