Activated Alumina Balls - High-Strength Desiccant for Air Compressor Drying and Adsorption

Activated Alumina Balls - High-Strength Desiccant for Air Compressor Drying and Adsorption

Alumina balls (Al2O3) are used in six main applications due to their high hardness, wear resistance, high temperature resistance, chemical stability, and high specific surface area. These include grinding media, catalyst carriers, adsorption drying, chemical fillers, high-temperature insulation, and electronic thermal conductivity and insulation. Different content/porosity values ​​cater to different applications.

1. Grinding Media (92%/95%/99% High-Purity Dense Alumina Balls)

- New Energy: Ultrafine grinding of ternary/lithium iron phosphate cathodes and graphite anodes for lithium batteries, resulting in uniform particle size, low iron content, and low pollution.

- Electronic Ceramics: Grinding and polishing of ceramic capacitors, semiconductor silicon powder, and piezoelectric ceramics.

- Non-Metallic Minerals: Ultrafine processing of quartz, kaolin, calcium carbonate, and talc (coating/paper grade).

- Chemicals/Coatings/Inks: Wet grinding and dispersion of pigments, dyes, and pesticides.

- Mining/Metallurgy: Grinding iron ore and non-ferrous metal ores, wear ≤0.05%, more durable than steel balls.

- Food and Pharmaceutical: Grinding pharmaceutical excipients and food colorings, meeting hygiene standards.

- Features: Mohs hardness 9, density 3.5–3.9 g/cm³, zero porosity, wear-resistant and non-polluting.

2. Catalyst Support (Activated Alumina Balls, Porous with High Specific Surface Area)

- Petrochemical: Hydrocracking, catalytic cracking (FCC), reforming reactions, supporting precious metals such as Pt/Pd/Ni.

- Environmental Exhaust Gas: Automotive three-way catalytic converter, converting CO, HC, and NOₓ; industrial waste gas desulfurization and denitrification.

- Fertilizer/Coal Chemical: Catalyst support for ammonia synthesis, methanol, and hydrogen production reactions.

- Features: Porous, large specific surface area, thermally stable, acid and alkali resistant.

3. Adsorption and Drying (Activated Alumina Balls)

- Gas Drying: Deep drying of compressed air, natural gas, CO₂, and O₂ (dew point down to -70℃).

- Water Treatment: Defluorination of high-fluoride water, removal of arsenic, removal of heavy metals such as Pb/Hg/Cd, decolorization and deodorization of industrial wastewater.

- Oil and Gas Recovery: Adsorption of hydrocarbons and lubricating oil vapors in oil and gas.

- Regeneration: Regeneration at 175–315℃, recyclable.

4. Chemical Tower Packing (Inert Alumina Ceramic Balls, High Strength, Low Porosity)

- Petroleum/Refining: Catalyst support, gas-liquid distribution, and erosion prevention in distillation towers, absorption towers, and reactors.

- Natural Gas Purification: Desulfurization/decarbonization tower packing, corrosion resistant, high strength (compression resistance ≥40kN/ball).

- Coal Chemical Industry: Gasifier and shift converter packing, resistant to high temperature and pressure.

5. High-Temperature Insulation and Heat Storage (Hollow Alumina Spheres/Heat Storage Spheres)

- Industrial Kilns: Insulation layers for steel, ceramic, glass, and cement kilns, withstanding temperatures above 1600℃, saving energy and reducing consumption.

- Heat Storage and Exchange: Heat storage materials for RTOs and hot blast stoves, with large heat capacity and high heat exchange efficiency.

- Lightweight Refractory Materials: Reduce furnace weight and extend lifespan.

6. Electronic and Thermal Insulation (High-Purity Alumina Spheres)

- Electronic Heat Dissipation: Thermally conductive filler for LEDs, power devices, and battery packs, improving heat conduction uniformity.

- Insulating Encapsulation: Insulating filler for high-voltage devices and sensors, resistant to breakdown and high temperatures.

7. Specifications

- Grinding: Select 95%/99% high-purity dense spheres, particle size Φ1–20mm.

- Catalysis/Adsorption: Select activated alumina spheres (φ2–5mm).

- Tower Packing: Select inert ceramic spheres (φ10–50mm). - Thermal insulation and storage: Select hollow/porous heat storage balls.

8. Activated alumina used in injection molding machines is mainly used as a desiccant to absorb moisture from compressed air and plastic granules, preventing product problems.

The pneumatic system of injection molding machines (valves, cylinders, robotic arms, material blowing, and demolding air) all rely on compressed air.

- White porous activated alumina balls installed in adsorption dryers

- Function: Powerful water absorption and drying of compressed air

- Effects:

- Dry air → Cylinders do not rust, valves do not jam, robotic arms are stable

- Low moisture content → Longer lifespan of pneumatic components, less maintenance

- Specifications: Generally φ3–5mm activated alumina balls

Alumina balls are used for:

- Desiccant in hot air drying circuits (used in conjunction with molecular sieves)

- Adsorbing water vapor evaporated during the drying process

- Making hot air circulation drier, drying efficiency higher, and plastics drier

- Modification of some engineering plastics: Alumina balls are ground into powder and added to plastics for thermal conductivity, wear resistance, and reinforcing filler

- Injection molding machines generally do not use balls, but use Alumina Powder.

Injection molding machine → Compressed air dryer, plastic dryer → Activated alumina balls = Water absorption and drying → Stable air path, bubble-free plastics, good product quality.

- Activated alumina balls φ3–5mm (for dryers)

- Selling points: High strength, high water absorption, recyclable, non-powdering, protects pneumatic components, improves injection molding yield