Powder
Extra fine
The finest milled grade, maximizing available surface per unit mass for fast uptake.
- Dosing into biological stages
- Suspension (stirred) treatment
- Flue and waste gas injection
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- HOK® Activated Lignite
The product
HOK® Activated Lignite
A porous carbon sorbent produced continuously from Rhenish lignite by RWE in Germany — established over decades as a cost-effective material for water and gas treatment.
Overview
One product, made one way, for one purpose.
HOK® takes its name from the rotary hearth furnace — the Herdofen — in which it is produced.
Most activated carbons begin life as purchased feedstock (coconut shell, hard coal, wood) that passes through separate carbonization and activation steps. HOK® is different: it is produced continuously from freshly mined Rhenish lignite at the source, in a single integrated process. The result is a sorbent with a consistent, repeatable character — and a cost position that has kept it competitive in industrial environmental duty for decades.
- Single source, single process — produced at the manufacturer's own site from its own raw material
- Continuous production — not batch-dependent, supporting stable quality between deliveries
- Documented in service — long operating history in wastewater and flue gas treatment across Europe
Powder
Dosing & suspension
Fine grades for biological stages.
Granulate
Fixed beds & filters.
ISO 9001Certified quality system
Raw material
Freshly mined Rhenish lignite, processed at the source.
How it's made
From lignite seam to sorbent.
Production begins where the raw material is mined — no purchased feedstock, no intermediate handling between the seam and the furnace.
Rhenish lignite
Freshly mined lignite from the Rhenish mining area is dried and prepared.
Rotary hearth furnace
The Herdofen carbonizes and activates the material in one continuous step, developing its pore structure.
Grading & dispatch
The activated product is milled or screened into four particle-size grades and packed for delivery.
Product grades
Four grades, powder to granules.
The same activated lignite, offered in particle-size grades that match how it will be applied — dosed as a powder, stirred in suspension, or packed as a bed.
Powder
Fine
A standard powder grade balancing kinetics with easier handling and dosing behavior.
- Biological wastewater treatment
- Adsorptive polishing stages
- Gas stream treatment
Granulate
Fine granules
Small granules for compact beds where pressure drop and contact time must be balanced.
- Smaller fixed-bed adsorbers
- Filter media
Granulate
1.25–5 mm
The coarse grade for full-scale fixed beds and filters with long service intervals.
- Fixed-bed adsorbers
- Drinking water filtration
- Gas cleaning beds
[Exact particle-size distributions and grade designations per the current RWE datasheet — request the datasheet for the grade you intend to use.]
Technical data
Typical reference values.
Indicative values summarized from the manufacturer's published documentation. They describe the product family, not a specification for any single delivery.
| Property | Typical value | Notes |
|---|---|---|
| Raw material | Rhenish lignite | Mined and processed at the manufacturer's own site |
| Production route | Rotary hearth furnace | Continuous carbonization and activation in one step |
| BET surface area | approx. 300 m²/g | Large internal surface relative to cost |
| Particle-size range | Powder to 5 mm granules | Four grades; see product grades |
| Quality system | ISO 9001 | Certified management system at the production site |
| Quality control | Multiple samples daily | Analyzed in the manufacturer's laboratory |
1 stepContinuous carbonization and
activation in the rotary hearth furnace
4Particle-size grades from extra-fine
powder to coarse granulate
ISO 9001Certified quality system at
the production site in Germany
DailySampling and laboratory analysis
during production
Values above are indicative and rounded. For engineering or compliance use, request the current datasheet and safety data sheet through our contact page.
Packaging & supply
Delivered the way your site receives material.
Packaging and logistics are arranged per order — from silo truck deliveries for high-volume dosing to palletized big bags for smaller or intermittent duty.
Tell us your duty and volumes
Application, expected consumption, and how your site can receive and store material.
We confirm grade and format
Grade recommendation with the manufacturer's documentation, plus packaging and delivery options.
Supply begins
Scheduled deliveries with the consistency of an industrial-scale, quality-certified production source.
High volume
Bulk / silo truck
Pneumatic delivery into site silos for continuous dosing operations.
Standard
Big bags
Palletized FIBC big bags for batch dosing, trials, and smaller installations.
Export
Container delivery
Containerized shipments for North American supply, scheduled around your consumption.
Next step
Request the datasheet for your grade.
Tell us your application and we'll send the manufacturer's current datasheet and safety data sheet, with grade guidance for your duty.