Lightweight clay refractory castables are castable amorphous refractory materials made of lightweight refractory aggregates, refractory powders, binders and admixtures, etc., which are mixed with water or a solution containing a binder during construction. It is generally used as a thermal insulation lining for thermal equipment to keep warm and reduce energy consumption.
Lightweight clay refractory castables Castables with a bulk density of less than 1.5 specific gravity are lightweight refractory castables, which mainly have thermal insulation functions.
Lightweight clay refractory castables have the characteristics of high porosity and low thermal conductivity. They also have certain refractory properties and good thermal insulation properties, which can effectively save energy (reducing heat loss by 20%~80% compared with general refractory materials), improve kiln operation rate, and reduce equipment load.
Lightweight clay refractory castables are packed in plastic bags with inner film and ton bags, which are convenient for loading and unloading.
The raw materials of lightweight castables are aggregates and powders added in proportion with light body density, and the binder is also combined with high-alumina cement. There are also those that use water glass and phosphoric acid, but the binder added to lightweight castables is large, and the proportion of water added during construction is also larger than that of heavy castables.
The characteristics of lightweight castables are low density, light weight, low thermal conductivity, and good thermal insulation effect. There are many varieties of lightweight castables, and their properties are also divided into neutral and acidic.
The lining of the kiln is basically equipped with an insulation layer. The lightweight castable used for the insulation layer cannot be directly exposed to flames. The outer layer of the insulation layer generally has a castable or refractory brick used for the working layer. The lightweight refractory castable has good insulation effect, slow heat dissipation, and good heat preservation effect. It can also save fuel for the kiln. Different lightweight castables or lightweight castables of different properties are used in different kiln linings.
Lightweight casting material
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Brand |
HX-150 |
HX-80 |
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Max.service temperature |
1200 |
800 |
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Construction requirements (T/M³) |
1.6 |
0.9 |
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Additional water (%) |
30-35 |
35-41 |
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Chemical composition Al2O3 (%) |
≥35 |
-- |
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Bulk density after drying at 110℃×24hr (g/cm³) |
≤1.55 |
≤0.80 |
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Permanent linear change 110℃×24hr after drying at 800℃×3hr firing at 1000℃×3hr |
±0.5 -- ±1.0 |
±0.5 ±1.0 -- |
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Cold modulus of rupture after drying at 110℃×24hr firing at 800℃×3hr 1000℃×3hr |
≥2.5 -- ≥1.0 |
≥1.0 ≥0.20 -- |
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Cold crushing strength after drying at 110℃×24hr firing at 800℃×3hr 1000℃×3hr |
≥9.0 -- ≥6.0 |
≥3.0 ≥2.5 -- |
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Thermal conductivity (kcal/mh℃) at 500℃ 1000℃ |
≤0.35 ≤0.45 |
≤0.20 ≤0.22 |
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Characteristics |
Water set |
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Applications |
Chimney flue |
General use |
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