Ningxia zoo anthracite (tsuas yog cov tshauv tsawg, sulfur tsawg, phosphorus tsawg, carbon ruaj khov siab, calorific nqi siab) yog calcined ntawm 1200 ℃, nrog oxidation muaj zog, lub zog siab, tshuaj lom neeg ua haujlwm siab, siab huv thee rov qab tau thiab lwm yam ntxwv. Nws yog siv los ua kom cov pa roj carbon ntau ntxiv hauv kev ua hlau. Nws lub luag haujlwm yog kom nce qhov kub sai, nrog cov txiaj ntsig zoo thiab ruaj khov carbon nqus. Nws tuaj yeem siv los kho cov pa roj carbon thiab cov pa oxygen ntawm cov hlau molten, hloov nws cov rigidity thiab toughness, thiab yog li txhim kho lub peev xwm nucleation ntawm cov hlau molten thiab sab hauv zoo ntawm billet.
