Refractory bricks are shaped products of refractory materials. The main component is composed of chemical minerals. The following classification methods can directly characterize the basic composition and characteristics of various refractory materials. They are common classification methods in production, use and scientific research. Strong practical application significance.

(1) Magnesium refractory

Magnesium refractories refer to alkaline refractory materials with magnesite as the main raw material, periclase as the main crystalline phase and MgO content greater than 80%. Magnesium products: MgO content ≥87%, the main mineral is periclase; Magnesium-aluminum products: containing MgO> 75%, AI₂O₃ content is generally 7-8%, the main minerals become periclase and magnesite spinel (MgAl₂O₄); Magnesium chromium products: MgO> 60%, Cr₂O₃ content is generally below 20%, the main mineral components are periclase and chromium spinel ;.

Forsterite and magnesia products: Main component: MgO, the second chemical component is SiO₂. Forsterite bricks contain more SiO₂ than magnesia bricks. The main mineral component of the former is forsterite, followed by periclase; the main mineral of the latter is periclase, followed by forsterite;

Magnesia-calcium products: This magnesium material contains a certain amount of Ca0, and the main mineral component contains a certain amount of dicalcium silicate (2CaO· SiO₂) in addition to periclase.

(2) Aluminum silicate

Aluminum silicate refractory is composed of Al₂O₃ and SiO₂ and a small amount of impurities. According to its different Al₂O₃ content, it can be divided into: 1. Semi-silica refractory (including Al₂O₃ 15-30%) 2. Clay refractory (including A_l2O₃ 30-48%) 3.High alumina refractory (including Al₂O₃> 48%)

(3)Siliceous composition

Materials containing more than 90% SiO₂ are usually called silicon refractory materials, mainly including silicon bricks and fused silica products. Silica bricks are produced using silica as the main raw material, and their SiO₂ content is generally not less than 93%. The main mineral composition is scaly quartz and cristobalite.

(4) Dolomite

Alkaline refractory produced with natural dolomite as the main raw material is called dolomite refractory. The main chemical composition is: 30-42% of MgO and 40-60% of CaO, and the sum of the two should generally be greater than 90%. Its main mineral components are periclase and calcite (calcium oxide).

(5) Carbon composite products

Carbon composite refractories refer to refractories produced by combining different forms of carbon materials with corresponding refractory oxides.

(6) Zirconium-containing refractories

Zirconium-containing refractory materials refer to refractory materials produced using zirconium-containing materials such as zirconia (ZrO₂) and zircon. Zircon-containing refractory products usually include zircon products, zircon mullite products, zircon corundum products, and the like.