Lightweight castables are lightweight, have low thermal conductivity, are easy to use, and are cheap. Lightweight castables are also continuously developed according to the different needs of the market. Composite lightweight refractory castables are continuously developed to meet the use of furnace linings.
What is Lightweight Insulating Refractory Castable?
Lightweight Insulating Refractory Castable is a refractory castable with lightweight, high strength, and excellent thermal insulation properties. It is mainly composed of lightweight aggregates (such as perlite, vermiculite, etc.), high-temperature stable materials, binders, and additives.
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| lightweight insulating refractory castable |
Introduction to Lightweight Insulating Refractory Castables
Lightweight insulating refractory castables have many advantages, such as low thermal conductivity, low heat capacity, good thermal insulation properties, earthquake resistance, impact resistance, erosion resistance, etc. It is widely used in various high-temperature industrial equipment, such as industrial furnaces, heat treatment furnaces, steel furnaces, glass melting furnaces, etc. To improve the energy efficiency of equipment and reduce energy consumption.
According to the material composition and performance characteristics of lightweight insulating refractory castables, they can be divided into different types. Such as perlite lightweight heat-insulating refractory castables, vermiculite lightweight heat-insulating refractory castables, high-aluminum lightweight heat-insulating refractory castables, etc. Each type of lightweight insulating refractory castable has its own unique characteristics and scope of application, and users should choose according to specific circumstances.
When using lightweight insulating refractory castables, you need to pay attention to the following points:
The mixing ratio. The mixing ratio of lightweight insulating refractory castables should be in accordance with the instructions for use. Different types of lightweight insulating refractory castables have different mixing ratios, and users should choose according to specific conditions.
Construction method. The construction method of lightweight insulating refractory castables can be selected according to specific conditions, and methods such as manual construction, mechanical construction, and pumping construction can usually be used. Different construction methods will affect the density and uniformity of castables.
maintenance. Lightweight heat-insulating refractory castables should be kept moist during the curing period, and the curing time is generally more than 24 hours. During the curing period, it is necessary to prevent the castable from drying out prematurely and causing cracking.
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| lightweight high-strength insulating refractory castable |
Lightweight Refractory Castables with a Bulk Density of Less than 1.5g/cm3
Refractory castables with a bulk density of less than 1.5g/cm3 are lightweight refractory castables. Lightweight refractory castables mainly play the role of thermal insulation. Refractory castables with a bulk density greater than 1.5g/cm3 and less than 1.8g/cm3 can be called semi-lightweight castables. Castables greater than 1.8 are heavy castables.
The raw materials of lightweight castables are lightweight aggregates and powders added in proportion, and the binding agent is also combined with high alumina cement. There is also a combination of water glass and phosphoric acid. However, the amount of 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, lightweight, low thermal conductivity, and good heat insulation effect. There are many varieties of lightweight castables, and their properties can be divided into neutral and acidic.
Application of Lightweight Refractory Castables in Kiln Linings
The lining of the kiln is basically equipped with a heat insulation layer. The lightweight castable used in the heat insulation layer cannot directly contact the flame. The outer layer of the insulation layer usually has castables or refractory bricks for the working layer. Lightweight refractory castable has a good heat insulation effect, slow heat dissipation, and a good heat preservation effect. And it (http://www.aluminabricks.com/refractory-castable/lightweight-refractory-castable/) can save the fuel used by the kiln. In different kiln linings, different lightweight castables or lightweight castables with different properties are used.
Some high-grade lightweight refractory castables can also be used as the working layer in the furnace lining. For example, acidic acid-resistant lightweight castables with a specific gravity of 1.5 can be used in chimneys or flues, and the effect is quite good. Using this lightweight castable will make the chimney lighter and reduce stress. There is also an alumina hollow ball refractory castable, which is a high-end material among lightweight castables. Can be used within special lightweight kiln linings that are not only high-temperature resistant but also lightweight.
To purchase high-quality lightweight refractory castables, please choose Rongsheng Refractory Materials Manufacturer. We can provide you with comprehensive refractory lining material services and good customer service to ensure long life and efficient operation of high-temperature industrial furnace linings.
