Rice hulls are a primary element to silica cause the bricks is strong and able to tolerate more light but silica is the ability to absorb high water. If the bricks are high humidity will result in poor quality, and should be suitable for a quantity of silica and shell cockle is the primary element is Ca. When burned, it became the CaO to add strength, but if there is a large amount in the high temperature combustion cause reactions with air and make a difference in the bricks. Therefore, there should be enough quantity.
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