The impurities in a molten pool of iron Flux such as limestone may be added to foster the congregation of undesired elements into a slag Because slag is lighter than iron, it will float on top of the pool, where it can be skimmed
Waste material from the smelting process The black, lava-like material is primarily iron and silica
a hard, air-cooled aggregate that is left as residue from blast furnaces It is used as a surfacing aggregate and should be surface dry and free of sand, clay, or other foreign substances at the time of application
A silica-rich froth containing impurities produced in the smelting of gold and silver Development of slag is encouraged by the addition of especially formulated fluxes
The impurities in a molten pool of iron Flux may be added to congregate the impurities into a slag Slag is lighter than iron and will float allowing it to be skimmed