What is lightweight refractory castable
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Time：
2024-02-23
Castables with a volumetric density less than 1.5 and a specific gravity are lightweight refractory castables, mainly used for insulation and heat preservation. Castables with a body density greater than 1.5 and less than 1.8 can be called semi lightweight castables, while castables with a body density greater than 1.8 are called heavy castables.
The raw materials for lightweight castables are lightweight aggregates and powders added in proportion, and binders are also combined with high alumina cement. There are also water glass and phosphoric acid combined, but the binder for lightweight castables is added too much, and the proportion of water added during construction is also higher than that of heavy castables.
The characteristics of lightweight castables are low density, light weight, low thermal conductivity, and good insulation effect. There are various types of lightweight castables, and their properties are also neutral and acidic.
The lining of the kiln is basically insulated, and the lightweight casting material used for the insulation layer cannot directly flame. The outer layer of the insulation layer usually has casting material or refractory bricks used for the working layer. Lightweight refractory casting materials have good insulation effect, slow heat dissipation speed, and good insulation effect. And it can save fuel for the kiln. Use different lightweight castables or lightweight castables with different properties in different kiln linings.
Some high-end lightweight refractory castables can also be used as working layers in furnace linings, such as acid resistant lightweight castables with a specific gravity of 1.5. When used in chimneys or flues, the effect is also quite good. Using this lightweight castable will make the chimney lighter and reduce pressure. There is also alumina hollow ball refractory castable, which is a high-end material among lightweight castables and can be used in special lightweight kiln linings. It is not only heat-resistant but also lightweight.
Lightweight casting materials are lightweight, have low thermal conductivity, are convenient to use, and are also cost-effective. Moreover, according to different market demands, composite lightweight refractory castables are constantly developed to meet the needs of furnace lining.
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