Discussion
Match the refractory with its class.
1. Magnesite 2. Silica 3. Chromite
P. Acidic Q. Neutral R. Basic
Answer: B
Correct answer: 1-R, 2-P, 3-Q
The classification follows the chemistry. Magnesite is magnesia-rich and therefore basic. Silica is acidic. Chromite is neutral, which is why it is used as a buffer layer between an acidic and a basic lining where the two would otherwise react. Matching the lining to the slag is the first decision in selecting a refractory.
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