Anthracite mai inganci na Ningxia (ƙaramin toka, ƙarancin sulfur, ƙarancin phosphorus, babban carbon mai tsayayye, ƙimar calorific mai yawa) ana yin calcined a zafin 1200 ℃, tare da juriyar iskar shaka, ƙarfin injina mai yawa, yawan sinadarai mai tsabta, yawan dawo da kwal mai tsabta da sauran halaye. Ana amfani da shi galibi don ƙara yawan carbon a cikin yin ƙarfe. Aikinsa shine ƙara yawan zafin jiki da sauri, tare da kyakkyawan tasiri da kuma daidaitaccen ƙimar sha na carbon. Ana iya amfani da shi don daidaita yawan carbon da iskar oxygen na ƙarfe mai narkewa, canza tauri da tauri, don haka inganta ƙarfin nucleation na ƙarfe mai narkewa da ingancin billet na ciki.
