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• n  the scum formed by oxidation at the surface of molten metals
• v  convert into slag

• Upper Silesia is still blighted by strip mines and slag heaps.
• Three days of rain mixed with a runoff of snow had dramatically raised the level of the lake dammed up behind the huge coal-slag heap at the head of Buffalo Creek.
• Mixing slag with concrete saves energy and makes the concrete stronger.

• scoria
• dross

News & Articles

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• SOARES: Penny wise and pound foolish
  Jack’s pipe belched smoke as he puffed like an overloaded Mack truck chugging up President Avenue. The old man was flustered and it showed. He was melting lead for sinkers over an open oak fire, and when he began to pour, a piece of slag popped and scorched his hairy wrist.
  June 9, 2013 - Fall River Herald News
• NL Industries files lawsuit about local slag site naming Old Bridge as a defendant, among others
  OLD BRIDGE — To counter the Environmental Protection Agency announcement last Friday that named NL Industries as the sole polluter responsible for cleanup of the Raritan Bay slag site, the Texas-based corporation filed suit in federal court Wednesday through its attorney Christopher R. Gibson of Archer & Griener P.C. of Haddonfield.
  June 5, 2013 - MyCentralJersey.com