Dolomite brick heat insulation Refractory Materials Iron and steel smelting
Refractory bricks are called refractory bricks. Refractory fired from refractory clay or other refractory materials. Light yellow or brown. It is mainly used in building smelting furnace and can withstand high temperature of 1580 ℃ - 1770 ℃. Also called refractory brick. Refractory of certain shape and size. According to the preparation process, it can be divided into sintered brick, non sintered brick, fused cast brick (fused cast brick) and refractory and heat insulation brick; It can be divided into standard brick, ordinary brick, special-shaped brick, etc. according to shape and size. It can be used as the structural material of high-temperature building materials, building kilns and various thermal equipment. It can withstand various physical and chemical changes and mechanical effects at high temperature. Such as refractory clay brick, high alumina brick, silica brick, magnesia brick, etc.
1, chemical composition: the main composition determines the quality and characteristics of the refractory
2, volume density: unit volume weight, high density, indicating good density, strength may be high, but the thermal conductivity may be large.
3, apparent porosity: no specific requirements, but as a manufacturer must strictly control the apparent porosity.
4, load softening temperature: also known as high temperature load deformation temperature, this parameter is very important, marking the high temperature resistance of the material
5, thermal shock resistance: resistance to rapid temperature changes without being damaged
6, compressive strength: withstand (room temperature) the maximum pressure capacity
7, flexural strength: the ability to withstand shear pressure
Dolomite brick is a refractory product made of calcined dolomite sand. Usually contains calcium oxide (CaO) more than 40%, magnesium oxide (MgO) more than 35%, but also contains a small amount of silicon oxide (SiO2), alumina (Al2O3), iron trioxide (Fe2O3) and other impurities. The CaO/MgO ratio of natural dolomite fluctuates greatly. If the CaO/MgO ratio in the brick is less than 1.39, it is called magnesian dolomite brick. Dolomite brick can be divided into tar (asphalt) bonded non-fired brick, light fired oil-immersed brick and fired oil-immersed brick according to the production process. Dolomite brick contains free CaO, which is easy to hydrate and crack in the air and should not be stored for a long time.