Abstract
Hyper-coal (HPC) Process produces ash free coal by thermal extraction and solvent de-ashing in the coal derived methylnaphthalene solvent. That process also produces insoluble coal, Residual coal (RC), in which ash is concentrated. HPC will be utilized for various usages such as coke additive, material for the electrode for aluminum smelting, electric double layer capacitors, feedstock for the catalytic gasification, and etc with understanding the superior characteristics. On the other hand, the characteristics of RC have not been understood enough yet. It is important to understand the characteristics of RC for realizing the commercialization of Hyper-coal Process. Concerning to it, behavior of low temperature oxidation of RC is examined in this study. High porosity characteristic of RC indicates higher risk of spontaneous combustion. It is needed to take preventive measures against spontaneous combustion, and to develop efficient utilize turning to advantage.
