What are fused cast refractories?

What are fused cast refractories?

Fused cast refractories. Fused cast refractories are manufactured by electro-fusing and casting process. Carefully selected high-purity raw materials are melted in Heroult type electric arc furnace at 1900 – 2500 ℃ and cooled to solidify after pouring into molds.

Which refractory is used in glass melting furnaces?

Fused cast AZS is so far the primary refractory brick for glass furnace. In tin bath, alumina forming brick such as sillimanite and bottom block are used typically. Silica brick is used also quite frequently in glass furnace.

What is the refractory material used in the furnace?

Silica bricks are often used in the iron and steel industry as furnace materials. An important property of silica brick is its ability to maintain hardness under high loads until its fusion point. Silica Refractories are usually cheaper hence easily disposable.

What is AZS refractory?

Fused cast alumina-zirconia-silica (AZS) ma- terials are the preferred refractories for the furnace area in contact with the glass melt when melting soda-lime-silica glass. They are also used as sidewall material in the combustion chamber as well as crown mate- rial especially with oxygen fired furnaces.

What is AZS block?

Fused Cast AZS block is also called electro Zircon corundum block, which is abbreviated as AZS because it contains Al2O3－ZrO2－SiO2. After Alumina powder and zircon sand melting in electric furnace, they are cast into various molds and cool themselves down to become white solid.

What is glass refractory?

The refractories used in glass furnaces are in contact with the glass, the superstructure, the crown and the regenerator materials and which is why they are constrained to chemical, physical, as well as thermal effects.

What are refractories for glass?

Silica refractories are the preferred material for crown construction due to its affordability, low stoning potential, insulating capability, resistance to creep, low thermal expansion after 600°C and compatibility with the batch material.

Is glass a refractory material?

A refractory material is one that has high tolerance of temperature, and at high temperature is resistant to cracking, degradation or other chemical attack. As a prime source of silica(2), ground glass is therefore an acidic refractory material; silica is the most commonly used refractory(3).

What is the most commonly used refractory material and why?

As fireclay brick is relatively cheap and its raw materials are widespread, it is the most common type of refractory brick and used widely in most furnaces, kilns, stoves, regenerators, etc. Silica brick is a refractory material containing at least 93\% SiO2.

What are neutral refractories?

A refractory that is neither strongly basic nor strongly acid, such as chrome, mullite, or carbon. Ref: ARI. ii. A refractory that is resistant to chemical attack by both acid and basic slags, refractories, or fluxes at high temperatures.

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