Refractory castable is a refractory used for pouring lining of high-temperature kiln. It is an amorphous refractory and an important kind of refractory.
The density of refractory castable, also known as bulk density, is one of the important test items in the physical and chemical indexes of refractory castable. The bulk density index of refractory castable is a comprehensive reflection of the pore volume and mineral composition in the castable. Generally, the bulk density reflects the compactness of refractory castable after pouring.
The volume density of refractory castable is expressed in g / cm3. Generally, the volume density of refractory castable ranges from 0.4 to 3.4. The larger the value of volume density, the higher the volume density of castable, the castable lining can better resist the erosion of external slag, and the air tightness of casting lining is better.
Refractory castables are divided into clay castables, high alumina castables, mullite castables, corundum castables, siliceous castables, magnesia castables, Low Cement Castables, wear-resistant castables, steel fiber castables and other refractory castables according to their materials. The bulk density of different refractory castables is also different; Refractory castables can be divided into light castables and heavy castables according to bulk density.
It is generally divided into light castable and heavy castable by 1.5g/cm3, and the bulk density of light refractory castable is 0.5g/cm3, 0.6g/cm3, 0.8g/cm3, 1.0g/cm3, 1.2g/cm3 and 1.5g/cm3; The bulk densities of heavy castables are 2.0g/cm3, 2.2g/cm3, 2.3g/cm3, 2.4g/cm3, 2.5g/cm3, 2.6g/cm3, 2.7g/cm3, 2.8g/cm3, etc. These are common bulk densities of refractory castables.
The bulk density of refractory castables of different materials also has a range. For example, the range of clay castables is 2.0-2.2g/cm3; The range of high alumina castable is 2.4-2.7g/cm3; The above bulk density of castable is for reference only.
Bulk density is one of the important physical and chemical indexes when purchasing refractory castables, and it is also one of the physical and chemical indexes to measure the quality of refractory castables.