... (2700 kcal or so), spontaneous combustion etc. characteristics, resulting in lower selling prices, sales radius is limited, so more and ... governments and research institutions attention.The Songling Tengda product of lignite dryer ,is also used for drying coal slurry, on the condition ... lower than 13%.The first drying area in the high humidity status ,remove most of moisture through 400 °C, to make ...