The study of the direct reduction of iron based on the lignite solid char

Abstract

In this paper, the direct reduction of iron ore (DRI) with the lignite solid char in vertical furnace were investigated on different conditions, such as reduction temperature, residence time, ratio of solid char to iron ore. It is found that, at the range of 800~950°C, the degree of total iron (Fe%) and metallization (M%) increased with the temperature increasing, relatively, when the temperature rise up to 1100°C, Fe% was almost consistent, while M% decreased obviously. Fe% and M% increased with the residence time ranging from 0.25h to 1.5h, when it came up to 2h, both Fe% and M% varied merely. The influence of char consumption ratio on Fe% and M% had the same tendency with the residence time. When the ore size increased from 1~2mm to 5~6mm, Fe% was little change, and M% decreased with ore size increased. Finally, with grinding magnetic of the direct reduction, Fe% increased more than 5%.