Characteristics and application of monolithic refractories

      Unshaped refractories are refractory materials with no fixed shape, usually in the form of powder, slurry or paste, and can be constructed by pouring, spraying, scraping, etc., and can adapt to the structural requirements of various complex shapes and local details. The following is an introduction to the characteristics and applications of monolithic refractory materials.

A. Characteristics of monolithic refractories
     1. Irregular shape: The shape of amorphous refractory materials is usually bulk or shaped blocks, which is more difficult to stack and fix than regular refractory materials.
     2. Good high temperature resistance: monolithic refractories have excellent high temperature resistance, and can usually withstand high temperature environments exceeding 1500 °C. It can maintain stable physical and chemical properties in a high temperature environment, and is not easy to melt and flow.
     3. Good wear resistance: monolithic refractories have strong wear resistance and can be used in working environments that are often subject to wear and friction.
     4. Good impact resistance: monolithic refractories have good impact resistance and can withstand certain mechanical vibrations and impacts.
     5. Convenient construction: Monolithic refractory materials are usually self-flowing or spraying, which is convenient for construction and can be adjusted and adapted according to needs.

B. The main application of monolithic refractories
      1. Iron and steel metallurgy industry: In the iron and steel metallurgy industry, monolithic refractories are mainly used for lining and repairing of high-temperature equipment such as blast furnaces, converters, electric arc furnaces, and foundry equipment, as well as kilns such as coke ovens, hot blast stoves, and gas generators. protection of.
      2. Cement industry: In the cement industry, monolithic refractory materials are mainly used for maintenance and repair of high-temperature parts such as kiln head, kiln tail, kiln shell, and kiln chamber. It can also be used for the protection and anticorrosion of the back section of cement kiln, cyclone, flue and other parts.
      3. Chemical industry: In the chemical industry, monolithic refractories are mainly used for lining and repairing of high-temperature equipment such as petroleum cracking furnaces, coal-to-gas furnaces, ethylene furnaces, and methanol furnaces, as well as various reaction kettles, storage tanks, and pipelines Protection of other parts.
      4. Heat treatment industry: In the heat treatment industry, monolithic refractory materials are mainly used for lining and repairing of various furnaces, furnaces, heating furnaces and other equipment, as well as protection of carburizing furnaces, quenching furnaces, annealing furnaces and other parts.
      5. Other industries: Unshaped refractories can also be used for maintenance and repair of high-temperature equipment and furnaces in industries such as electric power, metallurgy, glass, and ceramics.

C. Common unshaped refractories
      1. Castables: Castables are mainly made of powders such as alumina, silicate and silicon carbide, and are suitable for linings and insulation layers of various large structural parts and special-shaped parts.
      2. Spray coating: Spray coating is mainly composed of alumina, silicate, calcium silicate, etc., and is suitable for coating on large-area curved or irregular surfaces for thermal insulation and heat insulation.
      3. Scratch paint: Scratch paint is mainly made of alumina, silicate, calcium silicate and other materials, and is suitable for large-area architectural decoration and maintenance paint.
It should be noted that monolithic refractory materials also have some disadvantages, such as low density, susceptibility to environmental humidity, and problems such as the need to pay attention to the proportion of mixes during construction, so they need to be evaluated and selected according to specific conditions when using them.