The traditional thermal insulation materials for ladle are gradually replaced by new environmentally-friendly thermal insulation materials due to easy pollution.
1. Selection of thermal insulation material
Composite reflective insulation panels have been widely used for their high temperature strength, low thermal conductivity, low heat capacity, strong thermal stability, safety and environmental protection, opening up new avenues for new environmentally friendly thermal insulation materials and negative energy consumption technologies.
The composite adiabatic reflector adopts light-weight and inorganic nano-SiO2 with very low thermal conductivity ( as a spacer material, and the aluminum foil with high reflection is used as the interlayer material, and the multi-layer composite structure is formed by continuous circumferential coating composite rolling process, and the heat conduction thereof is adopted. The coefficient is smaller than the static air coefficient, and the thermal insulation performance is one to five times higher than that of the conventional fiber-based thermal insulation material, and it is the best thermal insulation material to date.
2, the choice of insulation material
The technology of unshaped refractory materials is becoming more and more mature, and the lightweight high-strength castables have the characteristics of low bulk density, low thermal conductivity and high compressive strength, and are widely used.
The aggregate of castable is made of floating beads, high alumina porous clinker and alumina hollow ball composite aggregate, so that the castable has high bulk density, low thermal conductivity, good thermal insulation performance, high refractoriness and high compressive strength. Performance. The clay clinker powder and the industrial alumina powder are used as the powder, so that the Al2O3 content in the castable reaches 45% to 50%. Pure calcium aluminate cement is used as a binder to ensure high strength after casting without reducing the Al2O3 content. At the same time, a certain amount of fused magnesia is added to maintain the volume stability of the product, so that the castable has a certain continuous expansion during use, thereby reducing the cracking and peeling during use and improving the service life.