Lightweight insulation bricks are a type of thermal insulation material, which refers to insulation bricks with high porosity, low volume density, and low thermal conductivity. Lightweight insulation bricks are characterized by a porous structure, with a porosity of generally 40 to 85%, and high thermal insulation. At this stage, the most common and commonly used types of lightweight insulation bricks in the market are. Diatomite lightweight insulation bricks; mullite insulation bricks; alumina hollow ball bricks; high alumina poly light insulation bricks; lightweight clay bricks; lightweight silica bricks, etc.
Light Weight Bricks for Industrial Kilns
The heat loss of industrial kilns through the furnace body generally accounts for about 22% to 43% of fuel and electric energy consumption. This huge data is directly related to the cost of the unit output of the product. To reduce costs and respond to the policy of environmental protection and resource conservation, lightweight insulation bricks have become a favored product in the industrial high-temperature kiln industry.
Weight Bricks are lightweight refractory insulation materials with high porosity, low volume density, and low thermal conductivity. Lightweight refractory bricks have a porous structure (porosity is generally 40%–85%) and high thermal insulation performance. The use of lightweight insulation bricks saves fuel consumption, greatly shortens the heating and cooling time of the kiln, and improves the production efficiency of the kiln. Due to the light weight of lightweight insulation bricks, it saves time and effort during masonry operation, and greatly reduces the weight of the furnace body. However, due to the large porosity of lightweight insulation bricks, the internal structure is relatively loose. Most lightweight insulation products cannot come into direct contact with molten metal and flames.
Lightweight insulation bricks are mostly classified according to their operating temperature in the high-temperature kiln industry.
- Low-temperature lightweight insulation bricks, operating temperature 600–900℃, such as lightweight diatomite.
- Medium-temperature lightweight insulation bricks use temperatures of 900–1200℃, such as clay lightweight insulation bricks.
- High-temperature lightweight insulation bricks, the use temperature is greater than 1200℃, such as lightweight corundum, mullite lightweight insulation bricks, alumina hollow balls, etc.
Light Weight Bricks are mostly used as insulation, lining, and insulation in kilns. In recent years, newly developed mullite lightweight insulation bricks, alumina hollow ball bricks, high-alumina poly light bricks, etc. They are all made of kyanite and can be directly exposed to flames. Due to the use of lightweight insulation bricks, the thermal efficiency of industrial high-temperature kilns has been greatly improved. Therefore, the widespread application of Light Weight Bricks is inevitable.
New heat-insulating refractory material for high-temperature kilns – corundum-mullite lightweight bricks
Refractory materials for high-temperature kilns have evolved from heavy corundum bricks and chrome corundum bricks to alumina hollow ball bricks with lower volume density. It has good thermal insulation performance, is lightweight, has good high-temperature resistance, and gradually replaces heavy corundum bricks. However, alumina hollow ball bricks have poor thermal shock stability and high volume density, making it difficult to produce specialized products. According to the use conditions of high-temperature kilns, refractory material manufacturers have developed and produced corundum-mullite lightweight insulation bricks with good thermal insulation performance, high-temperature resistance, and good thermal stability. It has a small volume density, high strength, low thermal conductivity, regular appearance, and white color. It has good thermal insulation, energy-saving performance, and anti-flaking ability, and is a good lining material for various bare-flame open-fired kilns.
Rongsheng Light Weight Bricks Manufacturer
The heat storage loss of industrial kiln masonry and the heat dissipation loss of the furnace body generally account for about 24 to 45% of fuel consumption. Using lightweight bricks with low thermal conductivity and small heat capacity as furnace structural materials can save fuel consumption. At the same time, because the kiln can heat up and cool down quickly, it can improve equipment production efficiency. It can also reduce the weight of the furnace body, simplify the furnace structure, improve product quality, lower the ambient temperature, and improve working conditions. Precautions when using Light Weight Bricks.
- Lightweight refractory bricks have large porosity and loose structure, and cannot be used in parts that are in direct contact with slag and liquid metal.
- The mechanical strength is low and cannot be used for load-bearing structures.
- The wear resistance is very poor and should not be used in parts that are in contact with the charge and suffer serious wear.
Lightweight refractory bricks generally refer to refractory bricks with a density of less than 1.3 g/cm3. Because lightweight refractory bricks have low density, high porosity, low thermal conductivity, and good thermal insulation. As well as certain characteristics such as compressive strength, it has been widely used in heat treatment equipment.
