In the present work, iron recovery from a low grade hematite ore (containing less than 40% iron), which is not usable in common methods of iron making, was studied. Non-coking coal was used as reducing agent. Reduction experiments were performed under various coal to hematite ratios and temperatures. Reduction degree was calculated using gravimetric method. Reduced samples were subjected to magnetic separation followed by X-ray diffraction analysis. The total iron content, degree of metallization and recovery efficiency in magnetic separated part were determined by quantitative chemical analysis, which under optimum condition were obtained about 82%, 95% and 64% respectively. The microstructures of reduced sample and final product were analyzed by scanning electron microscope. The results demonstrate that final metallic product can be used in steel making furnaces and charging of blast furnaces which can improves production efficiency and decreases coke usage.
کلید واژگان :
Low grade iron ore; Coal-based direct reduction; Sponge iron; Magnetic separatio
