What are the types of intermediate frequency furnace lining materials?

The quality of the intermediate frequency furnace lining determines the service life, and it needs to have excellent refractory performance and stability to be put into use better. The intermediate frequency furnace lining of different materials will react differently with the raw materials during use, so what material is selected depends on Use it to judge, let me tell you what material is used for the lining of the intermediate frequency furnace.

1, acid lining

Acid furnace lining is mainly quartz sand, which is cheap, widely distributed, good in insulation, low in construction requirements, less in use, and relatively stable in production. There are two phase changes during the heating process, the dimensional stability is poor, the chemical stability is not ideal, and it is easy to react with the slag to form corrosion, which is the main reason for affecting the service life of the intermediate frequency furnace lining. In order to prevent these shortcomings, fused silica can be used. 2 When the content of silicon oxide is greater than 99%, the refractoriness is obviously improved, close to the melting point, and there is no two phase transitions when heating, there is no heating scale change, and the thermal shock stability is also greatly improved.

2, Neutral furnace lining

Using fused corundum as the lining of the intermediate frequency furnace, because the melting point of white corundum is as high as 2050 degrees Celsius, the hardness is as high as 8, the wear resistance, high temperature resistance, and chemical stability are better than quartz. It is suitable for high temperature cast steel or large furnace lining. The characteristics are the same as Due to the disadvantages of large phase transformation and thermal expansion coefficient, the addition of spinel powder in practice can significantly improve corrosion resistance and dimensional stability.

3, basic furnace lining

The traditional basic furnace lining is formed by dry ramming of magnesia, which has the advantage of high refractoriness, close to 2800 degrees Celsius, but the disadvantage is that the expansion coefficient is large, easy to crack, the magnesia lining is corrosion-resistant, long service life, low price, and widely used. Adding white corundum powder or spinel powder can significantly improve the service life.

4, Spinel lining

Spinel lining is a new type of furnace lining material. It is formed by alumina and magnesia, pre-formed by high temperature sintering or electric melting, and then produced in various particle sizes as required. Using borax or boric acid, it has the advantages of white corundum lining and magnesia lining, and avoids its shortcomings. It is the development direction of large-scale intermediate frequency lining and high-temperature lining. Many imported lining materials belong to this type.

5, New material furnace lining

Adding ultrafine powder (mostly in a few microns) in traditional furnace lining materials can improve the corrosion resistance and thermal shock stability of furnace lining materials, such as silicon powder, alumina powder, white corundum powder, spinel powder, etc.