In the process of daily technical docking, customer consultation and kiln maintenance, we have collected a large number of common questions about clay bricks that users are concerned about. Most purchasing and construction personnel have questions about the temperature parameters, adaptable working conditions, service life, and selection differences of clay bricks. This article compiles 10 frequently asked questions about clay bricks in the industry and provides unified answers using factory practical experience to help everyone thoroughly understand the key points of clay brick selection and use.

The main crystal phase of mullite bricks is mullite (3Al₂O₃·2SiO₂). However, ordinary high alumina bricks only have alumina content that meets the standard, and their crystal phase is usually composed of a mixture of corundum, mullite and glass. In actual use, mullite bricks have significant advantages in thermal shock resistance and creep resistance. They have better volume stability under high temperature environments and are less prone to deformation and cracking problems.

After working in the high-temperature kiln industry for more than ten years, I have observed one thing: when many purchasing and technical personnel select integrated furnace bricks, the first thing they are most accustomed to asking is - 'What is the content of aluminum oxide (Al₂O₃)?' 68%, 75%, 80%...the higher the number, the more secure it seems. But to be honest, choosing a brick based on its Al₂O₃ content is like buying a car based only on its engine displacement. Large displacement does not necessarily mean stable running, and high content does not necessarily mean durability. Today we will talk about, in addition to the composition report, when choosing integrated furnace bricks in 2026, you should also look at several more critical indicators.

In the new dry cement production process, the rotary kiln is the core thermal equipment, and the transition zone of the rotary kiln in the cement industry is located between the firing zone and the decomposition zone, with a temperature range of approximately 1100°C-1300°C. This area not only bears high-temperature thermal stress, but also faces chemical erosion from volatile components such as alkali, sulfur, and chlorine, as well as mechanical stress caused by cylinder deformation. With the popularization of collaborative disposal of waste (such as domestic waste, hazardous waste, tires, etc.) in the cement industry, the working conditions in the transition zone have become increasingly harsh, alkali-sulfur corrosion has intensified, and the life of traditional refractory materials has been significantly shortened. Therefore, the selection and matching of refractory materials in the transition zone of rotary kilns in the cement industry has become a key link affecting the kiln operation rate and overall cost. Refractory materials used in the transition zone of rotary kilns in the cement industry generally face three core pain points: First, alkali-sulfur corrosion causes structural spalling.  2. Compound damage caused by thermal shock and mechanical stress.  Third, the kiln skin hanging ability is weak and the kiln skin is unstable.  These three pain points overlap each other, making the transition zone of the rotary kiln in the cement industry the 'short board' in the life of the entire rotary kiln, seriously restricting the continuous operation cycle of the production line. In response to the above pain points, Shengyuan Refractories launched a special magnesia-chrome brick solution for the transition zone of rotary kilns in the cement industry, providing full-stack support around material formula optimization, structural design and construction support. If you are facing problems such as short service life of the transition zone, frequent red kiln occurrences,

In the final analysis, the selection of lining materials for copper smelting furnaces is to withstand high temperatures, resist slag erosion, and withstand the thermal shock caused by frequent temperature fluctuations. Magnesia-chromium bricks not only have excellent high temperature and pressure resistance, but also have outstanding slag corrosion resistance. They also have excellent thermal stability. With multiple advantages, they have naturally become the mainstream material for flash furnaces and reverberatory furnace linings.

This article combines 2026 industry standards and practical application experience to sort out the key points of the entire process of high alumina brick selection to help you accurately avoid pitfalls and choose the right product. Combined with the needs of different working conditions, accurate high alumina brick selection recommendations are given, taking into account performance and cost, and adapting to various industrial scenarios. 1. General scenarios for medium and low temperatures (≤1200°C, low erosion): Priority is given to three-level ordinary sintered high-alumina bricks, which have outstanding cost performance and are suitable for hot blast stoves, chimney linings, and low-temperature sections of kilns to reduce procurement costs. 2. Medium-temperature conventional scenarios (1200-1400°C, large temperature fluctuations): Second-level ordinary sintered high-alumina bricks are recommended, with balanced performance and good thermal shock resistance. They are suitable for conventional working conditions such as ceramic kilns, cement rotary kilns, preheating zones, and cooling zones. 3. Medium-high temperature and high erosion scenarios (1300-1500°C, slag/flue gas erosion): Use low-pore high-alumina bricks, which have strong corrosion resistance and erosion resistance. They are suitable for core parts such as glass melting furnaces and blast furnaces to reduce the frequency of replacement. 4. Medium-temperature and high-wear scenarios (≤1300°C, acidic environment): Use phosphoric acid-bonded high-aluminum bricks, which are resistant to peeling and wear. They are suitable for chemical reactors and electric furnace tops, taking into account both construction efficiency and use effects. 5. Key high-temperature scenarios (≥1400℃): Use first-grade sintered high-alumina bricks with Al₂O₃ content ≥75%, high temperature resistance and high strength, suitable for boiler main furnaces and steel smelting core linings.