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Description
Diatomite-based heat-insulating bricks for high-temperature heat insulation with an operating temperature of 900 to 1300 °C
DESCRIPTION
Heat-insulating bricks and blocks of various types are presented in a wide range of products with different density, mechanical strength and thermal conductivity. Bricks and blocks are baked and designed for application at temperatures of 900 to 1300 °C.
Diatomite-based insulating bricks are classified as ultra-lightweight and lightweight with a density of 350 to 1700 kg/m3. They have excellent heat-insulating properties, high mechanical strength, and also an ability to increase their mechanical strength with increasing temperature. Due to their insignificant thermal expansion and compression, they possess high thermal stability. Compared to other porous materials, diatomite-based bricks are characterized by low gas permeability and ability to resist moderate acidic effects. One of the most preferred properties of this product is high content of amorphous silica, which increases viscosity of bricks and blocks when they come into contact with melts and slags.
Different types of diatomite-based heat-insulating bricks are represented by two groups: Porous and Durable.
The following types of products belong to the bricks of this group:
- KPD-350
- KPD-400
- KPD-450
- KPD-500
They are structural, ultra-lightweight, porous bricks with extra-low thermal conductivity, moderate resistance to adequate mechanical loads. thay can be stored at low temperatures, characterized by minimal deformation when compressed and low value of thermal expansion coefficient. Bricks are ground over all six faces with maximum dimansional limits according to the manufacturer’s specifications: ± 1mm.
For physical and chemical properties of products refer to Table 3.
| KPD-350, KPD-400, KPD-450, KPD-500 |
|---|
| Porous bricks and blocks are used at temperatures up to 900 °C and applied as heat insulation for critical structures with a high degree of heat efficiency. These products are used in aluminum electrolyzers, baking furnace for carbon products, ferrous metallurgy furnaces, furnaces for firing and drying ceramic products, incinerators, cement kilns and other thermal units. They are manufactured in accordance with the current regulatory documentation of the manufacturer.
Application: |
DURABLE BRICKS AND BLOCKS
The following types of products are included into this group of bricks and blocks:
- SUPRA
- М-EXTRA
- М-EXTRA 24
Durable bricks and blocks SUPRA, M-EXTRA, M-EXTRA 24.
Durable types of bricks and blocks are used in critical structures at temperatures up to 1300 °C as heat insulation of refractory lining, which combines high mechanical strength and good heat insulation properties.
| SUPRA |
|---|
| Bricks of this grade have natural porosity and combine high mechanical strength and excellent heat insulation properties, contain negligible amount of sulfur, which allows using the bricks of this type in the lining of furnaces for the production of nickel alloys. Heat insulation bricks SUPRA are widely used in a variety of structures: gas and air blowing ducts, regenerators, boilers, fluidized bed circulating boilers, chimneys, tunnel kilns, glass melting furnaces and furnaces of ferrous secondary metallurgy. These bricks are particularly recommended for structures where good strength characteristics are required. |
| M-EXTRA, M-EXTRA 24 |
|---|
| These bricks are characterized by exceptionally high mechanical strength, which is achieved without deterioration of their high heat insulation properties. Bricks are distinguished by dimensional stability, have low gas permeability and low sulfur content, which is especially favorable for their use in the lining of furnaces producing nickel alloys. Bricks M-EXTRA have extremely high mechanical strength and high resistance to the impact of melts and slags. These bricks are designed for high-temperature heat insulation, including in combined lining of various thermal units experiencing very high mechanical stresses.
Bricks M-EXTRA, M-EXTRA 24 can be used as insulation, for example, in rotary kilns for raw materials (Cement, Lime, Chamotte, Bauxite, etc.), shaft and other furnaces. They are also suitable for hot air ducts, heat exchangers and can be used as refractory lining in furnaces with temperatures up to 1300 °C. The distinctive feature of M-EXTRA bricks |
Recommended refractory mortars for laying
For setting of porous heat-insulating bricks of KPD-350, KPD-400, KPD-450, KPD-500 grades and also durable bricks of SUPRA, M-EXTRA, M-EXTRA 24 grades, various appropriate refractory and masonry mortars are used.
For the selection of refractory and masonry mortars refer to pages «Refractory and masonry mortars»
Standard dimensions of SUPRA, M-EXTRA, M-EXTRA 24
Heat-insulating bricks of rectangular, arc-shaped, bevelled, wedge-shaped and other shapes are produced (refer to Figure 1) with dimensions corresponding to international standards and dimensions of refractory bricks with which these products are often used.
Upon customer’s request bricks and blocks of special shape can be made to fulfill the specific requirements of the buyer. For more information, please contact our specialists.