Walnut Shell Fuel Supply
Walnut shells — the hard shells left when walnuts are cracked and the kernels removed — are a clean solid biomass fuel with low ash and a high calorific value. Biyolink collects shells from walnut cracking plants, verifies them with laboratory analysis and delivers them to industrial plants in bulk or in big bags — and buys from producers who have shells to sell.
What Are Walnut Shells and Where Do They Come From?
A walnut has a fleshy green husk, removed at harvest, and beneath it a hard shell, which is separated from the kernel at cracking plants. The fuel is this hard shell. Roughly half the weight of an in-shell walnut is shell, and cracking breaks it into large, irregular pieces.
Walnut growing is spread across Türkiye; the leading provinces are Denizli, Bursa, Kahramanmaraş, Mersin, Manisa and İzmir. The harvest is in September–October; cracking is busiest in the following months but continues through the year, so shells are available for most of it. Because supply is not concentrated in one region, regular orders draw on several plants.
Typical Technical Values
| Property | Typical value |
|---|---|
| Net calorific value | About 3,800–4,300 kcal/kg depending on moisture |
| Moisture | 8–12% |
| Ash | 0.5–3% |
| Bulk density | Similar to wood chips; varies with piece size |
| Form | Bulk, broken hard shells |
These are typical ranges from published sources; actual values vary by lot, source and moisture. We share a laboratory analysis of every lot with our quote.
What Are Walnut Shells Used For?
Ground and graded walnut shell is used as a soft abrasive for blasting and polishing, as a lost-circulation material in oil and water well drilling and as a filter medium in water treatment; it is also a raw material for activated carbon and cosmetic scrubs. As a fuel, low ash and a high calorific value make walnut shells well suited to automatically fed boilers. Their ash can melt at lower temperatures than wood ash, so blending with wood is advisable in boilers that run hot.
- Steam and hot-water boilers (textiles, food, paper)
- Biomass power plants and cement kilns
- Greenhouses, drying plants and central-heating boilers
- Raw material for blasting and filter media
Transport and Delivery
Walnut shells travel in bulk on tipper or walking-floor trailers, or in big bags. The pieces are large and irregular, so trucks often fill by volume before weight, and the way the shells are broken affects the tonnage per run. They should be covered in transit and stored indoors to keep them dry. Every shipment is recorded with a waybill and a weighbridge ticket.
What Determines the Price of Walnut Shells?
The price per tonne is not fixed; it changes with the cracking season and the lot. We build our quote around:
- Moisture and ash (laboratory analysis)
- Cleanliness: kernel fragments, dust and foreign matter
- Volume, delivery schedule and form (bulk or big bags)
- Distance to the delivery point and market supply
Looking for a Buyer for Walnut Shells?
Biyolink buys the walnut shells from your cracking plant or warehouse. Sign up to the marketplace for free and list them; we will look at the volume and any analysis values and send you our price. We plan the haulage.
Frequently Asked Questions
What is the calorific value of walnut shells?
Published sources give a net calorific value of about 3,800–4,300 kcal/kg depending on moisture. The exact value varies by lot; we share a laboratory analysis of every lot with our quote.
Do walnut shells burn well?
Yes. Walnut shells burn well in stoves and central-heating boilers built for solid fuel and leave little ash. In industry they are used in automatically fed grate boilers and fluidised-bed systems; the piece size must suit the feeding system, and because the ash can melt at relatively low temperatures, blending with wood helps in boilers that run hot. Biyolink supplies walnut shells at industrial scale, in bulk or big bags.
How are walnut shells used for blasting?
Blasting media is walnut shell that has been crushed, ground and graded to set particle sizes; it is a soft abrasive that cleans metal, wood and engine parts without scratching the surface. Biyolink supplies raw walnut shells in bulk; grinding and grading are done by the processing plant.
Are green walnut husks the same as walnut shells?
No. The green husk is the fleshy, moist outer layer removed at harvest, known as a source of dye and tannin. When fresh its moisture is far too high for use as fuel. This page is about the hard shell separated from the kernel at cracking plants.
How can I sell my walnut shells?
Sign up to our marketplace for free and create a listing, or message us on WhatsApp. Tell us the volume, the location and any analysis values you have.
How much does a tonne of walnut shells cost?
The price per tonne depends on the season, moisture, cleanliness, volume and delivery point, so we do not publish a fixed price. Tell us the volume, delivery location and schedule and we will send a current quote with the analysis values.
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