Ash-free coal production method using preciptitation by solubility change

摘要

#$%^&*AU2014324175A120151029.pdf#####ABSTRACT An ash-free coal production method using PRECIPITATION BY solubility change, the method comprising steps of: mixing a raw coal and an extraction solvent to prepare a slurry; heating the slurry to dissolve an organic component of the raw coal into the extraction solvent; separating a extracted solution in which the organic component is dissolved and an undissolved inorganic component from the heated slurry; adding a precipitation solvent to the extracted solution to precipitate solid ash-free coal; and separating the precipitated solid ash-free coal by solid-liquid separation.