What is the percentage of alumina in good brick earth?

What is the percentage of alumina in good brick earth?

Right Answer is:

20 to 30%

SOLUTION

Alumina: A good brick earth should contain 20-30 percent of alumina. It imparts the property of plasticity to the earth. An excess of alumina causes shrinkage and warping of bricks during drying and burning and it becomes too hard when burnt.

Composition of good brick earth :

→ Silica : 50 – 60%
→ Alumina : 20 – 30%
→ Lime : < 10%
→ Magnesia : < 1%
→ Iron oxide : < 7%

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