What Temperature Can Refractory Bricks Withstand?
Clay fire brick temperature resistance: 1580~1750 °C;
Crystalline silicon brick: 1730~1770 °C;
High alumina brick firing temperature: > 1770~2000 °C;
Silica brick: 1690~1730 °C;
Magnesia brick: > 2000°C
Magnesia chrome brick: > 2000 degrees
Hard clay: 1750~1770°C
Dolomite brick: > 2000°C
Zirconia brick: > 2400 ° C
Corundum brick: 1770~2000 °C, the load softening starting temperature is greater than 1700 °C;
(1) Siliceous ingredients
Materials containing more than 90% SiO2 are commonly referred to as siliceous refractories, primarily including silica bricks and fused silica. Silica brick is produced from silica as the main raw material, and its SiO2 content is generally not less than 93%. The main mineral composition is tridymite and cristobalite.
(2) Aluminosilicate
The alumina silicate refractory is composed of Al2O3 and SiO2 and a small amount of impurities. According to its Al2O3 content, it can be divided into: 1. Semi-silica refractory (including A12O3 15-30%)
2. Clay refractory material (including Al2O3 30-48%)
3. High alumina refractory material (including A12O3>48%)
(3) Magnesia refractory
Magnesia refractory material refers to an alkaline refractory material with magnesia 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%, Al2O3 content is generally 7-8%, the main mineral composition is periclase and magnesium aluminum spinel (MgAl2O4);
Magnesium-chromium products: containing magnesium oxide > 60%, the content of Cr2O3 is generally below 20%, the main mineral components are periclase and chrome spinel;
Forsterite and magnesium siliceous products: main component: magnesia, the second chemical composition is sillimanite olivine brick contains more silica than magnesia silica brick, the former's main mineral component is forsterite, Followed by periclase; the latter's main mineral is periclase, followed by forsterite;
Magnesium calcium products: This magnesia material contains a certain amount of calcium. The main mineral component contains a certain amount of dicalcium silicate (2CaO silica?) in addition to the periclase.
