Low cement castable is developed on the basis of clay and refractory castables. It mainly includes low cement, super low cement, non-cement refractory castable. It is of many advantages, such as high density, low apparent porosity, high strength, low abrasion, thermal shock resistance, corrosion resistance, etc.
High density and strength, good using effect.
The content of CaO is lower, which reduces the producing of eutectic phase in material and develops its refractoriness, high temperature strength and slag erosion resistance.
The water used for the blending of castable during construction is only 1/3~1/2 of water for normal use, which realizes low apparent porosity and high bulk density.
After moulding by casting, the cement compound produced during maintenance is less. There is no damage of large amount of hydrated bond during heating and roasting, which will reduce the medium temperature strength. But for low cement castable, the strength increases with the increase of heating temperature.
Adjusting the size composition of castable can compound self-flow castable and pump irrigation castable.
Low cement castable is used in the back kiln eye, wicket cover and back of cooling machine of cement rotary kiln and other thermal equipment with good performance and long service life.
|Low Cement Castable||Corundum||Alumina||Clay|
|Chemical composition, %||Al₂O₃ ≥||90||80||70||60||50||40|
|Bulk density, g/cm3 ≥||110℃×24h||2.95||2.75||2.6||2.5||2.4||2.3|
|Compressive strength, MPa ≥||110℃×24h||60||45||45||40||40||40|
|Breaking strength, MPa ≥||110℃×24h||8||7||6||6||6||6|
|Linear Change PLC, % ≤||110℃×24h||-0.1||-0.1||-0.1||-0.1||-0.1||-0.1|
|Max. service temperature, ℃||1700||1600||1500||1450||1400||1350|