Fire Clay Brick
Fire Clay Brick
Fire clay brick is a type of refractory material, which has excellent heat resisting properties. It is used in kilns, furnaces and other applications where it has to be exposed to high temperatures. It has a higher fusion point than normal bricks. It is made by mixing clays with a suitable percentage of silica and alumina. It also has a small amount of detrimental minerals, such as lime, magnesia and iron oxide.
Besides, it has a good thermal conductivity that makes it energy efficient. Its fusion points are up to 1,600°C and its durability and strength make it an ideal material for lining furnaces, fireplaces and utensils.
These bricks have a low porosity and high density. They are also resistant to abrasion. They are stacked into refractory blocks, tiles and precast shapes to form walls of furnaces, boilers or other process vessels.
There are several different types of fire clay bricks, which can be made from a variety of materials. Some of the common types include chamotte bricks, fire clay and refractory ceramics. The kilns in which these bricks are fired produce an intense heat and they have a high fusion point.
The composition of the fire clay brick is a combination of 'non-detrimental' silica and alumina and a small quantity of detrimental minerals, such as limestone, iron oxide and magnesia. The optimum ratio of these minerals is 60 to 70% of silica and 25 to 35% of alumina.
When fire clay is pressed into shape, it is then fired in a kiln to partially vitrify the bricks. The kiln temperature is usually between 1350°C and 1400°C.
Acid brick is a type of fire clay brick that has additional minerals added to it for extra resistance to chemicals or weathering. These are known as acid-resistant bricks and they have a greater proportion of non-detrimental silica and alumina than regular fire clay. For binding purposes, lime is sometimes added to these bricks.
Generally, a small proportion of the normal refractory clay is mixed with the acid-resistant clay in order to obtain a mixture that has the desired properties. The resulting brick has good strength and is highly resistant to the corrosive action of acids, which makes it an excellent choice for many industrial applications.
Another type of fire clay brick is made by blending a blend of various refractory clays with a special binding agent such as grog or cement. This mix is then fired in a kiln until it becomes part vitrified and glazed.
The refractory ceramics industry is one of the largest users of these bricks. It produces items such as crucibles, saggars and other metalworking utensils. It is also used in the manufacture of sanitary ware, kiln furniture and pipes.
In addition, fire clay is a common ingredient in the production of stoneware pottery. It has a very high fusion point, which helps it withstand the high temperatures required for producing the finished ceramic pieces.
The refractory clay brick is also available in a variety of sizes and thicknesses. It can be stacked in a refractory block, tile or precast shape and fired in a kiln to form a wall of a furnace, boiler or other process vessel.
Tags:acid proof brick
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