What is the refractory lining of blast furnace?
A modern blast furnace (BF) is refractory lined to protect the furnace shell from the high temperatures and abrasive materials inside the furnace….Refractory lining of blast furnace.
| Tab 2 Blast furnace refractories | ||
|---|---|---|
| Tilting spout | High alumina / SiC ramming masses / Low cement castables | High alumina / SiC / Carbon / ULCC |
What are the requirements of a good refractory?
A good refractory should have low porosity. Thermal spelling is the property of breaking, cracking or peeling off a refractory material under high temperature. This causes uneven expansion and contraction within the mass of a refractory, and leads to development of uneven stresses and strains.
Which properties would be most important when lining a furnace?
Thermal shock resistance – Thermal shock resistance is one of the most important service properties. It characterizes the behaviour of refractories to sudden temperature shocks which occurs very often during the furnace operation.
What are refractory bricks made of?
For domestic uses, such as ovens, barbecue grills and fireplaces, the refractory bricks used are usually composed of clay containing mainly alumina and silica, elements capable of withstanding high temperatures. While alumina has reflective qualities, silica is an excellent insulator.
What is refractory give an example?
The definition of refractory is stubborn or hard to manage, or heat resistant. An example of someone who is refractory is a person who refuses to listen to the rules. An example of something refractory is a material like silica or alumina that are difficult to melt.
How do you choose refractory material?
Refractories should have stable volume at high temperature and the residual expansion and contraction should be small. Heat capacity, thermal expansion coefficient, thermal conductivity and other thermal properties should meet the requirements. Refractories should have neat appearance and accurate shape and size.
What are three different types of refractories?
Depending on temperatures and service conditions of the applications such as boilers, furnaces, kilns, ovens etc, different types of refractories are used.
- Fireclay refractories.
- Silica brick.
- High alumina refractories.
- Magnesite refractories.
- Chromite refractories.
- Zirconia refractories.
What can I use as refractory cement?
Refractory Cement Recipe #1
- Portland cement (You can purchase a 94 lb. bag at your local hardware store for less than $10.)
- Perlite (Can be purchased for $10 to $25.)
- Silica Sand (A 50 lb. bag costs less than $25.)
- Fire clay or Well drillers mud (A 50 lb. bag averages less than $10.)