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Magnesia refractories are described as basic, which means they

  • A.must only ever be used below red heat
  • B.resist attack by basic slags in a furnace
  • C.are alkaline in solution when they are wetted
  • D.have a rather low melting point in service

Answer: B

Basic and acid in refractory practice describe chemical compatibility with the slag rather than pH in water. A basic refractory resists a basic slag and would be attacked rapidly by an acid one, and silica behaves the other way about.

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