Description of Mullite Insulation Brick
Mullite lightweight insulating bricks are lightweight refractory bricks with mullite as the main crystalline phase. Typically, the alumina content ranges from 42% to 72%. In addition to mullite, the mineral composition also contains glass phase and square quartz (SiO2) with lower alumina content; those with higher alumina content also contain small amounts of corundum (Al2O3).
Technical characteristics of mullite insulation brick
| Name | MLL-JM23. | MLL-JM26. | MLL-JM28. | MLL-JM30 |
|---|---|---|---|---|
| AL2O3(%) | 38-44 | 50-58 | 65-70 | 70-73 |
| Fe2O3(%) | 1 | 0.9 | 0.8 | 0.7 |
| Classification temperature (℃) | 1350 | 1430 | 1540 | 1600 |
| Bulk density (g/cm³) | 0.6-1 | 0.8-1 | 0.8-1 | 0.8-1 |
| Linear heating variation (%) CT-30 °C*8h | 1250℃ -0.5 | 1400℃ -0.5 | 1500℃ -0.5 | 1550℃ -0.5 |
| Cold crushing strength (mpa) | 3.0-4.5 | 3.0-4.5 | 3.0-4.5 | 3.0-4.5 |
| Modulus of rupture (MPa) | 1.5 | 1.7 | 1.8 | 2 |
| Thermal conductivity400°C(W/m.k) | 0.25 | 0.27 | 0.32 | 0.41 |
| Thermal expansion1000°C (%) | 0.5 | 0.7 | 0.8 | 0.9 |
Production process mullite insulation bricks
The manufacturing process of mullite insulation bricks consists of the following main steps:
STEP 1: Preparation of raw materials
The raw materials for the production of mullite insulation bricks mainly include mullite, high alumina materials and light additives.These raw materials need to be sieved, weighed and mixed to ensure the ratio is accurate.
STEP 2: Molding
Once the raw materials are mixed, they must be placed in a molding machine for molding.Molding machines typically use extrusion or briquetting for molding to ensure that the density and size of the bricks are consistent.
STEP 3. Drying
The molded bricks need to be dried to remove moisture from them.Controlling the temperature and drying time is very important, which will affect the quality and performance of the brick.
STEP 4. Sintering
The dried bricks are placed in a sintering kiln to produce insulating bricks of a certain strength and density.
STEP 5. Cutting and polishing
Unlike the production process of fireclay insulation bricks, lightweight mullite insulation bricks need to be cut after sintering to achieve the customer's required dimensions, and the surface of the bricks need to be polished to improve their appearance.
STEP 6. Checking and packing
After sintering and processing, the lightweight mullite insulation bricks must be inspected for quality. The inspection includes checking the bricks for size and appearance. Qualified bricks will be placed in a warehouse for shipment and use.
Advantages of mullite insulation bricks
Lightweight mullite insulating bricks have excellent thermal insulation properties and are able to reduce heat transfer in high temperature conditions. Due to its high porosity, it is able to form a gas barrier, thus effectively reducing heat transfer.
Mullite thermal insulation bricks have a low melting point. Due to its low thermal conductivity, mullite thermal insulation bricks store very little thermal energy, and the energy saving effect is evident in intermittent operation.
Despite their light weight, mullite insulating bricks have a stable structure, can withstand high pressure and have a high compressive strength.
The mullite insulation brick has air bubbles, and it is lightweight, so it is easy to install, and it can reduce the burden on construction personnel.
Application of lightweight mullite insulation bricks
Mullite heat insulation brick can be used in glass furnace, tunnel kiln insulation temperature insulation furnace, improve the service life of furnace and kiln and production efficiency.
Mullite insulating bricks can be used to repair high-temperature equipment such as masonry furnaces or to repair partially damaged areas.
Mullite insulating bricks can be used in aerospace applications to protect the thermal insulation of high temperature equipment such as rocket engines and jet engines.
In petrochemical equipment, mullite insulated bricks can be used in the manufacture of catalysts, heat exchangers, reactors and other key components.
Mullite insulating bricks can be used in the lining, roof and spigot of various high temperature furnaces to improve the insulation effect of the equipment and reduce energy consumption.
In the electric power industry, mullite insulation bricks can be used for thermal power plants, nuclear power plants and other equipment insulation locations.
Kerui Refractory Product Certification
Kerui Refractory implements strict product quality control and quality inspection system. Kerui Refractory has many certificates such as ISO, CE and SGS etc. Our products such as refractory brick, thermal insulation material, refractory mixture for injection molding and so on meet international standards and requirements for quality, safety and performance. Kerui products are trustworthy.
Kerui Refractory quality control
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Kerui Refractory is trustworthy
Kerui has a professional team of talented workers, perfect service system, clear production process, strict quality control system. Kerui products are sold domestically and exported to Russia, Italy, France, Spain, Turkey, Bahrain, Korea and other international markets, and have won the unanimous praise of users.
