Neutral lining material for induction furnace

1. Introduction to materials

The neutral lining material of the induction furnace uses high-quality aggregate as the main raw material, and adds a variety of different binders and special properties of micro-powder materials, high temperature resistant binders, anti-cracking agents, anti-seepage agents and other composite materials. This kind of composite micropowder material has strong liquid corrosion resistance, strong resistance to extreme cold and extreme heat, high flexibility, strong impact resistance, high load softening temperature, high high temperature compressive strength, high high temperature flexural strength, and good slag resistance And a series of advantages. It is made by fine proportioning and mixing. All special high-grade materials are used, which have better performance in many aspects such as softness, refractoriness, slag resistance, corrosion resistance and thermal shock performance. Therefore, it is determined and guaranteed that the material can be used as a high-quality furnace lining material with stable and excellent performance under harsh or even harsh smelting conditions. The material has a series of advantages such as erosion resistance, strong stability, no cracking, strong operability, and high refractoriness. Its special design prevents it from reacting with the solution during use. The material is a thermally condensed refractory material that uses dry ramming or dry vibration, and does not require maintenance and a long baking cycle. During heating, the furnace lining ceramics are reacted and sintered to obtain extremely high hot surface strength. So as to resist the erosion and erosion of the liquid. While the unsintered liner layer maintains a granular state, the underlayer can effectively prevent local stress concentration and prevent the extension and expansion of hot surface cracks. It can effectively prevent the infiltration of liquid, and solve the phenomenon of slagging and nodulation on the surface of the furnace charge, which greatly improves the service life of the furnace lining.

2. Features of neutral lining material for induction furnace

(1) It should have excellent physical and chemical stability and not easily react with molten metal.

(2) Non-sticky slag (or less sticky slag), easy to clean and keep the furnace lining intact.

(3) It has high strength. Because the coreless furnace produces strong stirring force when melting metal, the melt has strong erosion on the furnace lining. Therefore, only the material is dense and high in strength, can it be washed and run safely and for a long time.

(4) It has good thermal shock stability to meet the change of cold and heat caused by the continuous pouring of liquid from the furnace body.

At present, foreign large-tonnage centerless induction furnaces generally use neutral oxides as the lining.

material selection

The main material is the main body of the refractory product and the basis of the characteristics of the formulated material.

At present, foreign large-tonnage centerless induction furnaces generally use neutral oxides as the lining. , Neutral material with alumina as the main component. According to our research results: the lining material mainly composed of neutral oxides is the most suitable material for large-tonnage electric furnaces.