Coal is a complex sedimentary rock, which contains organic and inorganic matters. In general, the raw coal requires the
removal of ash-forming inorganic matters by beneficiation processes. Coal beneficiation has been world widely used for more
than a century and is typically classified as wet beneficiation processes and dry beneficiation processes [1]. Historically, wet
beneficiation processes were viewed to be more efficient than dry beneficiation processes. Wet beneficiation processes including