| Abstract Scope |
The effects of reaction temperature and time on the reaction behavior of coke gasification were investigated, as well as the coke weight loss rate and pulverization rate under various conditions. The crystallite structure parameters of coke powder and residual coke block were calculated by XRD. The chemical composition, mineral phase transformation and microstructure of carbon bearing powder from different sampling positions, including raw coke, tuyere and blast furnace deadman, were characterized. The "mullitization" of melting inorganic minerals in coke was discovered after the high temperature gasification reaction that might cause coke to crack and pulverize. In the tuyere raceway, the coke powder and alkaline slag particles combined to aggregate. The coke powder and metal iron particles interacted to form a carbon-iron-slag symbiotic charge in the deadman. As the charge descent, the particle size of the carbon bearing powder gradually decreased, influencing the permeability and liquid permeability of the blast furnace. |