Iji anyị technology na ndepụta ma nri ọrụ. Ọtụtụ mgbe ụfọdụ, mgbe ị na-eche nke electrostatic beneficiation usoro, ihe ndị na-abata n'uche gụnyere ngwaahịa mmepụta ihe dịka

Na-ọzọ si gị ada uyi n'efu stream. Dabere na-eme kwa afọ nnyocha e mere site na American Kol Ash Association (ACAA) n'etiti 1966 na 2011, karịrị 2.3 ijeri mkpụmkpụ