Question

Silica refractories are also known as

• A. Acid refractories
• B. Basic refractories
• C. Neutral refractories
• D. Magnesia refractories

Hint:

Silica refractories resist acidic slags but react with basic slags, hence classified as acidic.

Answer 1

The Correct Option is A

Step 1: Understanding silica refractories.
Silica refractories are primarily composed of silica (SiO$_2$). Their chemical behavior depends on the nature of silica, which reacts readily with basic slags but remains stable in acidic environments.
Step 2: Classification of refractories.
Refractories are classified into acidic, basic, and neutral types based on their chemical resistance to slags. Silica-based materials fall under acidic refractories because they resist acidic slags but react with basic slags.
Step 3: Analysis of other options.
(B) Basic refractories: These include magnesia and dolomite refractories.
(C) Neutral refractories: Examples include alumina and chromite.
(D) Magnesia refractories: These are basic refractories, not silica-based.
Step 4: Conclusion.
Therefore, silica refractories are correctly known as acid refractories.