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Activated Alumina

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Activated Alumina
Activated alumina is a white, porous granular or spherical material, insoluble in water and organic solvents, soluble in acids and alkalis. It absorbs moisture from air but does not swell or crack after water uptake. Its crystal phase is primarily χ-ρ-Al₂O₃ or γ-Al₂O₃, formed by low-temperature dehydration of aluminum hydroxide at 300~600°C. Typical specific surface areas range from 50~300 m²/g or higher, pore volumes from 0.36~0.50 ml/g, and static adsorption capacities from 17%~19%. The product offers high mechanical strength, thermal stability, high-temperature resistance, and corrosion resistance, with drying depths reaching dew points of -40°C to below -70°C.

Product Specifications

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Item Typical Range
Appearance White spherical / strip / granular / powder
Crystal Phase χ-ρ-Al₂O₃ / γ-Al₂O₃
Specific Surface Area ≥120 ~ ≥350 m²/g
Pore Volume 0.30 ~ 0.50 ml/g
Static Adsorption Capacity (RH=60%) ≥17% ~ ≥19%
Water Absorption ≥50% ~ ≥55%
Bulk/Packing Density 0.65 ~ 0.90 g/ml
Crushing Strength ≥40 N/particle ~ ≥180 N/particle (varies by size)
Attrition Rate ≤0.15% ~ ≤0.50%
Operating Temperature 0 ~ 400°C
Regeneration Temperature 180 ~ 250°C

Chemical Composition

Constituent General Desiccant/Support Grade (%) Low-Soda/High-Purity Grade (%)
Al₂O₃ ≥92 ~ ≥95 ≥99.9
Na₂O ≤0.3 ~ ≤0.5 ≤0.04
SiO₂ ≤0.10 —
Fe₂O₃ ≤0.03 ~ ≤0.04 —
Loss on Ignition (1000°C) ≤8.0 —
Moisture Content ≤1.5 —

General-grade values reference technical standards for spherical activated alumina; low-soda/high-purity values derive from high-purity activated alumina product parameters, with Na₂O controlled below 0.04% for alkali-sensitive catalytic and adsorption systems.

Production Specifications

Form Typical Size Primary Application
Spherical φ1.0-1.6 mm, φ2-3 mm, φ3-5 mm, φ4-6 mm, φ5-7 mm, φ6-8 mm Desiccant, defluoridation, catalyst support
Strip/Cylindrical φ3×3-8 mm, φ1.5-2 mm, etc. Petrochemical hydrodesulfurization and hydrocracking catalyst supports
Powder 0.01-0.2 mm (flash-calcined powder, etc.) Powdered adsorbents, specific catalytic systems
Water Treatment Grade 28×48 mesh (0.3-0.6 mm) Drinking water/groundwater defluoridation and arsenic removal beds

Spherical and strip forms are the most common industrial configurations—spherical leans toward drying and adsorption, while strip form is widely used in catalyst supports. Powder form serves applications requiring rapid dispersion or specific particle sizes.

Application Scenarios

Deep Drying of Gases and Liquids:

Industrial Gas Drying: Gas drying in oxygen production, textiles, and electronics; instrument air drying; PSA dew points down to -55°C in air separation; drying and purification in petrochemicals with dew points below -40°C.

Liquid-Phase Dehydration: Transformer oil deacidification and regeneration; removal of fluorides from cyclic alkanes in alkylbenzene production.

Catalysts and Catalyst Supports:

Petrochemical Catalyst Supports: Supports for hydrodesulfurization and hydrocracking reactions, with strip form (φ3×3-8mm) particularly common.

Sulfur Recovery Catalysts: Spherical activated alumina serves as a catalyst in Claus sulfur recovery and similar processes.

Hydrogen Peroxide Adsorbents/Catalysts: Used for working solution regeneration and purification in the anthraquinone process for H₂O₂ production.

Water Treatment and Environmental Adsorption:

Drinking Water Defluoridation: Activated alumina adsorbs fluoride with a fluoride uptake capacity of ≥2.0 mg/g; adsorption is optimal below the zero point of charge (approximately pH 8.2).

Arsenic, Selenium, and Humic Removal: Packed beds of activated alumina remove arsenic (As(V)), selenium, silica, and humic materials from water via ligand exchange between contaminant anions and surface hydroxyl groups.

Other Industrial Applications:

Pressure Swing Adsorption (PSA/VPSA): Used in air separation for oxygen and nitrogen production.

Dechlorination: Specific grades of activated alumina serve as dechlorination agents for gas or liquid streams.

Our Facilities

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  • 1773993033893525306179145728
  • 1773993033893525304778248192
  • 1773993032893525300562972672
  • 1773993032893525299082383360
  • 1773993031893525296293171200
  • 1773993031893525294871302144
  • 1789955364129206

FAQ

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Q1: Is your company a trading firm or a manufacturing plant? Where are your facilities located?
We are an export-oriented enterprise that integrates manufacturing and sales; we are not an intermediary. Our headquarters—handling international sales, order processing, documentation, and after-sales service—is located in the Liaocheng Economic and Technological Development Zone, serving as the hub for global client relations, order negotiations, and cross-border services. Our production facility is situated in Chiping District, Liaocheng City, and specializes in the R&D, smelting, processing, and testing of white fused alumina, brown fused alumina, and other fused alumina products. This allows us to manage the entire supply chain—from primary production and rigorous quality control to direct export.


Q2: What is your production capacity and supply capability? Can you ensure a stable, long-term supply?
Our production base in Chiping features mature production lines and comprehensive processing equipment, enabling large-scale, continuous manufacturing. We offer a stable supply of our full range of white fused alumina, brown fused alumina, and related fused alumina products. With ample inventory and well-organized production scheduling, we are fully equipped to handle bulk orders, recurring annual orders, and urgent requests during peak seasons, ensuring a reliable, long-term supply for our global clients.


Q3: What are your primary export products, and what are your core offerings?
Our core exports consist of three main series of fused alumina materials: brown fused alumina, white fused alumina, and other fused alumina products. We offer a comprehensive range of specifications and particle sizes that meet various international procurement standards. Brown fused alumina is our flagship product for cost-effective industrial abrasives and refractory raw materials; white fused alumina is designed for high-purity, high-precision grinding and polishing applications; and our broader fused alumina line serves high-end refractory, specialty ceramic, and precision abrasive tool sectors—covering the full spectrum of procurement needs across all market tiers.


Q4: What are the specific applications for these three types of fused alumina, and how should one choose the right product? 1. Brown Fused Alumina: Characterized by high toughness, excellent wear and impact resistance, and a strong price-performance ratio. It is suitable for general industrial applications such as metal sandblasting (rust removal), hardware grinding, the manufacturing of grinding wheels and sandpaper, metallurgical castable refractories, and lining materials for standard industrial furnaces. It serves as a versatile, all-purpose abrasive and refractory raw material.

2. White Fused Alumina: Features high purity, high hardness, and excellent self-sharpening properties, with a pure white appearance free from impurities. It is ideal for high-precision and high-cleanliness applications, including the polishing of precision molds, grinding of aerospace components, finishing of electronic materials, and the production of high-end refractory products and precision ceramics.

3. Fused Alumina (High-Purity/Specialized): Possesses a dense structure, exceptional thermal stability, and high resistance to both heat and corrosion. It serves as a core raw material for high-end, specialized refractories, structural ceramics, precision grinding media, and linings for high-temperature industrial kilns, making it well-suited for demanding, high-performance operating environments.

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