The Study of Thermal Decomposition of Solid Carbonaceous Reducing Agents
The article presents the research results in thermal decomposition of coal of different ranks: 2B - brown coal; D - long-flame coal; T - noncoking coal; SS - low-caking coal. Experiments to determine the volume and composition of gases generated by heating coal in an inert atmosphere are described. It is determined that the resulting gas phase is mainly composed of hydrogen and carbon monoxide. The temperature ranges are determined for the processes of thermal decomposition of coal. A thermal decomposition process includes two stages: stage I - removing hygroscopic and colloid-bound moisture; stage II - a sharp change in coal weight caused by the released volatiles and other coal-derived gases. The effect of coal thermal decomposition products on solid state reduction of iron from iron ore oxides is analyzed. It is proved that the gases generated by the thermal decomposition of coal are involved in solid-phase reduction of iron from oxides.