Industry Knowledge of Vermiculite Refractory Brick

Vermiculite refractory brick, also known as vermiculite insulating brick, is a type of lightweight refractory material widely used in thermal insulation, high-temperature furnace construction, and other industrial applications. With high thermal stability, excellent thermal insulation, and low thermal conductivity, vermiculite refractory brick has become a popular choice in various industries.

Vermiculite refractory brick can be classified into different grades based on their composition and properties, such as:
1. General Grade Vermiculite Refractory Brick: this type of brick is made from vermiculite ore, and it has a low content of impurities. It has good thermal insulation properties, but it is not suitable for use in high-temperature environments.
2. High-grade Vermiculite Refractory Brick: this type of brick is made from pure vermiculite ore, and it has a low thermal conductivity, high thermal stability, and excellent insulation properties. It is suitable for use in high-temperature furnaces and kilns.
3. Low-iron Vermiculite Refractory Brick: this type of brick is made from vermiculite ore with low iron content, and it is suitable for use in applications where iron contamination is a concern.

The technical parameters of vermiculite refractory brick include:
1. Thermal Conductivity: the thermal conductivity of vermiculite refractory brick is low, ranging from 0.14 to 0.20 W/m·K, which makes it an excellent insulator.
2. Compressive Strength: the compressive strength of vermiculite refractory brick is between 5 MPa and 20 MPa, depending on the grade of the brick.
3. Heat Resistance: vermiculite refractory brick has a high heat resistance, with a maximum service temperature of 1300°C.

The production process of vermiculite refractory brick involves the following steps:
1. Raw Material Preparation: the vermiculite ore is crushed into small particles and screened to remove impurities.
2. Mixing: the vermiculite particles are mixed with binders and additives to form a clay-like mixture.
3. Molding: the mixture is molded into the desired shape using a press or extruder.
4. Drying: the molded bricks are dried in a kiln to remove excess moisture.
5. Firing: the dried bricks are fired in a high-temperature kiln to sinter the vermiculite particles and produce the final product.

In conclusion, vermiculite refractory brick is an important material in the industrial sector due to its excellent thermal insulation and other properties. Its classification, technical parameters, and production process illustrate its versatility and usefulness as a refractory material. The industry continues to see growth in demand for this material, fueling further advances in technology and production processes.