# Silica refactories:
Quotiz, ganister white sand, etc. are used as raw material in making silica refractories. Quartzite Ganester and White Sand are used as refractory silica stones. Their chemical analysis is different. It will contain at least 90.0% silica if used for kindergarten purposes. And alumina oxide as iron and alkali as alloying material shall not exceed 5.0%. All the refractory bricks which are made of millika national raw material and other raw materials are called silica vidyakatri bricks.
# Properties of silica bricks
# Silica: The characteristics of bricks are as follows:
1. It is a type of acid refractories.
2. This type of brick can hold a weight of 4 kg per square cm.
3. It melts at temperatures from 18106 to 1830C.
4. It does not contract until the temperature of the calculation. And it's 600 seconds. To be 1800
He has the ability to withstand the extremes of the temperature range.
5. This prevents the tones of the island furnace from being heard. Such as iron oxide and acid.
6. It is often attacked by alkaline metals and chlorine.
# Raw materials used in silica bricks:
1. Siliceous rock
2. Quartzite
3. Ganister
4. White Sand
5. Quartz
6. Hydrated Lime
7. Sulpfile Lye
149.153 SRY0