Brief Introduction
Low cement castables use calcium aluminate cement as the binder, and castables with less than 2.5% CaO content are commonly referred to as low cement castables. Different from traditional castables, low-cement castables, ultra-low-grade aggregated superfines with the same or similar chemical composition as the main material (with a particle size of less than 10 microns) replace most or all of the cement, and refined and scientifically optimized particles. Grading, fine powder, particle morphology and other factors, at the same time adding a small amount of dispersant (water reducing agent) and moderate amount of retarder and other compound admixture prepared. 
Technical Datas
| Models | LC 45 | LC 60 | LC 70 | LC 80 | LC 90 |
| Chemical Analysis | |||||
| Al2O 3 % min | 45 | 60 | 70 | 80 | 90 |
| Fe2O3 max | 1 | 1.5 | 1.5 | 1.8 | 1 |
| Si2O max | 47.8 | 33.2 | 23 | 12.2 | 5.7 |
| CaO max | 1.7 | 1.7 | 1.3 | 1.8 | 1.7 |
| Physical Properties | |||||
| Service Temp. º C | 1550 | 1600 | 1600 | 1700 | 1700 |
| Bulk Density gmc/cc | 2.3 | 2.6 | 2.7 | 2.9 | 3 |
| Water required for casting % | 4.8 - 5.5 | 4.7 - 5.7 | 4.7 - 5.4 | 4.2 - 5.0 | 4.2 - 5.0 |
| Grain Size mm | 6 | 6 | 6 | 6 | 6 |
| CCS, Kgs / cm2 | |||||
| at 110 º C/24 hrs. | 700 | 750 | 750 | 800 | 950 |
| at 800 º C/3 hrs. | 800 | 800 | 800 | 900 | 1000 |
| at 1100 º C/3 hrs. | 900 | 900 | 900 | 1000 | 1100 |
| at 1500 º C/3 hrs. | 1000 | 1000 | 1000 | 1200 | 1200 |
| Thermal Properties | |||||
| PLC,% | |||||
| after heating at 800 º C/3 hrs. | (+)(-)0.20 | (+)(-) 0.20 | (+)(-) 0.20 | (+)(-) 0.20 | (+)(-) 0.20 |
| after heating at 1100 º C/3 hrs. | (+)(-) 0.30 | (+)(-) 0.30 | (+)(-) 0.30 | (+)(-) 0.30 | (+)(-) 0.30 |
| Thermal conductivity,Kcal/mhr º/C | |||||
| at 300 º CHF | 0.84 | 0.96 | 1.16 | 1.68 | 2.2 |
| at 500 º CHF | 1.04 | 1.1 | 1.23 | 1.75 | 2.31 |
| at 800 º CHF | 1.16 | 1.2 | 1.29 | 1.8 | 2.35 |
Application
Low cement castables are mainly used in the bottom of the glass kiln, the front and back of the kiln door sill cooling machine, and other high-temperature resistant parts, front and rear kiln mouths, coal injection pipes, etc.; various heat treatment furnaces such as heating furnace and soaking furnace; medium frequency induction furnace lining, petrochemical catalysis High temperature wear resistant linings for cracking reactors, linings for other industrial furnaces. Can be cast, smeared, and beaten on site.
Clay and high-aluminum low-cement castables can be used as linings for heating furnaces, soaking furnaces, various heat treatment furnaces and rotary kilns.
Mullite low-cement castables can be used as inner linings for various high-temperature burners, dressing linings for heating furnace water-cooled pipes, etc. Corundum-based and chromium-containing corundum-based low-cement refractory castables can be used as inner linings for the triangle area on the roof of steelmaking electric arc furnaces , The lining of some parts of the refining device outside the molten steel furnace, such as the integral spray gun lining for spray metallurgy, the RH and DH vacuum degassing device and the dipping tube lining, the lining of the power frequency induction furnace, the high temperature of the petrochemical catalytic cracking reactor Wear-resistant lining, etc.
Al2O3-SiC-C low-cement castables are used as linings for blast furnace tapping troughs, iron furnace tapping troughs, and integral spray guns for molten iron pretreatment.
MgO-Al2O3 or Al2O3-MgO.Al2O3 low-cement castables are used as linings for ladles and tapping troughs.