Ningxia high quality-anthracite (musamman low ash, low sulfur, low phosphorus, high kafaffen carbon, high calorific darajar) an calcined a 1200 ℃, tare da karfi hadawan abu da iskar shaka juriya, high inji ƙarfi, high sinadaran aiki, high tsabta coal dawo kudi da sauran halaye. An fi amfani da shi don haɓaka carbon a aikin ƙarfe. Ayyukansa shine haɓaka yawan zafin jiki da sauri, tare da sakamako mai kyau da kwanciyar hankali na ɗaukar carbon. Ana iya amfani da shi don daidaita abubuwan da ke cikin carbon da abun da ke cikin iskar oxygen na narkakkar karfe, canza tsattsauran ra'ayi da taurinsa, don haka inganta ikon haɓakar ƙarfe na narkakkar da ingancin ciki na billet.
