Pure Bentonite Clay Powder Factory Price
Pure Bentonite Clay Powder – Factory Price Overview
Bentonite is a naturally occurring clay composed primarily of the smectite mineral montmorillonite, formed from the alteration of volcanic ash in marine environments. Its defining characteristic is the ability to swell and absorb water, which stems from the layered structure of montmorillonite crystals and the exchangeable cations between layers.
Industrial buyers evaluate purity by measuring the montmorillonite content, typically ranging from 70% to 90% for high‑grade material, and tracking impurity oxides such as Fe₂O₃ (<0.5%), SiO₂ (<5%), and Al₂O₃ (<24%). Lower impurity levels translate to higher swelling capacity and more predictable rheological behavior in downstream processes.
Factory price is influenced by three main cost drivers: mining and transportation of raw bentonite, energy consumption during drying (often 150‑200 °C to reach <10 % moisture), and milling to achieve target particle size distributions. A finer D50 (<5 µm) generally increases unit cost due to additional grinding time, while higher moisture content raises shipping weight and reduces effective solids.
Key Technical Specifications
| Property | Typical Value |
|---|---|
| Montmorillonite content | 70‑90 % |
| Moisture (as‑received) | 5‑10 % |
| Particle size D50 | 3‑8 µm (adjustable) |
| pH (10 % slurry) | 8.5‑9.5 |
| Cation exchange capacity (CEC) | 70‑100 meq/100 g |
| Specific gravity | 2.4‑2.6 |
| Loss on ignition (LOI) | 8‑12 % |
Primary Industrial Applications
In oil‑based drilling fluids, bentonite provides viscosity and suspension properties that cut transport costs; a yield point of 10‑15 lb/100 ft² is typical for a 4 % bentonite slurry at 120 °F.
Foundries use bentonite as a binder for green sand molds; the compressive strength after molding ranges from 0.15‑0.25 MPa, directly related to the clay’s montmorillonite fraction and moisture level.
For cat litter and absorbent products, the swelling index (volume increase after saturation) exceeds 15 × dry volume, granting high liquid retention while maintaining low dust generation when particle size is kept above 2 µm.
Civil engineering applications rely on bentonite slurry walls for low permeability (<1×10⁻⁹ m/s) and thixotropic recovery; these performance metrics are achievable when the slurry maintains a solids content of 4‑6 % and a pH above 8.
Quality Control & Testing
Each batch undergoes a standardized test suite: laser diffraction for particle size distribution (ASTM D4464), gravimetric moisture analysis (ASTM D2216), methylene blue capacity for CEC (ASTM D422), and X‑ray diffraction to confirm montmorillonite purity. Acceptance criteria are documented in the product data sheet and can be tightened per customer request.
Trace metal analysis (ICP‑OES) ensures that elements such as lead, cadmium, and arsenic remain below 10 ppm, meeting RoHS and REACH thresholds for applications that require environmental compliance.
Packaging & Shipping Options
- 25 kg multi‑wall paper bags with inner polyethylene liner, palletized 40 bags per pallet (1 t).
- 500 kg bulk bags (FIBC) with spout top and discharge bottom, suitable for pneumatic conveying.
- Loose bulk in 20‑ft or 40‑ft containers, loaded with moisture‑proof liners and desiccant bags to maintain <8 % moisture during transit.
All packaging options include a humidity indicator card and a certificate of analysis (CoA) referencing the specific batch number.
Frequently Asked Questions
Can the particle size be customized? Yes, milling parameters are adjusted to achieve D50 values from 2 µm to 15 µm based on end‑use requirements.
What information is needed for a quotation? Required details include target quantity, desired particle size range, moisture tolerance, packaging preference, and delivery destination.
How is product consistency assured across batches? Statistical process control (SPC) monitors key parameters (montmorillonite content, moisture, pH) with control limits set at ±2 σ; batch‑to‑batch variation is typically <5 % for these metrics.
Request a Quote
To receive a factory‑price quotation for pure bentonite clay powder, please provide your specifications via the inquiry form. Our technical team will respond with a detailed cost breakdown, lead time, and sample availability within one business day.
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