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Additional recommended knowledge
The oxides of magnesium (magnesia) and calcium (lime) are the most important refractory materials, though fireclay is widely used as well. Zirconia is used when the material must withstand extremely high temperatures. Silicon carbide is another refractory material. It is very strong at high temperatures, but will burn in the presence of oxygen, if the protective silica coating comes off. Refractories must be chosen according to the conditions they will face. For example, carbon cannot be used when it will be in contact with oxygen, as it will burn.
Types of refractories
Acidic refractories cannot be used in a basic environment and basic refractories cannot be used in acidic environment because they will be corroded. Zircon, fireclay and silica are acidic, dolomite and magnesite are basic and alumina, chromite, silicon carbide, carbon and mullite are neutral. Refractory metals are also frequently used.
Refractories are used mainly in the Iron and Steel industry and also used in other refineries and smelting processes.
Anti-abrasion refractory attached to pipes, chambers, etc, will require anchorage systems such as wire formed anchors or hexmetal to support the refractory linings.
Refractories are mainly two types, Bricks or Monolithics. Bricks are used in lining inside furnaces, smelters, ovens.....etc. Monolithics are all refractoires but not included the bricks shape. Examples for monolithics are gunning material and castables. (Andrew Adam)
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Refractory". A list of authors is available in Wikipedia.|