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Acid-Resistant High Alumina Bricks
Introduction
Acid-Resistant Alumina Bricks (also called Acid-proof Alumina Brick) are made from chamotte, flint clay and combining clay powder, being high pressure pressed and sintered in high temperature. Which means anti corrosive and acid resistant material, which uses quartz, feldspar and clay as main raw materials and is fired by high temperature.
Acid-resistant Alumina bricks are low lime and iron content, and are vitrified at high temperatures in ceramic kilns.
Acid proof/resistant bricks have many good properties such as high acid resistance, high thermal insulation, high density, low water absorption, good corrosion resistance, not easy being oxidized at room temperature, not easy being polluted.
Acid proof brick can resist most acids like warm chlorine saline, hydrochloric acid, sulfuric acid, nitric acid except hydrofluoric acid and hot Phosphoric acid. Also it can resist alkali with different density at room temperature.
Acid proof brick main component is SiO2. When SiO2 is burned in high temperature, there are lots of polyaluminum andalusite which can resist acids strongly. Acid resistant brick also can resist alkali at room temperature because of high density, low water absorption. But it does not resist alkali at high temperature.
Application:
Acid resistant brick is widely used in chemical industry such as workshop, outdoor acid resistant floors, anti corrosion lining of tower, tank, sink, etc.
Acid resistant bricks are used to construct floorings vulnerable to acid attack, the lining of chambers and towers in chemical plants, the lining of sewers carrying industrial effluents, etc., to prevent deterioration of the surface by acids.
Features:
· High acid resistance, Smooth surface, Precise size.
· High thermal insulation, Low water absorption,
· Anti-permeability, Anti-freeze, Salt resistance, Good adhesive property with other materials.
· Can be installed on wet surface without drying, can get hardened under water or moist environment.
· Easy to be constructed, Easy to be cleaned.
· Can be customized.
Technical Index
Item |
Composition |
SiO2, % |
60-70 |
Al2O3, % |
20-30 |
FeO, % |
0.5-2.5 |
Bulk Density, g/cm3 |
1.8-2.3 |
Acid Resistance, % |
＞99.8 |
Water Absorption, % |
≤0.02 |
Bending Strength, Mpa |
＞58.8 |
Compressive Strength, Mpa |
≥120 |
Standard sizes:
Dimensions in mm |
Tolerances in mm |
|
Length |
230 |
±3.5 |
Width |
114 |
±2.0 |
Depth |
64 |
±1.0 |
Remarks:
All sizes brick can be made single side groove or double sides groove, glaze or non-glaze.
Special size and OEM service are provided, too.
Non Glaze: anti-skidding, anti-exposure.
Glaze: Easy to clean, smooth and clear.
Types of Acid-Resistant Bricks
The acid-resistant bricks shall be manufactured in two classes:
1. Class I Bricks
These acid-resistant bricks are recommended for severe conditions of corrosive environments, as seen in pickling tanks, storage tanks, and heavy-duty floors subject to frequent contact with corrosives liquids.
2. Class II Bricks
These types of acid-resistant bricks are recommended for working areas and floors subject to occasional spillage of fumes, acids, and chemicals in fertilizer silos. These are also used for skirting and lining silos.
Criteria for Conformity for Performance Requirement of Acid-Resistant Alumina Bricks
Sl No |
Requirement |
Class I Bricks |
Class II Bricks |
1 |
Water Absorption |
≤ 2% |
4% |
2 |
Flexural Strength |
≥ 100kg/cm2 |
70 kg/cm2 |
3 |
Compressive Strength |
≤ 700kg/cm2 |
500 kg/cm2 |
4 |
Resistant to Acid |
≤ 1.5% |
4% |
5 |
Bulk Density (g/cm3) |
2.1~2.3 |
1.8~2.1 |
Cold Crushing Strength (MPa) |
30~32 |
25~28 |
|
Refractoriness Under Load (0.2MPa) ℃ |
1350 |
1280 |
Advantages of Acid-Resistant High Alumina Bricks
1. It possesses features of high acid resistance, low water absorption rate, is not easily oxidized under room temperature, and does not get contaminated easily.
2. It is used in chemical industries, such as ditch puzzle acid, acid wells, acid storage libraries, and acid impacted ground.
3. It is a cost-saving material when the special metals and alloys become uneconomical due to chemical attacks at high temperatures.
4. These acid-proof brick liners can lower concentration and temperature levels by making it feasible to use less expensive alloys.
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