Solutions · Alumina & ATH Storage
Alumina is hard and abrasive, ATH is a fine, dusty filler powder. PW Silo Systems designs aluminum and stainless steel silos for aluminum oxide, aluminum hydroxide, and hydrotalcite with you – with mass-flow discharge, discharge aids, and dust collection for your grade.
Alumina & ATH Storage at a Glance
An alumina silo stores aluminum oxide close to production – for ceramics, refractories, abrasives, catalysts, or other industrial processes. An ATH silo stores aluminum hydroxide, which is widely used as a flame-retardant filler in plastics, cables, rubber, and coatings. Both feed the product in a controlled way to dosing, weighing, and mixing.
Alumina is hard and wears the outlet and conveying equipment. ATH and hydrotalcite are fine powders that dust and can bridge. Silo geometry, discharge aids, wear protection, and dust collection are therefore designed together with you for your grade and your site.
Why Alumina & ATH Are Demanding
Abrasion, fine particles, and dust decide whether an alumina or ATH silo runs reliably.
Aluminum oxide is a very hard material. It wears the outlet, discharge equipment, and conveying lines.
ATH and fine alumina grades create dust during pneumatic filling and conveying that settles on equipment and surroundings.
Fine ATH and hydrotalcite powders compact under their own weight and build bridges or narrow flow channels above the outlet.
For white fillers and high-purity applications, flaking coating or rust must not end up in the product.
Particle size and properties can vary from delivery to delivery – and show up in the compound or the end product.
Different alumina grades, ATH, and other fillers must not be mixed by accident.
Silo Materials
We build silos exclusively in aluminum and stainless steel. Carbon steel is not an option for us: its coating is the only protection against corrosion – and flaking coating or rust can end up in your product.
Which of our two materials fits your alumina or ATH silo depends on the grade, its abrasiveness, your process, and your site. We select the material and the design with you.
Your Alumina And Ath Silo System
Silo, discharge, blending, filtration, and monitoring are engineered as one system. That means fewer interfaces for your team and components that are designed to work together.
Storage
Concentric mass-flow discharge without asymmetric flow zones – as standard, site-assembled, indoor, or multi-compartment silos.
Learn moreBlending
Gravity blending and homogenizing with four technologies, including PW ConeBlend with a hopper that is quick to clean.
Learn moreDischarge
Air fluidization for uniform discharge of poorly flowing products – prevents bridging and can be retrofitted to existing silos.
Learn moreDischarge
Vibration from unbalanced motors breaks up cohesive forces, resolves caking, and keeps the outlet clear.
Learn moreFiltration
Dust separation during pneumatic filling and conveying – sized for fine powders.
Learn moreMonitoring
Level measurement for reliable monitoring of the silo content – so you know when to reorder.
Learn moreAlumina, ATH & Related Products
Products marked “Tested in our lab” are on our list of bulk materials. The others we review with you based on your material data before designing the silo.
Tested in our lab
Aluminum oxide, alumina, Al₂O₃
Aluminum oxide is on our list of bulk materials tested in our lab. Its hardness is considered at the outlet and in conveying.
Tested in our lab
Aluminum hydroxide, aluminum trihydrate, ATH
Aluminum hydroxide is on our tested list. Discharge aids and dust collection are planned for this fine filler powder.
Tested in our lab
Hydrotalcite, layered double hydroxide
Hydrotalcite is on our tested list. Outlet and discharge are designed for its fine particles.
Review with us
Magnesium hydroxide, MDH
Magnesium hydroxide is also used as a flame-retardant filler. We review your product data with you before designing the silo.
Review with us
Boehmite, aluminum oxide hydroxide
Boehmite grades differ in particle size and flow behavior. We review your material data with you.
Review with us
Calcined alumina, tabular alumina, reactive alumina
Calcined and tabular grades differ in grain size and abrasiveness. We review the right design with you.
Also tested in our lab:
Send us your material data and we will review the right solution with you:
Product Check
Type in your product or any other bulk material to see whether it has already been tested in our lab. The list covers 287 bulk materials.
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Service in the U.S.
With more than 40 years of experience in silo engineering, we support your alumina or ATH silo project from the first design discussion to commissioning. We deliver to every U.S. state and install with our own qualified personnel.
FAQ
Answers to the questions plant managers, engineers, and buyers ask most often about storing aluminum oxide, aluminum hydroxide, and hydrotalcite in silos.
Dry alumina and ATH products can be stored in a properly designed silo. These products are on our list of bulk materials tested in our lab:
Magnesium hydroxide, boehmite, calcined alumina, and other products we review with you based on your material data.
Aluminum oxide is a very hard material. Wear at the outlet, in discharge equipment, and in conveying is considered in the design – we review the right solution with you for your grade and your throughput.
ATH is a fine, cohesive powder. It compacts under the weight of the silo content and builds bridges or rat-holes above the outlet. A mass-flow hopper geometry, PW SpeedBlow air fluidization, and bin activators keep it moving. The right combination depends on your grade.
Integrated filters and PW FilterLine dust collectors separate dust during pneumatic filling and conveying. Filter size and venting are matched to your filling rate and your product.
In mass flow, the entire silo content moves downward when material is discharged – not just a channel in the center. Your alumina and ATH leaves the silo in the order it came in (first in, first out), and no product is left behind in dead zones. Our PW StoreLine silos are designed for concentric mass-flow discharge without asymmetric flow zones.
We build silos exclusively in aluminum and stainless steel – never in coated carbon steel, so no flaking coating or rust can contaminate your product. Which of our two materials fits depends on the grade, its abrasiveness, your process, and your site. We select it with you.
The right size depends on your daily consumption, delivery intervals, the number of products, and the space available at your site. PW StoreLine silos are available in a wide range of sizes and diameters, and silos too large for road transport are assembled on site. We size the system with you – without oversized investment.
Yes. We deliver to every U.S. state and support your project with silo transport, field assembly, silo installation and supervision, and site relocation of existing systems.
Very likely. Our silo systems are designed for nearly all free-flowing, granular, and powdered bulk solids. Send us your material details – particle size, bulk density, moisture, and how the product is filled and discharged – and we will review the right storage solution with you.
Tell us about your products, required storage capacity, how the silo is filled and discharged, and your site conditions. Based on this, we work out the material, silo type, and configuration with you and send you a detailed quote.
