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Preparation & uses of silica refractories.
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The main raw materials used are quartz, sand stone etc. the siliceous rock is crushed and ground with 2% lime and water to form a thick paste so formed is moulded into bricks either manually or using a machine-press after which they are heated to about 1500 0 C for 24 hours.

Cooling takes about 1 or 2 weeks.

During heating quartzite converts into crystobalite which during cooling gets converted into tridymite, such that silica bricks are the mixture of these two.

Uses:

  • Glass furnaces
  • Roofs of electric and hearth furnaces
  • Lining of acid converters etc.
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