High Purity Tabular Alumina
Description
Technical Parameters
Products Description
99% high purity tabular alumina (also known as alpha alumina) is a high-purity sintered corundum. It does not add any additives such as magnesium oxide (MgO) or boron trioxide (B ₂ O3) during the process of complete sintering densification. This material has a sheet-like crystal structure, with small pore size and a high proportion of closed pores; Its porosity is roughly equivalent to that of fused alumina, but it also has the characteristics of high purity, excellent volume stability, and extremely low re firing shrinkage rate. In addition, plate-shaped alumina also has good thermal shock stability and bending strength.
Technical Parameters
|
Composition Type |
Al2O3 (%) |
SiO2 (%) |
Na2O (%) |
Fe2O3 (%) |
Bulk Density (g/cm3) |
Apparent Porosity (%) |
Water Absorption (%) |
|
MA-35 |
≥99.2 |
≤0.20 |
≤0.40 |
≤0.10 |
≥3.50 |
≤5.0 |
≤1.50 |
|
Typical Value |
99.5 |
0.1 |
0.36 |
0.08 |
3.55 |
3.6 |
1 |
application
Steel and metallurgical industry
High purity tabular alumina can used for ladle lining, refining furnaces, aluminum magnesium carbon bricks, and sliding door panels. It improves the corrosion resistance and thermal shock stability of refractory materials, and adapts to the harsh environment of high-temperature molten steel erosion.
Cement and building materials industry
Suitable for the firing zone, transition zone, and kiln mouth of cement rotary kilns, as well as cyclone separators and cooling equipment. It resists alkali corrosion and high temperature deformation, reducing the frequency of lining replacement.
Petrochemical and waste incineration
Suitable for lining steam cracking furnaces, gasifiers, and waste incinerators. Resistant to high temperature corrosion and chemical erosion, ensuring long-term stable operation of the equipment.
Foundry and Ceramic Industry
Used as aggregate for high-performance casting materials and kiln furniture. It has good volume stability and will not contaminate ceramic blanks or cast products.
Electrical and catalyst fields
Due to its high insulation, high purity, and stable structure, it is used as an electrical insulator and catalyst carrier, meeting the requirements of precision electrical and catalytic materials.
Advantages
1. High purity and low impurity content
High purity tabular alumina has an Al ₂ O3 content of ≥ 99.2% (typical value 99.5%), low Na content, low Fe ₂ O3, SiO ₂, and other harmful impurities. High purity ensures the fire resistance and structural stability of refractory materials.
2. Excellent plate-like crystals and closed cell structure
Under the microscope, it is composed of 50-400 μ m plate-like α - Al to form ₂ O3 crystals, with most of the pores closed and evenly distributed. This structure effectively prevents the infiltration of slag and corrosive gases, greatly improving the corrosion resistance of refractory products.
3. Excellent volume stability and minimal reperfusion contraction
It undergoes complete sintering and shrinkage during the production process, with almost no dimensional changes during secondary use. This solves the problem of cracks caused by material shrinkage in high-temperature furnaces and maintains the integrity of the lining and refractory components.
4. Excellent thermal shock resistance
It remains stable under rapid heating and cooling cycles, and is not easily peeled or cracked. It also has strong creep resistance at high temperatures and is suitable for long-term use in large industrial furnaces.
5. High packing density and low water absorption rate
Bulk density ≥ 3.50 g/cm ³, apparent porosity ≤ 5.0%, water absorption ≤ 1.50%. High density and low water absorption reduce the amount of binder used in refractory material production, improve the strength of the finished product, and extend its service life.
6. Strengthening academic inertia
It is inert to most acids, bases, molten metals, and slag and does not react with industrial media. It is widely used in harsh working conditions such as steelmaking, cement calcination, and petrochemical cracking furnaces.
Package&Shipment
25kgs/1000kgs/1250kg/Jumbo bag(BB)or on pallet; or as customer's requirement.
Why choose HUAO's tabular alumina?
1. No additives, truly high-purity
We don't add any sintering additives during the production process to ensure the natural high-purity characteristics of the material. All indicators are real test data, without false markings, and meet the production standards of high-end refractory materials.
2. Stable sintering process
Adopting high-temperature vertical kiln rapid sintering process, precise control of temperature and time, ensuring uniform crystal development and stable batch performance. The qualified rate of finished products is over 99%.
3. Full granularity customization
We can provide various particle sizes (coarse, medium, fine powder) according to the customer's formula and equipment requirements, supporting customized screening and packaging to match different refractory material production processes.
4. Strict quality inspection system
Each batch of products undergoes chemical composition and physical performance testing, and supports third-party testing. We provide a complete test report.
5. Professional packaging and safe transportation
Standard packaging: 25kg bags, 1000kg, 1250kg ton bags. We can also customize the packaging size, which is moisture-proof and wear-resistant, suitable for sea and air transportation, ensuring that the products arrive intact and undamaged.
FAQ
Q1: What is the difference between high-purity flake alumina and ordinary calcined alumina?
A1: Tabular alumina has a plate shaped crystal structure and closed pores, with higher purity, better thermal shock resistance, almost no re firing shrinkage, and far superior high-temperature performance compared to ordinary calcined alumina.
Q2: Can you provide free samples for testing?
A2: Yes, we provide free regular particle size samples.
Q3: What particle size products can you provide?
A3: We can customize various particle sizes from coarse aggregates to fine powders according to customer needs, covering all common specifications in refractory material production.
Q4: What payment terms do you accept?
Q4: We accept wire transfers: a 30% deposit is paid upon placing the order, and the remaining balance is paid in full before shipment.
Q5: How long is the delivery time?
A5: Regular specifications are available in stock and can be shipped within 7 working days; Customizing particle size products takes 10-15 working days.
With stable quality, complete certification, and rich export experience, HUAO's products are trusted by customers in more than 30 countries and regions. Tell us your application industry, product type, granularity requirements, and annual usage, and our technical team will recommend the most suitable product and support plan for you within 30 minutes. We provide free samples, professional technical guidance, and factory direct prices.
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