activated alumina
Activated alumina is a highly porous form of aluminum oxide widely used in adsorption and purification processes. Its excellent adsorption capacity, thermal stability, and chemical resistance make it ideal for gas and liquid drying, fluoride removal from water, and catalyst support applications.
Activated Alumina Product Specifications
Key Parameters:
- Chemical Composition: Al₂O₃ >92%
- Appearance: White spherical pellets
- Size Range: 3-5mm, 4-6mm, 5-7mm
- Bulk Density: 0.68-0.72 g/cm³
- Specific Surface Area: 300-350 m²/g
- Pore Volume: 0.38-0.42 cm³/g
- Crush Strength: >100 N/pellet
- Adsorption Capacity: >17% for water at 60% RH
Performance Comparison Table
| Property | Standard Grade | High Capacity Grade | Thermal Stable Grade |
|---|---|---|---|
| Al₂O₃ Content | 92% | 94% | 93% |
| Water Adsorption | 17% | 20% | 16% |
| Max Operating Temp | 600°C | 550°C | 800°C |
| Fluoride Removal Rate | 90% | 95% | 85% |
Activated Alumina Applications
- Air & Gas Drying: Removes moisture from compressed air and industrial gases
- Water Treatment: Effective fluoride and arsenic removal from drinking water
- Petrochemical: Used as catalyst support in refining processes
- Chemical Processing: Selective adsorption in liquid phase applications
Activated Alumina FAQ
Q: What is the typical service life of activated alumina in water treatment applications?
A: The service life depends on water quality and operating conditions. Typically, activated alumina can treat 10,000-15,000 bed volumes of water before requiring regeneration. With proper maintenance including periodic backwashing and regeneration with alum solution, the media can last 3-5 years in fluoride removal systems.
Q: How does activated alumina compare to other adsorbents like silica gel?
A: Activated alumina offers several advantages over silica gel: higher mechanical strength, better thermal stability (up to 600°C vs 300°C for silica gel), and superior performance in acidic environments. While silica gel may have slightly higher initial water adsorption capacity, activated alumina maintains its performance over more regeneration cycles.
Q: What precautions should be taken when handling activated alumina?
A: Although activated alumina is generally safe to handle, we recommend using gloves and dust masks during loading/unloading to prevent irritation from dust. The material should be stored in dry conditions to prevent premature moisture adsorption. When regenerating with high-temperature gas, follow proper procedures to avoid thermal shock which could damage the pellets.
Quality Assurance
Our activated alumina undergoes rigorous quality control including:
- XRF analysis for chemical composition
- BET surface area measurement
- Crush strength testing
- Adsorption capacity verification
- Particle size distribution analysis
Packaging Options
Available in 25kg woven bags with inner PE liner, 500kg super sacks, or bulk shipments. Custom packaging available upon request.