Question:
Alumina silicate group of refractories should have more than \(\ldots\ldots\ldots\ldots\ldots\) of Alumina.
Alumina silicate group of refractories should have more than \(\ldots\ldots\ldots\ldots\ldots\) of Alumina.
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Alumino-silicate refractories contain alumina and silica, and the alumina content should be more than \(45\%\).
Updated On: May 7, 2026
- \(45\%\)
- \(25\%\)
- \(10\%\)
- \(30\%\)
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The Correct Option is A
Solution and Explanation
Alumino-silicate refractories contain mainly alumina and silica.
The important oxides present are:
\[
Al_2O_3
\]
and
\[
SiO_2.
\]
The percentage of alumina decides the classification and refractoriness of the material.
As alumina content increases, the refractoriness and high-temperature performance generally improve.
The alumina silicate group of refractories should contain more than:
\[
45\%
\]
alumina.
Materials like sillimanite, kyanite, and andalusite belong to alumino-silicate refractory raw materials.
Since the required alumina percentage is more than \(45\%\), the correct answer is:
\[
45\%.
\]
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