Classification of Fire Bricks : Following three Types :
Silica fire bricks / Acidic Bricks :
These are acidic in character 95 % Silica & their raw material is pure quartz (sio2); or sandstone of high silica content. The moulded units are burnt to around 1500c. Manufacture from Sand Stones, Quartzite etc.
Uses : Lining of furnaces to resist the action of acidic slags.
Magnesite Fire Bricks / Basic Refractories :
They are classed among the basic refractories. Principal raw material is magnesium oxide for which the rock dolomite is a major source.
Bauxite Fire Bricks :
These also form a very important class of basic refractories. They are made from the rock bauxite. (al2o32h2o) which may be mixed with some clay (fire clay type).
Uses :
Blast Furnace, Copper Furnaces etc.
Chromite Fire Bricks :
Neutral class of Refractories. Raw material used for these bricks is a mineral called CHROMITE.
This mineral is a double oxide of chromium and iron in its composition for making refractories some alumina and silica are also added to make a typically neutral material chromite fire bricks are capable of resisting both the acidic and basic environments in a furnace. These find extensive applications in the steel making furnaces.
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