Rongjian manufactures activated alumina balls in desiccant and catalyst-carrier grades. Made by dehydroxylating aluminium hydroxide into a highly porous white sphere, activated alumina carries a surface area of 260 to 305 m²/g and a strong affinity for water, which makes it a deep desiccant for gases and a defluoridation media for water.
As a desiccant it dries compressed air, cracked gas, ethylene and propylene to a dew point below -70°C and runs in pressure-swing units. As a water media it removes fluoride and arsenic from drinking water. The catalyst-carrier grade, at 94% Al₂O₃, supports active metals in petrochemical and FCC catalysts. We supply balls of 3 to 5 mm and 4 to 6 mm, in bulk.
Typical specifications for Rongjian activated alumina, in desiccant and catalyst-carrier grades. Other ball sizes, from 1 to 10 mm, are available on request.
| PARAMETER | DESICCANT GRADE | CATALYST-CARRIER GRADE |
|---|---|---|
| Al₂O₃ | 95 wt% | 94 wt% |
| SiO₂ | 0.02 wt% | 0.02 wt% |
| Fe₂O₃ | 0.029 wt% | 0.02 wt% |
| Na₂O | 0.29 wt% | 0.35 wt% |
| Form & Size | White balls, 3–5 & 4–6 mm | White balls, 3–5 mm |
| Bulk Density | 0.55–0.73 g/cm³ | 0.55–0.63 g/cm³ |
| Crush Strength | 100–210 N/pc | 100 N/pc |
| Specific Surface | 260–305 m²/g | 260 m²/g |
| Total Pore Volume | 0.5 cm³/g | 0.5 cm³/g |
| Attrition | ≤0.1 wt% | ≤0.1 wt% |
Activated alumina earns its place in two ways, as a deep desiccant and as a high-surface adsorbent and support. The four duties below cover most of what buyers order it for.
We have made activated alumina since 2010, out of Jiangxi in China, and ship it by the tonne into compressed-air driers, oxygen plants, water-defluoridation systems and catalyst makers. Because we run both grades, the alumina is matched to the duty rather than forced to fit one stock product.
We hold the desiccant and catalyst-carrier grades as white balls and adjust size, grade and packing to the order. Standard supply runs from small bags up to bulk bags and drums, with the test report shipped against every batch.
The alumina is supplied as hard, white spherical balls, typically in the 3 to 5 mm and 4 to 6 mm sizes, with other sizes to order. A smaller ball packs more surface area and adsorbs faster but costs more pressure drop; a larger ball flows and drains more freely. The spherical shape gives an even bed with low dust and good flow, and the size is picked to suit the vessel and the gas or liquid rate.
Activated alumina earns its place in three roles. As a desiccant it dries compressed air and gases down to a low dew point and regenerates with heat; in water it adsorbs fluoride, the standard media for defluoridation of drinking water; and as a carrier it supports catalyst and runs as the Claus catalyst in sulphur recovery. We set the grade to the role, since a drying bed and a defluoridation bed are not asking the same thing of the alumina.
The alumina ships in bulk, from small bags for a trial up to bulk bags and drums by the tonne, factory-direct. Because it is fired and graded here, a large order runs to one consistent grade rather than a blend of lots, and the packing is set to how the bed is loaded. Send the grade, the size and the quantity and the supply and packing are built around the order.
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Activated alumina is used for deep drying and for adsorption. As a desiccant it dries compressed air and gases to a very low dew point, as a water media it removes fluoride and arsenic, and as a carrier it supports active metals in catalysts. The same high-surface alumina does all three.
Both are desiccants, but activated alumina dries to a lower dew point and resists liquid water without breaking down, while silica gel holds more water at high humidity and costs less. Activated alumina suits compressed-air and process drying, and it also removes fluoride, which silica gel does not.
Yes. Activated alumina is the standard media for fluoride removal from drinking water, and it also takes out arsenic. Water flows through the bed, the contaminant binds to the alumina surface, and the media is recharged when its capacity runs out.
As a compressed-air and gas desiccant, activated alumina reaches a dew point below minus seventy degrees under proper operating and regeneration conditions. That is dry enough for instrument air, cracked gas and most process duties.
Yes. Activated alumina is regenerated by heating or by lowering pressure, which drives off the adsorbed water and restores the capacity. In water service the media is recharged chemically. A single charge serves many cycles before replacement.
Yes. We ship by the tonne, factory-direct from Jiangxi, in bags, bulk bags and drums, with the quantity and packing set to your order and a test report against every batch.
Activated alumina is aluminium oxide with a huge internal surface, built by driving the water out of aluminium hydroxide. That surface gives it two jobs: it pulls water out of gases as a desiccant, and it binds contaminants out of liquids as an adsorbent. The grade and ball size are matched to the job.
Activated alumina is a deep desiccant for compressed air and process gas. It reaches a dew point below minus seventy degrees, holds up if liquid water hits the bed, and regenerates by heat or by dropping pressure. It dries cracked gas, ethylene and propylene in petrochemical plants and instrument air across industry. Larger balls give a lower pressure drop in big driers, while smaller balls give more surface for a compact bed.
In water treatment, activated alumina is the established media for removing fluoride, and it also takes out arsenic. The contaminant binds to the alumina surface as water flows through a fixed bed, and the bed runs until its capacity is used, when the media is recharged with a regenerant or replaced. High surface area and pore volume are what give a long run between recharges.
The catalyst-carrier grade, at high alumina content, is the support that active metals sit on. Its stable pore structure spreads the metal evenly and survives the heat, pressure and space velocity of a reactor, which is why it is used in FCC and other petrochemical catalysts and in supported metal catalysts for fine chemicals.
Both are common desiccants, and the choice comes down to the duty. Activated alumina dries to a lower dew point, tolerates liquid water and removes fluoride, so it suits compressed-air systems and water treatment. Silica gel holds more water at high humidity and costs less, so it suits packaging and general moisture control. Many compressed-air driers layer the two to combine bulk capacity with a low outlet dew point.
