Investigation of the Composition of Tuyere Coke by Analyzing the Surface Material Removed by Abrasion

摘要

The nature of the surface of the tuyere cokes was examined by subjecting them to size reduction in a flightless drum. The ash, iron and alkali contents of the degradation products were measured to estimate the degree of deposition of these materials between the surface and core of the coke particles. Ash and iron, as well as hydrogen and nitrogen, contents were greater at the surface than at the core. The carbon content increased as the ash content decreased. Alkalies were uniformly absorbed between the surface and the core of the coke. The apparent weakness of tuyere coke compared with its parent feed stock is suggested to be due to the low-carbon high-ash structure of the outer skin of the tuyere particles on each side of every fissure.