TRANSFORMATION REACTION OF SIO2 IN COKE ASH UNDER OPERATING-CONDITIONS IN BLAST-FURNACE

In order to clarify the mechanism of the transformation reaction of SiO//2 in coke ash under operating conditions in blast furnace, fundamental experiments were performed with single coke particle as sample under gas flowing condition by the use of a pressurized high frequency furnace. Based on the experimental results, an unsteady state mathematical simulation model with consideration of the radial distribution was developed and applied to the quantitative evaluation of the transformation reaction of SiO//2 in coke ash. Reaction rate constants for both SiO gas generation reaction (k//1) and SiC formation reaction (k//2) were obtained in the temperature range of 1350-1650 degree C. The influences of total pressure, CO gas partial pressure and coke size on the transformation reaction can be quantitatively evaluated by the use of the simulation model.