Improvement of Coking Property of Low-Grade Coals by Mild Reduction Treatment

With the recent concern over depletion of high-quality coking coal used for coke production, it is desirable to develop a simple method convert low-grade coals with poor properties into coals. In this study we have focused on possibility that polymerization reactions caused by recombination coal-inherent radicals may occur when heated, which can deteriorate softening and melting coal. Aiming at removing such radicals, proposed pretreatment improving property coals, in are treated reductant as formic acid around 60°C. It was shown treatment either aqueous or vapor significantly improved coals’ thermoplastic performance enhanced strength resulting even though consumption small enough hardly change elemental composition We also succeeded restoring weathered