About Attapulgite Catalyst Binder Grade
Attapulgite catalyst binder grade is a finely milled clay used to bind zeolites, molecular sieves, activated alumina and other active powders into extrudates, beads and pellets. The active phase does the chemistry; the binder holds the shape, and it has to do so without blocking access to the pores.
The needle morphology of attapulgite suits this role. When wetted and kneaded, the needles give the paste plasticity, so it extrudes smoothly and holds its form on the belt or in the pan granulator. Green bodies gain handling strength as they dry. After calcination the clay forms a rigid, open framework that contributes crush strength and attrition resistance while leaving transport pathways to the active sites. Compared with platy binders, the fibrous network can deliver strength at moderate binder levels, which helps keep the proportion of active material high.
Obsidian Minerals supplies this grade with controlled fineness and low residue above 75 µm, protecting extrusion dies and avoiding defects in small-diameter beads. Moisture and major oxide chemistry are monitored batch by batch and reported on the Certificate of Analysis, so formulators can hold water addition and calcination schedules steady from lot to lot. We can adjust particle size to suit your forming process and supply samples on request for trials.
Typical specifications
| Parameter | Typical Value | Test Method |
|---|---|---|
| Free moisture (105 °C) | 8–12 % | Internal method |
| Residue greater than 75 µm | ≤ 2.0 % | Wet sieve, internal method |
| SiO₂ | 55–65 % | XRF |
| Al₂O₃ | 8–12 % | XRF |
| MgO | 7–11 % | XRF |
| Fe₂O₃ | 3–6 % | XRF |
| pH (10 % slurry) | 7.5–9.5 | Internal method |
Typical values for guidance. Guaranteed limits are stated on the Technical Data Sheet and batch CoA. Chemistry is reported on an as-received basis unless otherwise agreed.
Key features & benefits
Plastic, extrudable paste
Wetted attapulgite develops plasticity that lets zeolite and alumina pastes pass through dies smoothly and keep their profile, reducing cracking, slumping and lamination in extrudates and pellets.
Green and calcined strength
The fibrous network gives dried bodies enough strength to survive handling and, after calcination, a rigid framework that contributes to crush strength and attrition resistance in service.
Open pore access
Needle-shaped particles pack loosely compared with platy clays, so the binder matrix leaves diffusion pathways to the active phase instead of sealing pores at the particle surface.
Low grit for fine forming
Controlled residue above 75 µm limits the abrasive oversize particles that wear extrusion dies and cause surface defects in small beads, supporting consistent shape and size distribution.
Lot-to-lot chemistry control
Moisture and major oxides are reported on each batch CoA, helping formulators keep water addition, binder ratio and calcination profile stable over long production campaigns.
Applications
Molecular sieve beads and pellets
Used as the clay binder in 3A, 4A and 13X type molecular sieve beads and extrudates for gas drying and purification, where a strong, porous body is needed.
Extruded and pelletised catalysts
Binds active catalyst powders into cylinders, trilobes or pellets for refining and petrochemical service, providing mechanical integrity while the active phase carries out the reaction.
Adsorbent and desiccant granules
Forms granules from activated alumina, silica and other adsorbent powders, giving them the handling strength and attrition resistance needed in packed beds, cartridges and compressed-air drying columns.
Usage & handling
- Typical binder loading is 10–25 % of the dry blend, optimised in trials against crush strength and activity targets.
- Dry-blend the attapulgite with the active powder before adding water, then knead or mix to a uniform, plastic paste.
- Adjust water addition to the moisture shown on the batch CoA to keep paste consistency constant between lots.
- Calcine according to the active phase requirements; the binder contribution to strength develops during this step.
- Store sealed bags in a dry area to prevent moisture pick-up before use.
Packaging & supply
- 25 kg or 50 kg HDPE or paper bags
- 1 MT or 1.2 MT FIBC jumbo bags for automated batching
- Custom packaging and private labelling on request
Frequently asked questions
Why use attapulgite as a catalyst binder?
Attapulgite combines good paste plasticity for forming with a porous, rigid matrix after calcination. Its needle-shaped particles interlock to provide strength without packing densely, so access to the active phase is preserved. It is widely used to bind molecular sieves and other adsorbents and catalysts into beads, extrudates and pellets, often at lower binder levels than platy clays would need.
What binder loading is typical for attapulgite in molecular sieve beads?
Binder levels for molecular sieve and catalyst bodies commonly fall in the range of about 10 to 25 % of the dry mix. The right figure depends on the active powder, the forming method and the strength needed in service. We recommend running a short ladder of binder levels during trials and measuring crush strength and adsorption capacity together.
Can the particle size of the catalyst binder grade be adjusted?
Yes. Fineness and the residue limit above 75 µm can be tailored to your forming process, for example finer material for small-diameter beads or thin-wall extrudates. Share your current binder specification and process details, and we will propose a matched grade and supply samples on request for evaluation.
Is chemical composition reported for each batch of attapulgite binder?
Yes. Each batch Certificate of Analysis reports moisture and the parameters agreed in the specification, which can include major oxides determined by XRF. Testing is carried out in an NABL-accredited laboratory. If your process is sensitive to specific elements, such as iron or alkali content, discuss the limits with us before ordering.