Industry Knowledge of Ordinary Fireclay Refractory Brick

Ordinary fireclay refractory brick is a kind of refractory brick that is widely used in various high-temperature industries. It is made of high-quality raw materials, processed through strict technological processes, and has excellent resistance to high temperature, corrosion, and thermal shock. In this article, we will discuss the classification, technical parameters, and production process of ordinary fireclay refractory bricks.

According to the national standard GB/T 34188-2017, ordinary fireclay refractory bricks are divided into three grades: grade I, grade II, and grade III.
Grade I Ordinary Fireclay Refractory Brick: The refractoriness of grade I ordinary fireclay refractory brick is above 1770°C, and the load softening temperature is no less than 1350°C.
Grade II Ordinary Fireclay Refractory Brick: The refractoriness of grade II ordinary fireclay refractory brick is above 1730°C, and the load softening temperature is no less than 1300°C.
Grade III Ordinary Fireclay Refractory Brick: The refractoriness of grade III ordinary fireclay refractory brick is above 1690°C, and the load softening temperature is no less than 1250°C.

1. Refractoriness: Refractoriness is one of the essential performance indicators of ordinary fireclay refractory bricks. The higher the refractoriness, the better the resistance to high temperature.
2. Load Softening Temperature: Load softening temperature is an essential indicator of the ability of refractory bricks to withstand load and deformation under high temperature. The higher the load softening temperature, the stronger its ability to withstand deformation under high temperature.
3. Thermal Shock Resistance: The thermal shock resistance of ordinary fireclay refractory bricks refers to the ability to withstand rapid changes in temperature without cracking or spalling. It is an important performance indicator of refractory bricks in high-temperature working environments.

The production process of ordinary fireclay refractory bricks can be divided into four steps: raw material preparation, molding, drying, and firing.
1. Raw Material Preparation: The first step is to prepare raw materials. The raw materials required for making ordinary fireclay refractory bricks include clay, kaolin, high alumina bauxite, and other auxiliary materials. These materials need to be properly mixed and crushed before molding.
2. Molding: After the raw materials are prepared, they are molded into a specific shape. The molding process typically includes pressing, extruding, or casting.
3. Drying: The molded refractory bricks need to be dried before firing. Drying is a critical step in the production process and must be carried out carefully to avoid cracking or deformation of the refractory bricks.
4. Firing: Firing is the final step in the production process of ordinary fireclay refractory bricks. The purpose of firing is to improve the strength and performance of the refractory bricks. The firing temperature and time are critical factors that affect the quality of the refractory bricks.

In summary, ordinary fireclay refractory bricks are an essential material in various high-temperature industries. They have excellent resistance to high temperature, corrosion, and thermal shock. The classification, technical parameters, and production process of ordinary fireclay refractory bricks must be strictly followed to ensure their quality and service life.