Presence of MgO in alumino-silicate refractories _______________ its refractoriness?
Correct answer: B. Lowers
- A. Increases
- B. Lowers
- C. Does not affect
- D. Either A. or B.; depends on its quantity
Explanation
MgO acts as a basic flux in alumino-silicate refractories and can form lower-melting compounds with silica and alumina. This reduces the softening or fusion temperature, so refractoriness falls.
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