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Lightweight Ultra-Low Conductivity Mullite Brick
Lightweight ultra-low conductivity mullite bricks are a high-end energy-saving upgrade of ordinary lightweight mullite bricks. They are based on high-purity mullite (3Al₂O₃・2SiO₂) as the main crystalline phase and adopt a microporous closed-pore composite process to construct a nanoscale fine sealed pore structure. This achieves the triple advantages of lightweight and low conductivity, including lower thermal conductivity, lower bulk density, and lower heat storage. They are specifically designed for energy-saving retrofitting of high-end intermittent kilns and high-temperature continuous kilns and are the mainstream high-efficiency heat-insulating refractory material for industrial furnaces under the dual-carbon policy.
Product Description
Description of Lightweight Ultra-Low Conductivity Mullite Brick
Lightweight ultra-low conductivity mullite fire bricks are a high-end energy-saving upgrade of ordinary lightweight mullite bricks. They are based on high-purity mullite (3Al₂O₃・2SiO₂) as the main crystalline phase and adopt a microporous closed-pore composite process to construct a nanoscale fine sealed pore structure. This achieves the triple advantages of lightweight and low conductivity, including lower thermal conductivity, lower bulk density, and lower heat storage.
Characteristics of Lightweight Ultra-Low Conductivity Mullite Refractory Brick
Exceptional Thermal Insulation and Outstanding Energy Savings
The closed micropores eliminate internal air convection, resulting in a 40-80°C reduction in furnace outer wall temperature for the same lining thickness, significantly reducing heat loss. The kiln insulation layer can be reduced by one-third, offering a clear advantage in scenarios with limited furnace size.
High-Temperature Stability and Direct Flame Resistance
The high-purity mullite skeleton has an extremely low coefficient of thermal expansion, low high-temperature creep, and even lower re-firing shrinkage. Low-alumina grades can be used as backing, while high-alumina JM28L/30L grades can be directly used as the working surface lining, eliminating the need for a layer of heavy refractory bricks and simplifying the furnace lining structure.
Excellent Thermal Shock Resistance and Strong Atmosphere Adaptability
The microporous structure buffers thermal stress, making it less prone to cracking under rapid heating and cooling. It provides long-term stability in neutral, weakly reducing, and weakly oxidizing atmospheres. The low-alkali, low-iron formula is suitable for white porcelain, lithium-ion battery anodes, and precision electronic sintering, with no product contamination.
Lightweight and cost-effective construction
The overall furnace lining weight is further reduced, and the manufacturing costs of the kiln trolley and steel structure are lowered; the bricks have high dimensional accuracy and can be cut into irregular shapes on site. Combined with ultra-low conductivity mullite refractory mortar, there are fewer mortar joints and better sealing.
Application of Lightweight Ultra-Low Conductivity Mullite Fire Brick
1. Ceramics & Electrical Porcelain Industry (Largest Usage): Roller kilns, shuttle kilns, pusher kilns (full lining, trolley insulation layer, kiln doors); low-iron, ultra-low conductivity models are preferred for white porcelain, glazed tiles, and special ceramics to prevent product yellowing; intermittent kilns offer the highest energy-saving benefits.
2. New Energy High-Temperature Sintering Kilns: Lithium-ion battery positive and negative electrode sintering furnaces, ceramic diaphragm kilns, graphitization furnace linings; high temperature control precision required, frequent temperature rises and falls.
3. Glass & Optical Glass Industry: Annealing kilns, tin bath insulation layers, small glass experimental kilns; resists alkali metal fume volatilization corrosion.
4. Petrochemical & High-End Heat Treatment Furnaces: Ethylene cracking furnaces, precision carburizing furnaces, stainless steel bright annealing furnaces, laboratory high-temperature electric furnaces; stable temperature control, reduced heat loss.
5.Metallurgical Small High-Temperature Furnaces: Forging trolley furnaces, aluminum annealing furnaces, small hot blast furnace back lining + hot face integrated lining.
Physical and Chemical Index
| Item | Lightweight Ultra-Low Conductivity Mullite Brick Type I | Lightweight Ultra-Low Conductivity Mullite Brick Type II |
| Bulk Density (g/cm2) | ≤2.5 | ≤2.3 |
| Compressive Strength at Room Temperature (MPa) | 60 | 55 |
| Softening Temperature under Load (T0.6, °C) | 1500 | 1430 |
| Thermal Shock Stability (1100°C water cooling, cycles) | 9 | 8 |
| Thermal Conductivity (1000°C, W/m.k) | 1.5 | 1.4 |
| Apparent Porosity (%) | 19 | 17 |
Advantages of Lightweight Ultra-Low Conductivity Mullite Fire Bricks
Lightweight ultra-low conductivity mullite refractory bricks possess high strength, high wear resistance, high corrosion resistance, high load-bearing capacity, low density, and excellent thermal shock resistance, fully meeting the production process requirements of large and medium-sized cement rotary kilns. Their performance surpasses that of similar products. Taking a φ4.8-meter rotary kiln with a 40-meter bricklaying length as an example, the economic benefits are analyzed as follows:
The kiln’s outer surface temperature decreases by 80-100°C, reducing fuel consumption by 1 kg per ton of clinker. This translates to a reduction of 1500 tons of standard coal consumption annually, saving approximately 1.1 million yuan.
