Clay bricks are divided by use and are mainly divided into clay refractory bricks for blast furnaces, clay refractory bricks for hot blast furnaces, and large clay refractory bricks for coke ovens and glass kilns.
Fire clay brick is a common refractory material used in construction and industrial applications in high temperature environments. Fire Clay bricks are made of kaolin (fire clay) and other refractory materials, which are formed, dried and sintered at high temperature. The main component of fire clay bricks is kaolin, which is a clay ore containing aluminum and silicon. Kaolin has excellent fire resistance and chemical stability, and can resist chemical attack at high temperature. In addition, other refractory materials such as quartz, gypsum, silica sand, etc. may be added to the fire brick to enhance its performance.
| Item/Grade | PN-42 | PN-40 | PN-35 | PN-30 | PN-25 | |
|---|---|---|---|---|---|---|
| ω (Al2O3)/% | μ0 ≥ | 42 | 40 | 35 | 30 | 25 |
| σ | 2.5 | |||||
| ω (Fe2O3)/% | μ0 ≤ | 2.0 | / | / | / | / |
| σ | 0.4 | |||||
| Apparent Porosity/% | μ0 ≤ | 20 (22) | 24 (26) | 26 (28) | 23 (25) | 21 (23) |
| σ | 2.0 | |||||
| Cold Crushing Strength/MPa | μ0 ≥ | 45 (35) | 35 (30) | 30 (25) | 30 (25) | 30 (25) |
| Xmin | 35 (25) | 25 (20) | 20 (15) | 20 (15) | 20 (15) | |
| σ | 10 | |||||
| 0.2MPa Refractoriness Underload T0.6/℃ | μ0 ≥ | 1400 | 1350 | 1320 | 1300 | 1250 |
| σ | 13 | |||||
| Permanent Linear Change/% | U-L | 1400℃*2h -0.4-0.1 | 1350℃*2h -0.4-0.1 | 1300℃*2h -0.4-0.1 | 1300℃*2h -0.4-0.1 | 1250℃*2h -0.4-0.1 |
The refractoriness of fire clay bricks is comparable to that of silica bricks, as high as 1690~1730°C. Fire clay bricks have excellent refractory properties and can withstand thermal stress and thermal shock in high temperature environments.
Fire clay bricks have good thermal insulation performance and can effectively prevent heat conduction. This helps maintain a comfortable temperature inside the building and reduces reliance on heating and cooling systems, thereby saving energy and reducing energy costs.
Fire clay refractory bricks have good thermal stability so that they can maintain the stability of the structure under the condition of rapid cooling or heating at high temperature, and reduce the influence of thermal stress on the material.
Fire clay brick can withstand the erosion of corrosive substances such as acid and alkali, and are not easy to be eroded, dissolved or corroded, and are suitable for environments and processes that require chemical corrosion resistance.
Kerui Group has a number of international certifications, such as, ISO9001/ISO14001/OHSAS18001/CE/SGS. Besides, Kerui’s products also have many domestic certificates, the quality is very guaranteed, and they have been unanimously recognized by customers at home and abroad.
Fire clat brick can be widely used in iron ladles (such as clay bricks, universal arc bricks), taphole heat (such as sleeve bricks), hot blast furnace regenerators (such as clay checker bricks), and kiln flues (sometimes customers also call them Acid-resistant bricks), etc.
Clay bricks are widely used in kilns in the building materials industry, such as kaolin tunnel kilns, ceramsite rotary kilns and other dense kilns that do not require high firing temperatures, especially lime shafts, which are generally used in non-critical parts.
In the glass industry, for the lower grate and lower checker bricks of the glass melting furnace regenerator, if the temperature requirements are not too high, fire clay bricks can be used, which are generally professionally called BN-40a and BN-40b.
In coke ovens, generally, fire clay bricks are often used in parts of coke ovens where the temperature is low and fluctuates greatly, such as furnace doors, riser lining bricks, small flue lining bricks, furnace tops, regenerator sealing walls, and checker bricks.
Carbon roasting furnaces and graphitization furnaces do not have very high temperature requirements, but require low creep and density. Most of the entire set of materials are clay bricks, but most of them are low-creep clay bricks or dense clay bricks, such as ZN -45 etc.
Clay bricks for blast furnaces are made of refractory clay and are used to build blast furnace linings. Mainly used in the throat, furnace body, hearth, furnace bottom of small blast furnaces and large blast furnace bodies. In Chinese metallurgical standards, it is divided into ZGN-42 and GN-42.
The entire delivery process is tracked, and Kerui’s expert team solves specific project needs with the utmost professionalism. If the customer’s project requires it, Kerui’s expert team will go to the customer’s country to provide face-to-face technical support.
Besides mainland China, Kerui Refractory has exported products to more than 50 countries and regions across 5 continents across the world, including Asia, Europe, America, Africa and Oceania. We have received recognition and high praise from customers all over the world, and are constantly receiving customers’ return orders and referrals.