How to choose right refractory materials used in furnaces

This article will introduce the types and application fields of refractory materials. Through this article, you can have a comprehensive understanding of refractory materials and learn more about the advantages of refractory materials. On the other hand, understand the main use areas and manufacturing processes of refractory materials.

How to choose right refractory materials

Refractories should have high structural strength and can withstand long-term mechanical loads at operating temperature. Refractories should have good resistance to the components of the batch materials, molten glass and gaseous substances. Refractories should produce minimum contamination to the glass.

Types of Refractory Materials

1. Fired Refractory Products

2. Non-Fired Refractory Products

3. Special Refractory

4. Monolithic Refractory (Bulk Refractory Or Refractory Concrete)

5. Functional Refractory Materials

6. Clay Bricks

7. High Alumina Bricks

8. Silica Bricks  

9. Magnesium Bricks

10. Corundum Bricks

11. Ramming Material 

12. Plastic Refractory 

13. Casting Material

Refractory material characteristics:

Depending on the working conditions of various steel furnaces, the working conditions of refractory materials were found to be very difficult. Therefore, the refractory materials used must have the following characteristics:

High-temperature resistance and high fire resistance.

Wear resistance and wear resistance of heat-resistant steel and slag.

For the intermittent operation of the steelmaking furnace, the refractory material must have excellent thermal shock and fracture resistance.

It has high mechanical strength, can tilt the blows of the furnace, and withstand the load of the furnace without damage.

There are many operations and processes for secondary steelmaking, such as vacuum degassing and ladle refinancing. Refractory materials use a unique combination of various bricks to meet diverse requirements. The following can be observed:

The high temperature and long retention time of molten steel in the ladle.

Wide variation of slag composition Various types of vacuum treatment. Thermal changes.

The stirring of molten steel causes erosion of molten steel movement.

In all ladle refining processes such as ladle furnaces, ASE-SKF and VAD processes,ladle MgO-C bricks are used in areas where slag and steel are in contact. For general walls, high alumina bricks are widely used. The bottom zircon bricks are used to prevent molten steel from penetrating into the joints of the bricks. In some cases, MgO-C, Al2O3-C bricks and molds are used in the impact area. MgO-C bricks with added metal pairs have high thermal strength and excellent oxidation resistance.

Refractory materials include natural ores and various products made by certain purposes and requirements through certain processes, which have certain high-temperature mechanical properties and good volume stability. They are the necessary materials for various high-temperature equipment.

FAQ:

How do you select refractory materials?

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 the basics of refractory materials?

Refractory material is a material that is resistant to decomposition of heat, pressure or chemical attack and retains strength and form temperatures. The basic refractory materials include alumina, silica, magnesia and lime.

How are refractory material made?

This process involves using an electric arc furnace to melt the refractory raw materials, then pouring the melted materials into sand-forming molds. Another type of refractory process is ceramic fiber production. In this process, calcined kaolin is melted in an electric arc furnace.

Through this article, you already had an in-depth understanding of the advantages and application fields of refractory materials.What’s more,you can also view company news to learn more about refractory  industry news. If you need refractory materials, please contact me.