Hlau thiab steel slag yuav muab faib ua blast furnace slag thiab steelmaking slag. Ntawm qhov tod tes, tus qub yog tsim los ntawm melting thiab txo cov hlau ore nyob rau hauv lub qhov cub tawg. Ntawm qhov tod tes, qhov kawg yog tsim thaum lub sij hawm steelmaking txheej txheem los ntawm kev hloov cov muaj pes tsawg leeg ntawm hlau.