Shaped Refractory
Shaped Refractory
As per the physical form, refractories are divided into two categories: Shaped refractory like bricks, having a definite shape and size; Unshaped refractory like castables, which are monolithic and well mixed granular masses and does not have any specific shape and dimension.
Shaped refractories are the most common and conventional ones. Shapes may be standard ones and special types. Standard shapes are usually required in vast quantities to construct a kiln or furnace. Special shapes are specially made for particular kilns or furnaces, with very specific shape and dimensions and are generally required only in limited quantities.
A relatively high basic character with a wide natural availability coupled with limited hydration character has made magnesia the most suitable material for basic refractories. In most of the application areas in highly basic environments, especially the slag contact areas of steelmaking and steel-processing applications, refractories containing magnesia is most suitable and being practiced globally. Magnesium-based shaped refractories mainly include:
• Magnesia bricks, are mostly used in the backup lining of steel converters, steel ladles, electric arc furnaces, top part in the checker work of glass tank furnace regenerators, in lime kilns, etc.
• Magnesia–carbon bricks, are mainly used in steelmaking converter (BOF), EAF, steel ladles, and secondary steelmaking. The complete BOF lining is done by these refractories with varying carbon content, due to stringent application conditions.
• Magnesia–spinel bricks, are used in cement processing, which involves the production of clinker in the transition and burning zones of rotary kilns.
• Magnesia–chrome bricks, are used in secondary steelmaking process. Relatively low-grade mag–chromes are used as backup lining in the steel converter and steel ladle.
• Magnesia-dolomite bricks, are mostly useful for the secondary steel making processes and mainly used for the lining of LRF, AOD, VOD, EAF, etc.
For shaped refractories, the main requirements are their density and porosity and dimensional tolerance. IMC can provide corresponding high grades of dead burnt magnesia (DBM) and fused magnesia (FM) as raw materials of producing shaped refractories.
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