Refractory materials play an indispensable role in high-temperature industries, such as metallurgy, building materials and chemical industry. Among them, refractory mud and high-temperature cement, as important auxiliary materials, are widely used in the construction of refractory bricks, the repair of furnace lining and the sealing of high-temperature equipment, which provides a strong guarantee for the stable operation of high-temperature equipment.

I. Refractory Mud: Bonding Expert in High Temperature Environment

(1) Definition and use

Refractory mortar, also known as refractory mortar or high temperature mortar, is a kind of bonding material for refractory brick masonry. It is mainly used to fill the gaps between refractory bricks and ensure the close combination between bricks, thus forming an integral refractory structure. The application of refractory mud is very extensive, including the masonry and repair of various high-temperature kilns, furnace linings, flues and other parts.

(2) Performance characteristics

High bond strength: refractory mud has high bond strength, which can ensure that refractory bricks remain stable in high temperature environment and will not loosen due to thermal expansion or mechanical vibration.

Low thermal expansion coefficient: its thermal expansion coefficient is low, which matches the thermal expansion performance of refractory bricks, thus avoiding cracks in brick joints caused by inconsistent thermal expansion.

Good high temperature stability: under high temperature conditions, refractory mud can keep its physical and chemical properties stable, and will not decompose or melt, ensuring the integrity of furnace lining.

Excellent construction performance: the granularity of refractory mud is uniform, which is easy to construct, and can fill brick joints conveniently, and it can be solidified quickly after construction, shortening the construction period.

(3) Technical parameters

The technical parameters of refractory mud vary with types, such as common clay refractory mud and high alumina refractory mud. Taking high alumina refractory mud as an example, the content of alumina (Al₂O₃) in its chemical composition is usually above 45%, and its fire resistance can reach above 1750℃, which has higher bonding strength and better corrosion resistance. Its granularity is generally controlled at -1.0mm, accounting for 100%, the content of +0.5mm is not more than 2%, and the content of -0.074mm is not less than 50%, so as to ensure the convenience of construction and the filling effect of brick joints.

II. high temperature cement: sealing and repair experts under complex working conditions.

(1) Definition and use

High-temperature cement is a kind of material used for sealing and repairing high-temperature equipment, which is usually composed of refractory aggregate, binder and additives. It not only has good bonding performance, but also can maintain sealing performance in high temperature environment to prevent the leakage of high temperature gas or liquid. High-temperature cement is widely used to seal high-temperature furnace doors, furnace covers, pipe joints and other parts, as well as local repair of furnace lining.

(2) Performance characteristics

Excellent high-temperature sealing: High-temperature cement can maintain good sealing performance under high temperature conditions, effectively prevent the leakage of high-temperature medium and ensure the safe operation of equipment.

Good corrosion resistance: it has high chemical stability, can resist the corrosion of high-temperature gas and slag, and prolong the service life of the equipment.

Rapid curing: High-temperature cement has the characteristics of rapid curing, which can form a solid sealing layer in a short time and reduce the downtime of equipment.

Convenient construction: it has excellent construction performance, can be constructed by daubing and filling, and is suitable for various complex equipment surfaces.

(3) Technical parameters

The technical parameters of high temperature cement are also different due to application scenarios and specific requirements. For example, the mastic used for sealing high-temperature furnace doors has a fire resistance of above 1500℃ and a high bonding strength, which can keep the sealing performance during frequent switching operations; However, the cement used for lining repair needs higher corrosion resistance and high temperature stability, and its chemical composition and fire resistance will be adjusted according to the specific requirements of the repair site.

III. Application Examples of Refractory Mud and High Temperature Plaster

(1) Kiln masonry

In the process of building ceramic kiln, refractory mud is an indispensable material. The construction workers laid the firebricks according to the design requirements, and filled the brick joints with refractory mud. The high bond strength and good construction performance of refractory mud ensure the close combination between bricks and form a solid kiln structure. In the process of kiln operation, refractory mud can withstand high temperature and mechanical stress, prevent cracks in brick joints and prolong the service life of kiln.