Saving 1500 tons of coal annually reduces carbon dioxide emissions by 4300 tons, as well as sulfur dioxide, nitrogen oxides, and other harmful substances.
For the same 40-meter masonry section, this product is approximately 30 tons lighter than conventional products. The average operating current of the main drive motor can be reduced by 30A. Based on a 660V main drive motor voltage, this saves 19.8 kWh per hour, or 156,800 kWh per year. At an average industrial electricity price of 0.6 yuan/kWh, this translates to annual electricity cost savings of 94,000 yuan.
For the same volume of masonry, this product is 10% lighter than silicon mullite bricks and 20% lighter than magnesium aluminate spinel bricks. For the same 40-meter masonry section, silicon mullite bricks require 310 tons, while lightweight ultra-low conductivity mullite bricks only require 279 tons, saving 31 tons and reducing procurement costs by approximately 150,000 yuan.
The product’s lightweight design and low thermal conductivity reduce tire wear under pressure, effectively extending the rate of deformation and oxidation of the cylinder under high temperatures, thus extending the service life of the support rollers and the cylinder itself.
Company Profile
About Ruitai Lianxin
Henan Ruitai Lianxin Refractory Materials Co., ltd is a modern R&D-centered refractories manufacturing enterprise integrated with refractories sales and marketing, furnace engineering construction, recycling and sales of waste refractories as well as refractory raw material, technology and goods import and export, and technical services.
Well-equipped and technologically advanced, ISO/QHSE-certified management underpins a product line of ordinary, medium and high-grade magnesia series brick, magnesia-chrome brick, magnesia-alumina spinel brick, magnesia-alumina- chrome basic brick, lightweight brick, clay brick, high alumina brick, corundum brick, zircon series brick, silicon carbide brick and insulation materials, monolithic castable, ramming mix, plastic, etc.
We manufacture more than 70 categories of refractory bricks with more than a thousand specifications and models, which are widely used in high-temperature kiln/furnace, non-ferrous metallurgical smelter, cement lime rotary kiln, glass-melting furnace, electric power, petrochemical hazard waste incinerator etc.
Factory Show
As a 20 refractory bricks manufacturer, we have our own factory, professional machinery and equipments, strong technical team, complete delivery process, perfect after-sales service.
Test Equipment
Ruitai Lianxin has innovative technology and advanced experimental equipment to ensure that every fire brick has the best quality and we are responsible for every customer.
Production Process
We have a complete production process, from raw materials to molding, and then to finished refractory materials. Each step is operated and inspected by dedicated personnel to ensure the high quality of the products.
Raw Materials
Mixing and Tempering
Forming
Drying
Sintering
Selecting
Packing
Shipping
Quality Control
After the refractory bricks are manufactured, we need to undergo professional testing and inspection to ensure that each high-quality refractory brick is delivered to the customer, so that the customer can rest assured.
Packaging & Shipping
Our refractory fire bricks are delivered to customers in the shortest possible time by land, sea or air.
Company Advantages
Customer Cases
As a fire bricks world-renowned exporter, Ruitai Lianxin has expanded our business scope to the world, providing high quality fire bricks to customers worldwide. We have gained loyal customers all over the world, reached cooperation again and again, and become the first choice of global customers.
Company Certification
We are a reliable manufacturer and supplier of refractory bricks, with a number of certificates and patents to protect your kiln, and our professional team of experienced engineers and technicians are committed to providing you with excellent service.
Cooperation Partners
As a refractory fire bricks source manufacturer for 20 years, we use the best materials and the most cutting-edge technology to carefully make firebricks, our fire bricks have all kinds of types to meet various application needs, has won many reliable cooperation partners.
Questions & Answers
Q1: Could I get a sample before placing an order?
A1: Yes. A sample as per your requirement can be prepared for approval.
Q2:How can I get your prompt quotation?
A2:We can give you reply with quotation quickly if you kindly send the inquiry with following factors: dimension (length*width*thickness), service temperature, application and quantity.
We’d be appreciated if you can also provide the density and content.
Q3: Do you have stocks?
A3: Yes, but only for regular size.
Q4: How do you deliver my orders?
A4: Our experts can recommend you the suitable way based on the quantity and your budget. Normally ,it is by sea.
Q5: I am a big buyer, can I get a competitive price?
A5: Yes, you will get our lowest price without quality compromise along with our professional service.As we are working with mainly players in Europe, Asia, America and Afraic.
Q6: What is your quality control?
A6: 1.Chemical inspection is performed during Raw material, production and finished refractory materials.
2.Physical test is performed for finished refractory bricks.
Q7: Are you a refractory fire bricks manufacture or trader?
A7: We are truly a refractory materials manufacturer, Ruitai Lianxin not only can provide the high quality refractory materials with the best price, but also can offer the best pre-sale service and after-service.
Q8: Do you accept size and shape customization? Are the specifications accurate?
A8: Yes! We have a professional R&D team, and advanced QC inspection equipments to ensure the accurate size and shape for you.
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