Classification of silicon refractory bricks

Silicon refractory bricks are acidic refractory materials with good resistance to acid erosion. They have good thermal conductivity and high refractoriness under load, generally above 1620°C, which is about 70~80°C lower than their refractoriness. The thermal conductivity of silica bricks generally increases with the increase of working temperature. During the oven baking process, the volume of silica bricks generally increases with the increase in temperature. Therefore, silica bricks are ideal refractory products for coke ovens. Silica bricks are widely used in important parts of modern large and medium-sized coke ovens (such as combustion chambers, ramps, and regenerators). Silica bricks are widely used in hot blast stoves, coke ovens, glass kilns, т.б.

What are the types of silica bricks?

The general types of silica refractory bricks are ordinary silica bricks, dense silica bricks, semi-dense silica bricks, slightly expanded silica bricks, lightweight silica bricks, acid-resistant silica bricks, alkali-resistant silica bricks, high-purity silica bricks, fused silica bricks and refractory clay silica bricks.

Characteristics of silica bricks

Chemical composition: Silica bricks mainly comprise silicon dioxide (SiO2), usually containing more than 90% silicon dioxide.

· High-temperature resistance: Silica bricks have good high-temperature resistance and can be used at temperatures up to 1750°C.

· Acid resistance: Silica bricks have good resistance to acidic slag and gas and are suitable for acidic environments.

· Thermal shock stability: Silica bricks can withstand rapid temperature changes and have good thermal shock stability.

· Chemical erosion resistance: Silica bricks have high resistance to erosion by most acids and salts.

Introduction of different types of silicon refractory bricks

Ordinary silica brick: This is the basic silica brick type, mainly made of natural quartz sand or other siliceous materials, suitable for the lining of general industrial furnaces.

Dense silica brick: This silica brick has a higher density and lower porosity, suitable for occasions requiring higher thermal efficiency and wear resistance.

Semi-dense silica brick: Compared with dense silica brick, semi-dense silica brick has a slightly higher porosity, but still has good refractory properties, suitable for some application parts that do not require high density.

Micro-expanding silica brick: As mentioned earlier, this silica brick exhibits less expansion at high temperatures, which helps to reduce gaps and cracks caused by thermal expansion and contraction.

Lightweight silica brick: This silica brick contains a large amount of lightweight aggregates, such as expanded perlite or vermiculite, and is used for insulation and heat loss reduction.

Acid-resistant silica brick: This silica brick is suitable for environments that resist acidic slag and chemical attacks, such as certain chemical and metallurgical processes.

Alkali-resistant silica brick: In alkaline environments, this silica brick can provide good resistance to chemical attack.

High-purity silica brick: This type of silica brick is made of high-purity silica raw material and is suitable for use in areas where there are strict requirements on material purity.

Fused silica brick: Silica brick produced by the fusion process has high density and uniformity and is suitable for high-temperature and high-load industrial furnaces.

Refractory clay silica brick: This brick combines the characteristics of refractory clay and silica, providing good refractory performance and moderate cost-effectiveness.

How to choose suitable silica refractory bricks?

When choosing silica bricks, you need to consider factors such as the furnace’s operating temperature, chemical environment, thermal shock stability, and economy. Different types of silica bricks are suitable for different industrial applications. The correct choice of silica bricks can effectively improve the efficiency of the furnace and extend the furnace’s service life. If you need to purchase silica bricks, please contact us. Rongsheng’s professional team can make an excellent milk conversion solution for you.