(2) Repair of furnace lining

For some large industrial furnaces, such as steelmaking furnaces and glass melting furnaces, local damage of furnace lining is a common problem. At this time, high temperature cement can play an important role. After the construction workers clean up the damaged parts, they use high-temperature cement to repair them. High-temperature cement can quickly solidify and closely combine with the original lining material to form a solid repair layer. Its good corrosion resistance and high temperature stability ensure that the repaired lining can continue to withstand the test of high temperature environment and restore the normal operation of the equipment.

(3) Sealing of high-temperature equipment

In the high temperature pipeline system of chemical industry, the sealing of pipeline interface is a key problem. High-temperature cement can be used to seal pipeline joints to prevent the leakage of high-temperature gas or liquid. The constructors evenly daub the high-temperature cement on the joint, and form a sealing layer after curing. Because of its excellent high-temperature sealing performance and good corrosion resistance, high-temperature cement can effectively prevent the leakage of media and ensure the safe operation of pipeline system even under complex working conditions of high temperature and high pressure.

IV. Key points for purchasing refractory mud and high-temperature cement

(1) Select appropriate materials according to working conditions.

Different high-temperature equipment and working conditions have different requirements for refractory mud and high-temperature cement. For example, for ordinary ceramic kilns, ordinary clay refractory mud can meet the demand; For high temperature and high erosivity steelmaking furnace, it is necessary to choose high alumina refractory mud or high performance high temperature cement. When purchasing, we should choose the appropriate material type and performance index according to the factors such as the service temperature, medium properties and mechanical stress of the equipment.

(2) Pay attention to product quality and standards.

The quality of refractory mud and high temperature cement directly affects the operation effect and service life of equipment. When purchasing, you should choose products that meet national standards or industry standards, such as KS, JIS, ASTM and other standards. At the same time, we should pay attention to whether the technical parameters such as chemical composition, refractoriness, bonding strength and granularity of the product meet the requirements, so as to avoid equipment failure caused by product quality problems.

(3) Consider the reputation and service of suppliers.

Choosing suppliers with good reputation and rich experience is an important guarantee to ensure product quality. Suppliers should have a sound quality control system and be able to provide authoritative test reports and product certification documents. In addition, good after-sales service is also very important, including technical support, construction guidance and quality tracking. When problems occur, suppliers can respond in time and provide solutions to protect the interests of users.

V. Development trend of refractory mud and high temperature cement

With the continuous development of high-temperature industry, the performance requirements of refractory mud and high-temperature cement are getting higher and higher. In the future, the development of refractory clay and high temperature cement will show the following trends:

High performance: research and develop refractory clay and high-temperature cement with higher refractoriness, stronger bonding strength and lower thermal expansion coefficient to meet the needs of complex working conditions such as extreme high temperature and high corrosiveness.

Environmental protection: develop non-toxic, pollution-free, low-energy refractory mud and high-temperature cement to reduce the impact on the environment and meet the requirements of sustainable development.

Multifunctional: In addition to the basic bonding and sealing functions, refractory mud and high-temperature cement will also have the functions of heat insulation, heat preservation and thermal shock resistance, so as to improve the comprehensive performance of the equipment.

Convenient construction: develop refractory mud and high-temperature cement with easy construction, fast curing speed and low requirements for construction environment, improve construction efficiency and shorten equipment downtime.

VI. Conclusion

As important auxiliary materials in high-temperature industry, refractory mud and high-temperature cement play a vital role, although they are different in product form and specific application. They not only ensure the stable operation of high-temperature equipment, but also prolong the service life of the equipment and reduce the production cost. With the continuous progress of technology, the performance of refractory mortar and high-temperature cement will be continuously improved, and the application scope will be further expanded, providing a more reliable guarantee for the development of high-temperature industry.