Ningxia elu-edu anthracite (pụrụiche ala ash, ala sọlfọ, ala phosphorus, elu ofu carbon, elu calorific uru) na-calcined na 1200 ℃, na ike ọxịdashọn eguzogide, elu n'ibu ike, elu chemical ọrụ, elu dị ọcha coal mgbake ọnụego na ndị ọzọ e ji mara. A na-ejikarị amụba carbon n'ime ígwè. Ọrụ ya bụ ịkwalite okpomọkụ ngwa ngwa, na-enwe mmetụta dị mma yana ọnụego nnabata carbon kwụsiri ike. Enwere ike iji ya dozie ọdịnaya carbon na ikuku oxygen nke nchara a wụrụ awụ, gbanwee isi ike ya na ike ya, wee si otú a kwalite ikike nucleation nke ígwè gbazere na àgwà nke billet dị n'ime.
