| 摘要 |
PURPOSE:To enhance strength, refractoriness, heat insulating property, work efficiency and safety by impregnating specified lightweight aggregate with a water insoluble thermosetting liq. material or coating the aggregate with the liq. material. CONSTITUTION:Magnesia-based lightweight aggregate contg. 95% MgO, <=20% Al2O3 and about 1% SiO2+B2O3 and having 0.1-4mm diameter and 10-50mum average pore diameter is prepd. A water insoluble thermosetting liq. material such as phenol resin is impregnated into the aggregate by 5-10% or the aggregate is coated with the liq. material and drying is carried out to obtain refractory lightweight aggregate. This aggregate is then mixed with castable alumina and 6-15% water. |
