Diatomaceous Earth Bulk Supply – Technical Overview

Diatomaceous earth (DE) is a sedimentary rock composed of fossilized diatom frustules, primarily amorphous silica. Its high porosity and inert nature make it suitable for filtration, absorption, and as a functional filler in various industrial processes. Understanding the technical attributes that influence bulk pricing helps procurement engineers evaluate total cost of ownership.

Material Composition and Typical Properties

The mineral typically contains 80‑90 % SiO₂, with the remainder consisting of aluminum oxide, iron oxide, and trace alkaline earth metals. Loss on ignition (LOI) is generally below 6 %, indicating low organic content. Particle size distribution is often expressed as D50 ranging from 5 µm for fine filter grades to 45 µm for coarser absorbent grades. Specific surface area can vary between 15 m²/g and 40 m²/g depending on calcination temperature and grade.

Factors Influencing Bulk Price

Bulk pricing is driven by grade classification (food, filter, industrial), required particle size, moisture content, and order volume. Additional considerations include transportation distance, packaging type, and any required certifications such as FDA or NSF approval. Suppliers usually quote price per metric ton for lot sizes exceeding ten tons, with adjustments for smaller quantities.

Typical Specification and Price Ranges

Values are typical; actual pricing depends on project‑specific requirements and should be confirmed via quotation.

Industrial Applications and Rationale

• Filtration of beverages and pharmaceuticals – DE’s rigid, porous structure forms a permeable cake that retains fine particulates while allowing high flow rates.
• Spill absorption in petrochemical facilities – its high surface area and low density enable rapid uptake of hydrocarbons without chemical reaction.
• Functional filler in paints and coatings – the inert silica particles improve viscosity control and reinforce film hardness without affecting color.
• Carrier for pesticides and fertilizers – DE’s absorptive capacity stabilizes active ingredients and reduces dusting during application.
• Thermal insulation in lightweight concretes – the trapped air within diatom frustules lowers thermal conductivity while maintaining compressive strength.

Quality Control Philosophy

Manufacturers verify grade conformity through systematic testing: X‑ray fluorescence for SiO₂ content, laser diffraction for particle size distribution, thermogravimetric analysis for LOI, and sieve analysis for oversize fraction. Heavy metal screening (Pb, As, Cd) is performed when food or pharmaceutical grades are required. Batch traceability is maintained from raw ore extraction to final packaging.

Packaging and Delivery Options

• 25 kg multi‑wall paper bags with polyethylene inner liner – suitable for small‑scale laboratory or pilot plant use.
• 500 kg flexible intermediate bulk containers (FIBCs) with UV‑stabilized fabric – standard for most industrial consumers.
• Bulk tanker truck or railcar – employed for continuous supply to large filtration plants, minimizing handling.
• All packaging options include moisture‑barrier protection and are labeled with batch numbers and safety data sheets.

Frequently Asked Questions

To obtain a detailed quotation tailored to your project’s technical and logistical parameters, please contact our technical sales team.