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Slag scories ,crasses ,stériles 

Definition & Synonyms

• Slag

  1. (n.) A product of smelting, containing, mostly as silicates, the substances not sought to be produced as matte or metal, and having a lower specific gravity than the latter; -- called also, esp. in iron smelting, cinder. The slag of iron blast furnaces is essentially silicate of calcium, magnesium, and aluminium; that of lead and copper smelting furnaces contains iron.
  2. (v. i. & t.) To form, or form into, a slag; to agglomerate when heated below the fusion point.
  3. () Same as Basic slag, above.
  4. (v. t.) The dross, or recrement, of a metal; also, vitrified cinders.
  5. (v. t.) The scoria of a volcano.

Dross, Scoria,