Fire Clay Brick
Fire Clay Brick
Fire clay is a mineral comprised of alumina and silica. This mineral is used in making refractory materials, including firebricks. It is also used in insulation and pottery. Its properties are altered by special manufacturing processes. In fact, fire clay is used in the ceramic tiles of the space shuttle.
Fire clay bricks are very heavy and have a low porosity. This means that they can withstand continuous heating and re-heating without losing their refractory qualities. As such, they are an excellent choice for a variety of applications. In addition to fireplaces, fire bricks are also used for wood fired ovens, industrial furnaces, and cooking chambers.
Fire clay bricks are typically made from a blend of different clays, though some are made with a single clay. High grade kaolin and flint clay contribute high refractoriness, while calcined clays reduce shrinkage and help in forming. The proportion of these clays depends on the desired character of the refractory brick.
Fire clay bricks can be produced in similar ways to normal bricks. However, they are subjected to much higher temperatures. Fire clay is typically light in color and has a high alumina content. Fire bricks are used in the glass, chemical, and steel industries. Fire bricks are also available in custom drawings.
The fire clay brick manufacturing process involves several stages. First, the raw materials are screened into varying particle sizes and proportions. Afterwards, the mixture is mixed with water in a Muller mixer to achieve consistency. The mix is then fed into a mechanically operated press. Alternatively, a hydraulic press is used to form bricks under pressure.
The second process involves adding lime. In contrast to alumina brick, acid bricks are used in abrasive environments. These bricks contain a lot of acid-resistance properties. They are white and can weigh up to 3 kg each. Fire clay brick is made with a mixture of alumina and silica with small amounts of lime and iron oxide.
Fire clay can be sourced from many different sources. Some potters even dig their own clay. While this may be time-consuming, it is a form of art and a source of pride for many potters. It is a good option for creating fire clay bricks if you are not a quantity producer.
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