High alumina bricks refer to a type of inorganic non-metallic material with an alumina (Al₂O₃) content exceeding 48% and a refractory temperature exceeding 1580°C. It is a type of aluminum-silicon refractory material. The following is a detailed introduction to the classification and storage methods of high alumina bricks:
Classification
There are many ways to classify high alumina bricks, mainly including the following:
1. Classification by raw material ratio (alumina content):
Special high alumina bricks: alumina content ≥ 80%.
First-grade high alumina bricks: alumina content between 75% and 80%, and there is also a saying that alumina content is > 75%.
Second-grade high alumina bricks: alumina content between 60% and 75%.
Third-grade high alumina bricks: alumina content between 48% and 60%, and there is also a saying that alumina content between 48% and 65%.
2. Classification by mineral composition:
Low mullite (sillimanite) high alumina bricks.
Mullite high alumina bricks.
Mullite-corundum high-alumina bricks.
Corundum-mullite high-alumina bricks.
Corundum high-alumina bricks.
3. Classification by appearance:
Standard bricks.
Ordinary bricks.
Wedge-shaped bricks.
Special-shaped and special-shaped bricks.
4. Classification by performance characteristics or kiln type:
Ordinary high-alumina bricks.
Low creep high-alumina bricks (commonly used in hot blast furnaces).
High-load soft high-alumina bricks.
Micro-expansion high-alumina bricks.
Phosphate-bonded high-alumina bricks (commonly used in ceramsite, lithium oxide, zinc oxide rotary kilns).
Anti-stripping high-alumina bricks for cement kilns.
In addition, according to different parts of use, high-alumina bricks of different sizes, specifications and shapes can also be selected, such as knife-shaped, axe-shaped, high-alumina arch foot bricks, high-alumina anchor bricks, etc.
Storage method
In order to ensure the quality and performance of high-alumina bricks, the following points should be noted during storage:
1. Drying: High-alumina bricks should be kept dry and avoid moisture during storage and use. Because high-alumina bricks are prone to falling off and cracking after being damp, which affects their performance. In an environment with high humidity, it is recommended to take moisture-proof measures, such as covering with moisture-proof cloth.
2. Avoid acid and alkali erosion: High-alumina bricks should avoid direct contact with acid and alkali substances to prevent erosion. During operation, neutral or weak alkaline materials should be used, and strong acid or strong alkali substances should be avoided.
3. Control the use temperature range: High-alumina bricks have a certain use temperature range. When using, they should be operated according to the characteristics of the material and the specified temperature range to ensure that their performance is not affected.
4. Regular inspection and maintenance: For high-alumina bricks that have been used, regular inspection and maintenance should be carried out, and the debris in the furnace should be cleaned in time to keep the furnace well ventilated to prevent crack expansion and slag erosion.
In summary, there are various ways to classify high-alumina bricks, and certain measures need to be taken during storage to ensure their quality and performance.
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