Basic Knowledge of Refractory Materials from Refractory Manufacturer

By definition, refractory materials refer to inorganic non-metallic materials with refractoriness not less than 1580°C. Although different countries have different definitions, refractories need to be able to accept corresponding physical and chemical changes and mechanical effects because they are used as structural materials for high-temperature kilns, furnaces, and other thermal equipment, as well as industrial high-temperature containers and parts.

Types of Refractory Materials

Most refractory materials are made of natural minerals (such as refractory clay, silica, magnesite, dolomite, etc.) as raw materials. Now, the use of certain industrial raw materials and artificial composition raw materials (such as industrial alumina, silicon carbide, composition mullite, composition spinel, etc.) is also increasing.

Selection Principle of Refractory Materials for Furnace Construction

Furnace construction materials mainly include refractory materials, heat insulation materials, steel, wood, cement, and other general building materials and other auxiliary materials. Grasp the difference in variety, specifications, and performance of various refractory materials, choose rationally and use various materials correctly. In the masonry process of refractory materials, strengthening the scientific management of materials and reducing the loss of materials are the main prerequisites for ensuring the quality of industrial furnace masonry engineering and improving the service life of the furnace.

The General Principles for Selecting Furnace Materials are as Follows.

(1) The material must have technical performance that can meet the requirements of industrial furnaces. Its performance indicators should meet the current national standards or design requirements.

(2) The selected materials must have good construction performance and can meet the technical requirements of construction and the requirements of project quality.

(3) The materials used must comply with the national laws, regulations, and technical specifications on labor protection and environmental protection.

Classification of refractory materials

(1) Classified by chemical characteristics

Acid refractory material. Acidic refractories are refractories with silica as the main component, mainly referring to silica bricks and zircon bricks. Acidic refractories are resistant to acid slag erosion.

Neutral refractory material. Neutral refractories mainly refer to refractories with aluminum oxide, chromium oxide, silicon carbide, and carbon as the main components. Such as corundum bricks, high alumina bricks, silicon carbide bricks, silicon nitride bricks, carbon bricks, etc. Its characteristic is that it has corrosion resistance to both acidic slag and alkaline slag.

Alkaline refractories. Alkaline refractories mainly refer to refractories with magnesium oxide and calcium oxide as the main components. Including magnesia bricks, magnesia alumina bricks, magnesia chrome bricks, dolomite bricks, etc. Alkaline refractories have strong corrosion resistance to alkaline slag.

(2) Classified by chemical mineral composition

• ①Silicone refractory

• ②Aluminosilicate refractories

• ③Magnesia refractory material

• ④Dolomite products

• ⑤Chrome products

• ⑥Carbon products

• ⑦Zirconium products

• ⑧Special products

(3) According to the refractoriness

According to the refractoriness, it can be divided into general refractory products (1580-1770°C), advanced refractory products (1770-2000°C), and special grade refractory products (above 2000°C).

(4) Classified by shape and size

According to the shape and size, it can be divided into standard bricks, special-shaped bricks, special-shaped bricks, large special-shaped bricks, etc.

(5) Classified by the molding process

• Natural rocks;

• Mud casting molding refractories;

• Moldable refractory materials;

• Semi-dry formed refractory materials;

• Ramming (including mechanical ramming and manual ramming) shaped refractory materials;

(6) Casting products.

In addition, refractories can also be classified into refractories for blast furnaces, refractories for converters, refractories for continuous casting, refractories for glass kilns, refractories for cement kilns, and so on.

Based on the above description, I believe you have a certain understanding of refractory materials products. Rongsheng refractories manufacturers have rich experience in the production and sales of refractories. He has his own unique knowledge about the formula and production process of various refractory products. Rongsheng refractory manufacturers not only provide customers with standard refractory products but also provide customers with customized refractory linings. In view of the problems faced by different furnace refractory linings, Rongsheng refractory manufacturers will provide the best solutions according to production needs. To learn more about refractory products and information, please continue to follow our blog.