Research of Iron Slag Appearance of Blast Furnace Hearth

摘要

The reduction of ore and the separation of iron and slag were important points for blast furnace researchers. Some samples were obtained at tuyere and tap-hole when disassembling blast furnace to study the micro-mechanism of reduction and separation of iron and slag. The mechanism of coal-containing iron ore's reduction in laboratory was also studied as a compare. The results, concluded from metallurgical thermodynamics, dynamics and SEM analysis, indicate that: blast furnace is a long process reactor, and the reduction of iron ore in laboratory is different from which in blast furnace. In the lower part of blast furnace, the main process of the separation of slag and iron can be observed clearly in microstructure. The separation of iron and slag happened and the metal was assembled into dense sphere again due to the high temperature at tuyere. However, at the zone below tuyere, little iron balls which hadn't pass high temperature region was still iron and slag mixture, which was round. The separation of slag and iron was significant at tap-hole, but iron ball still kept the framework of ore pellet, and slag flew out from the crack of ore.