Abstract
The mechanism of coke degradation by solution-loss reaction in the blast furnace was experimentally studied, and a resistance index for coke degradation under blast furnace conditions was established. The effects of coke texture and structure on coke degradation were also studied in order to allow the use of larger amounts of high-volatile non-coking coal.
When the concentration of CO2 gas diffusing into lump coke was decreased, the degradation of the entire lump of coke was limited and coke wear decreased. This would be realized if coke with high reactivity and low porosity could be produced, as far as the pore walls had the permissible strength. This suggests that high-volatile non-coking coal with a highly reactive coke structure can be used.
We also showed that the degradation resistance index under blast furnace conditions could be increased by controlling the dispersion of the texture derived from the non-coking coal, considering its preferential reaction. Thus, we obtained a guide for coke production with non-coking coal.
