What is the percentage of alumina in good brick earth?

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RRB Paper · Accepted Answer

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%

What is the percentage of alumina in good brick earth?

5 to 10%

20 to 30%

1 to 5 %

45 to 55%

The correct answer is `No. 2: 20 to 30%`

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What is the percentage of alumina in good brick earth?

5 to 10%

20 to 30%

1 to 5 %

45 to 55%

The correct answer is No. 2: 20 to 30%

The correct answer is `No. 2: 20 to 30%`