Hauv kev tsim cov hlau, txij li cov roj xws li bituminous thee thiab coke muaj ntau cov sulfur, steel kuj tseem muaj cov sulfur ntau, uas yuav cuam tshuam rau cov hlau zoo. Yog li ntawd, nyob rau hauv steel ntau lawm, hlau yuav tsum tau desulfurized, thiab magnesium yog ib tug nquag siv steel desulfurizer. Magnesium muaj zog desulfurization muaj peev xwm thiab tuaj yeem tshem tawm cov sulfur ntawm cov hlau thiab txo cov sulfur cov ntsiab lus ntawm cov hlau.