High Alumina Refractory Bricks
High Alumina Refractory Bricks
High alumina refractory bricks are used in many industries that require furnaces or kilns. They are particularly suited for processes that use corrosive or abrasive chemicals and have a long service life. They are also energy-efficient and insulated better than other kinds of bricks.
These refractory bricks are made from a mixture of alumina and silica or alumina and mullite. They can be shaped into standard shapes or customized to fit various needs. These bricks are often used in the construction of refractory lined blast furnaces, hot blast stoves, reverberatory furnaces, and rotary kilns.
They are also used for lining other industrial furnaces such as sulphur recovery units (SRUs). They have excellent heat conductivity, can be easily relined, and are more volume stable when reheated than fireclay bricks.
Typical uses for high alumina refractory bricks include:
The bricks are pressed into form on rollers and then placed in cylindrical autoclaves for 12 to 20 hours at a pressure of 185degC, preferably 195degC. After that the bricks are cooled in the autoclave and removed from the molds. They are then shipped to the end user for installation into the furnace.
A typical refractory kiln will use a few thousand high alumina refractory bricks. They are also useful in a variety of regenerative checker-walls and in the reaction chambers of thermal reactors.
These bricks have a high refractoriness under load, which is significantly higher than fire clay or semi-silica bricks. This is because the alumina content in high alumina bricks is significantly higher than in fireclay bricks. This allows the alumina to bind with silica in the binder phase and form a vitreum body.
As a result, these bricks are more suitable for use in chemical reactors and metallurgical furnaces than sintered bricks made from conventional methods. These refractory bricks are also more readily manufactured than fireclay or sand-lime refractory bricks and have the advantage of being less expensive to produce.
They can be manufactured using a simple and inexpensive process by which refractory binders are added to a mixture of alumina and silica. These binders can be slaked lime or slaked magnesia, in a quantity of 5% or 1-25% by weight, respectively, to make the bricks more stable when fired at high temperatures.
In addition, these refractory bricks are more mechanically stable than a pure alumina or silica brick and have a higher PCE value than the same brick produced without a binding agent.
Another feature of these refractory bricks is that they have a low impurity content, which means that they can be pressed to a greater extent than a pure alumina or silica refractory brick. This is especially important when refractory liners are used in sulphur recovery units because they need to resist high temperatures for a prolonged period of time.
These refractory bricks are also very environmentally friendly and can be used in a variety of different applications. They are perfect for roofing materials, landscaping projects and for constructing refractory lined furnaces or kilns.
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