Corundum Bricks For Glass Melting Furnaces

The lining material of a glass melting furnace directly determines the furnace’s lifespan, making material selection crucial. Corundum bricks, with their excellent comprehensive properties, have become the preferred refractory material in this field.

1.Operating conditions and lining material selection standards for glass melting furnaces

The glass melting furnace has a high internal temperature, a fast glass flow rate, and is highly corrosive. Therefore, the lining material must simultaneously meet the following four requirements.

① High fire resistance;
② Erosion resistance;
③ Erosion resistance;
④ Thermal shock stability.

Generally, silica bricks are often used for the upper structure of glass melting furnaces, while magnesia-chrome bricks are often used for the regenerator.

However, corundum refractory bricks are usually preferred for critical parts that come into contact with molten glass. Its alumina crystal structure remains stable even at high temperatures.

Of course, it’s also important to note that the temperature difference between different areas of the kiln is quite significant. Therefore, refractory bricks need to be matched in sections and cannot be generalized.

2.Characteristics and Classification of Corundum Bricks

(1)Characteristics

The characteristics of corundum fire bricks are mainly reflected in three aspects.

First, the main crystalline phase is corundum, and the load softening temperature exceeds 1700℃.

Secondly, it has strong resistance to erosion. It has strong resistance to acidic or alkaline slag, metals and molten glass.

Third, it has high compressive strength at room temperature (up to 340MPa).

(2)Classification of corundum bricks

These types of bricks on the market are usually classified by their aluminum content, including ultra-pure corundum bricks, 99% corundum bricks, 90% corundum bricks, corundum mullite bricks, etc. The numbers represent the percentage of alumina.

Meanwhile, the price of this type of refractory brick increases with aluminum content and bulk density; the higher the purity, the more expensive it may be. Of course, their performance will certainly be different.

Therefore, when purchasing, it is necessary to not only look at the unit price, but also calculate the cost per unit furnace life.

3.Selection of Refractory Brick Manufacturers

When selecting a corundum brick manufacturer, the focus should be on the source of raw materials, sintering temperature, and finished product testing rate.

Meanwhile, high-quality refractory brick manufacturers usually have kiln design consulting capabilities and can recommend matching models based on the furnace structure to avoid material over- or under-performance.

Therefore, although the initial screening requires time investment, the overall quality is guaranteed once a long-term partnership is established with a reliable manufacturer.

Henan Ruitai Lianxin Refractory Materials Co., Ltd. has been specializing in refractory materials for 20 years. We not only provide customers with high-quality refractory bricks that meet quality standards, but also offer solutions tailored to specific kiln conditions.

If you have any needs for refractory materials, please feel free to contact us. We offer not only corundum bricks, but also high-alumina bricks, magnesia series bricks, refractory castables, ramming mixes, and other high-quality refractory materials.

Choosing Ruitai Lianxin means choosing strength.