What is amorphous refractory material?

Unshaped refractory materials refer to refractory materials composed of refractory aggregates (aggregates and powders) with a certain particle size distribution, binders and admixtures in a wet or semi wet or dry state, which can be directly used to construct or repair industrial kiln linings. This type of material can be used to construct a seamless overall lining.

Compared with fired refractory products, amorphous refractory materials have the following characteristics: (1) simple preparation process, short production cycle, and high labor productivity; (2) Strong adaptability, not limited by the shape of industrial kiln structure during use, can be made into any shape; (3) Good overall integrity, good airtightness, high thermal resistance, can reduce industrial furnace heat loss and save energy; (4) Convenient for mechanized construction, saving labor and time; (5) For damaged industrial furnace linings, it is easy to repair them with amorphous refractory materials, extending the service life of the lining and reducing refractory material consumption. Therefore, amorphous refractory materials have gradually replaced most fired refractory products and have been widely used,

The proportion of amorphous refractory materials used in the metallurgical industry is high.


According to the classification of construction technology, amorphous refractory materials can be divided into the following seven categories: cast refractory materials, plastic refractory materials, sprayed refractory materials, coated (covered) refractory materials, extruded (pressed) refractory materials, projected refractory materials, dry vibration (or filling) refractory materials, etc.

The preparation process of amorphous refractory materials, including material selection, determination of particle size distribution, selection of binders and admixtures, and determination of processing flow, is determined based on the usage conditions and environment, as well as the construction method used.

The granular raw materials used to prepare amorphous refractory materials are collectively referred to as refractory aggregates. Refractory aggregates are divided into aggregates and powders. Aggregates with particle sizes greater than 0.088mm (or 0.074mm) are called aggregates and play a skeleton role in amorphous refractory materials. Aggregates with particles smaller than 0.088mm (or 0.074mm) are called powder, and are also called matrix due to their role in embedding aggregates or filling gaps between aggregate particles, where 0.088mm to l0 μ M is called fine powder, less than 10 μ M is called ultrafine powder (or micro powder). We can use Andressn or Dinger funk particle size distribution equations to determine particle size distribution. In this process, the main focus is on controlling the particle size distribution coefficient q value, which is determined based on the operational and physical performance requirements of the material.

The substance that binds the aggregate of dispersed refractory materials composed of refractory aggregate and powder together is called a binder (also known as a binder). As a binder for amorphous refractory materials, it not only requires good cold and hot bonding strength, but also suitable operational performance (construction performance) and high-temperature performance.

The types of binders used for amorphous refractory materials vary depending on the properties and usage conditions of the bonded material, and are generally classified according to the chemical properties and hardening conditions of the binders.

According to the chemical properties of binders, there are inorganic binders and organic binders.