In modern industrial production, the stable operation of high-temperature equipment is inseparable from high-quality refractories. As a refractory with excellent performance, low porosity clay brick plays an indispensable role in many industrial fields with its unique physical and chemical characteristics. This paper will introduce the characteristics, production process, application scope and quality control of low porosity clay brick in detail to help readers fully understand this important material.

I. Characteristics of clay brick with low porosity

Low porosity clay brick is a kind of high performance refractory, and its main features are as follows:

Low porosity and high bulk density: the porosity of low porosity clay brick is extremely low, usually between 10% and 15%, or even lower. This low porosity structure makes the brick have a very high bulk density, usually between 2.30 and 2.40 g/cm. Low porosity and high bulk density endow the brick with excellent corrosion resistance and high strength.

High cold compressive strength: Low porosity clay brick has very high cold compressive strength and can withstand huge mechanical pressure. Its cold compressive strength is usually between 58.8 MPa and 80 MPa, which makes the brick still maintain structural stability in high temperature environment.

High load softening temperature: The load softening temperature of clay bricks with low porosity is extremely high, usually between 1470 and 1550 C. This means that the brick can keep its shape and performance for a long time in high temperature environment, and will not be deformed or softened due to high temperature.

Good corrosion resistance: due to its low porosity and high density structure, low porosity clay brick has strong resistance to the corrosion of various chemicals. No matter whether it is acidic, alkaline or neutral, it can not easily corrode the brick body, thus prolonging the service life of the brick body.

II. Production process of low porosity clay brick

The production process of low porosity clay brick is strict and fine, which mainly includes the following steps:

Selection of raw materials: The main raw materials of low porosity clay brick are flint clay calcined at ultra-high temperature and calcined bauxite. These raw materials are strictly screened to ensure that their chemical composition meets the requirements, especially the content of aluminum oxide (Al₂O₃) is usually between 42% and 45%, and the content of iron oxide (Fe₂O₃) is controlled between 1.00% and 1.50%.

Mixing and molding: the screened raw materials are mixed in a certain proportion and then molded by high-pressure molding equipment. High pressure forming can ensure the density and uniformity of brick, and lay a good foundation for subsequent high temperature sintering.

High-temperature sintering: the formed brick needs to be sintered in a high-temperature furnace. The sintering temperature is usually above 1400 C. After a long period of high-temperature sintering, the porosity of the brick is further reduced, and the bulk density and strength are significantly improved.

Quality inspection: After sintering, every brick needs to undergo strict quality inspection. The inspection items include chemical composition analysis, physical performance test (such as porosity, bulk density, cold compressive strength, etc.) and appearance inspection. Only bricks that fully meet the quality standards can leave the factory.

III. Application scope of low porosity clay brick

Low porosity clay brick has been widely used in many industrial fields because of its excellent performance:

Metallurgical industry: In ironmaking blast furnace, metal mixer, hot metal mixer and other equipment, low porosity clay brick can withstand high temperature and chemical erosion, ensuring the stable operation of equipment.

Glass industry: the lining material of glass melting furnace needs to have good corrosion resistance and high temperature stability. Low porosity clay brick is an ideal lining material, which can effectively prolong the service life of furnace.

Petrochemical industry: In high-temperature equipment such as petroleum cracking furnace and chemical reaction furnace, clay brick with low porosity can withstand the corrosion of high temperature and chemical substances to ensure the safe operation of the equipment.

Building materials industry: in cement rotary kiln, ceramic firing kiln and other equipment, low porosity clay brick can effectively resist high temperature and chemical erosion, and improve the production efficiency and service life of equipment.

Other fields: Low porosity clay bricks are also widely used in mechanical processing, military industry and other fields that need high-temperature equipment.

IV. Quality Control and After-sales Service

The quality control of low porosity clay brick is very important. In the production process, enterprises usually establish a perfect quality control system, from raw material procurement to finished products leaving the factory, every link must undergo strict quality inspection. Professional quality inspectors will sample the products to ensure that each brick meets the quality standards. Unqualified products are not allowed to leave the factory.

In order to better serve customers, enterprises will also provide comprehensive after-sales service. This includes providing authoritative inspection reports of products, construction plans, and instructions on how to use them. If customers encounter quality problems in the use process, the enterprise will negotiate with customers to solve them and make compensation according to the actual situation.

V. Summary

As a kind of high-performance refractory, low porosity clay brick has been widely used in many industrial fields because of its low porosity, high bulk density, high cold compressive strength, high load softening temperature and good corrosion resistance. Its strict production process and quality control system ensure the high quality and stability of products. With the continuous development of industrial technology, low porosity clay brick will continue to provide a solid guarantee for the stable operation of high temperature equipment.