How many types of refractories are there?

Blog

1. Classification by chemical properties

Acidic refractory: usually refers to refractory with SiO2 content greater than 93%. Its main feature is that it can resist the erosion of acidic slag at high temperature, but it is easy to react with alkaline slag.
Alkaline refractory: generally refers to refractory with magnesium oxide as the main component. This type of refractory has high refractoriness and strong ability to resist alkaline slag.
Neutral refractory: refers to refractory with SiO2-Al2O3 as the main component.

2. Classification by main mineral chemical components

Silica refractory: with silica as the main raw material, containing a high SiO2 component.
Aluminosilicate refractory: contains Al2O3 and SiO2.
Magnesium refractory: with magnesium oxide as the main component.
Magnesium spinel refractory: contains magnesium and spinel components.
Magnesium chromium refractory: contains magnesium and chromium and other components.
Magnesium dolomite refractory: mainly composed of magnesium and dolomite components.
Dolomite refractory: dolomite is the main raw material.
Carbon composite refractory: contains carbon components and other substances.
High alumina refractory: high Al2O3 content.
Chromium refractory: contains chromium.
Zirconium refractory: the main component contains zirconium.

3. Classification by supply form

Shaped refractory: such as refractory bricks of various shapes, which are refractory finished products whose shapes are determined and cannot be changed after the raw materials are formed by pressing process, high temperature firing or non-firing drying. For example, wear-resistant chrome corundum composite bricks, corundum bricks, phosphate bricks, etc.
Unshaped refractory: including refractory castables, refractory ramming materials, refractory spray coatings, etc. For example, amorphous plastics prepared by granular and powdery materials, combined with plastic clay and other binders and appropriate plasticizers; amorphous castables mixed with refractory aggregates and powders, binders, and admixtures with a certain particle size distribution, etc.

$types of refractories$

types of refractories

4. Classification according to different refractories

Ordinary refractory materials: temperature resistance 1580 – 1770℃.
High-grade refractory materials: can withstand high temperatures of 1770 – 2000℃.
Special refractory materials: high temperature resistance 2000 – 3000℃.
Super refractory materials: above 3000℃.

5. Classification according to volume density

6. Classification according to different properties and sizes

Standard refractory materials: have standard shapes and sizes.
General refractory materials: shapes and sizes are relatively common.
Special refractory materials: shapes are different from standard shapes and have special shape requirements.
Special refractory materials: refractory materials with very special and complex shapes, etc.

7. Classification according to molding process

Natural rock processing molding: refractory materials made by processing natural rocks.
Pressure-molded refractory materials: refractory materials molded by pressing process.
Casting refractory: Made by casting process.
Plastic forming refractory: Made by the plasticity of the material.
Ramming forming refractory: Made by ramming process.
Spray forming refractory: Made by spraying.
Extrusion forming refractory: Refractory formed by extrusion process.

8. Classification by heat treatment method

Burned brick: Brick refractory that has been fired.
Unburned brick: Brick refractory that does not need to be fired.
Amorphous refractory: Refractory that has not been subjected to specific heat treatment such as firing.
Molten (cast) products: Refractory products made by melting or casting.

9. Classification by use

Refractory for steel industry: Used in steel production related equipment such as blast furnace, converter, electric furnace, ladle furnace, LF furnace, RH furnace and continuous casting system.
Refractory for non-ferrous metal industry: Used in furnaces and kilns for non-ferrous metal smelting.
Refractory for petrochemical industry: Used in related high-temperature equipment in petrochemical industry.
Refractory materials for silicate industry: used in glass kilns, cement kilns, ceramic kilns and other equipment.
Refractory materials for power industry (power boiler): used in power equipment such as power boilers.
Refractory materials for waste incineration melting furnace: used in waste incineration melting furnace.
Refractory materials for other industries: used in other industries that require refractory materials.