01
Drum it dry
Sludge settles into 55-gallon drums at roughly 400 to 600 lb each. The drier the drum, the better it pays — moisture is weight nobody buys.
CARBIDE SLUDGE & SWARF BUYER
We Buy Carbide Grinding Sludge
Carbide grinding sludge and swarf, bought by the drum and priced on contained tungsten with an assay on every load. Full drums run 400 to 600 lb, freight is arranged at drum quantities, and You see the assay behind Your quote.
SLUDGE IS REAL MONEY
Your grinding sludge is tungsten waiting to be measured.
Every CNC grinding shop produces it: the gray sludge from the wheel, the filter cake, the swarf that settles in the tank. It looks like waste and prices like a metal — because a large share of it is tungsten carbide, sold on contained tungsten.
Ironcrest buys carbide sludge and swarf by the drum, assays every load, and shows You the numbers behind Your quote. Dried drums of 400 to 600 lb are the standard unit, and freight is arranged at drum quantities.
HOW SLUDGE PRICING WORKS
Assay first, then a real number.
02
Assay on every load
A sample from Your drum is tested for contained tungsten. The assay percentage and moisture drive the price — and You see the result.
03
Custom quote per load
Sludge never prices off the solids board. Your quote is built from Your drum's assay, quoted in writing before the drum leaves Your floor.
04
Freight arranged
Drums ship on freight Ironcrest arranges at drum quantities. Chicago-area drums can be picked up directly.
THE HONEST TIMELINE
Sludge settles in about two weeks. Here is why.
Solids settle in 24 to 48 hours because a scale and an XRF gun finish the job. Sludge needs a lab step: the drum is sampled, dried, and assayed before the contained tungsten is known. Most sludge loads settle inside about two weeks from pickup — photos get You a fast preliminary quote, the assay sets the final number, and payment lands on settlement. I would rather give You a real timeline than a fast promise.
Grinding shops that produce sludge steadily can run recurring drum pickups, so drums never stack up waiting for a buyer. For the full seller-side walkthrough, read the guide to selling carbide sludge and swarf.
WHAT I BUY
Every wet and dry form.
Grinding sludge
Wheel sludge from tool, cutter, and insert grinding — the main event.
Filter cake & media
Carbide-bearing filter cake and spent filtration media from grinding lines.
Dried swarf & chips
Dried carbide swarf and grinding chips, bagged or drummed.
Settling-tank sludge
Tank cleanout material from coolant and settling systems.
FREQUENTLY ASKED QUESTIONS
Questions, answered straight.
How much is carbide sludge worth?
Sludge pays on contained tungsten: a sample of your drum is assayed, and the price follows the tungsten percentage and the moisture in the load. Dried, full drums pay the best. Every load gets a custom quote from its own assay — send photos of the drum and how it was stored and I will start the quote.
Why does sludge not pay the solids price?
A pound of sludge is part carbide, part grinding-wheel grit, steel fines, and coolant or water. The tungsten inside is what carries the value, so sludge is priced on contained tungsten after assay instead of at the clean-solids rate. That is how every honest sludge buyer prices it — the difference is I show You the assay.
How much sludge do I need to sell?
One full drum — roughly 400 to 600 lb — is the practical unit, because freight and assay spread across the load. Shops that fill drums on a schedule can set up recurring pickups. Smaller amounts are worth a conversation if they ride along with solids.
How long until I am paid for sludge?
Honest answer: sludge settles slower than solids. Sampling and assay take days, and most loads settle inside about two weeks from pickup. You get a photo-based quote fast, a real date for the assay, and payment on settlement — a straight timeline instead of a fast promise.
GET YOUR NUMBER
Price your drum.
Text a photo of the drum and tell Me how it was stored and dried. I will start the quote the same day and give You a real assay date.
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