Moving hot metal to a basic oxygen furnace to make steel.Seong Joon Cho/Worldsteel—Getty Images The basic process for making steel hasn’t changed a whole lot in the past few hundred years. Into the ...

Slags originate from different stages in the iron and steel process, for example, electric arc furnace, blast furnace, basic oxygen furnace, converter, or ladle. In the blast furnace, slag is ...