Maximizing Coolant Recovery and Scrap Value

Why Managing Wet Metal Chips Is a Challenge

In high-volume machining operations, metal turnings and bushy chips quickly accumulate in hoppers and bins. These materials are not only bulky and difficult to handle, but also saturated with valuable coolant or cutting oil—up to 20% by weight.

Hauling away wet chips means paying to dispose of reusable coolant, increasing transportation costs, and leaving profits on the floor. The solution: mechanical chip processing that separates and dries the material before recycling.

The PRAB Crusher/Wringer System was engineered specifically for this task—reducing volume, reclaiming coolant, and improving safety and profitability in a single automated process.

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How the Crusher/Wringer System Works

The PRAB Crusher/Wringer combines two powerful stages:

1. Chip Crushing – Reduces turnings and bushy nests into small, flowable chips.
2. Wringer (Centrifuge) Drying – Spins chips at high speed to remove residual coolant or cutting oil.

Step-by-Step Process

1. Material Loading – Wet metal chips enter the Crusher via a feed conveyor or dump hopper.
2. Size Reduction – The crusher’s rotating knives and fixed anvils cut long turnings into consistent pieces that flow easily.
3. Discharge to Wringer – Processed chips are gravity-fed into the Wringer/Centrifuge, where rapid rotation separates fluids from solids.
4. Coolant Recovery – Extracted coolant drains to a collection tank and can be reused or processed in a PRAB Guardian™ Coolant Recycling System.
5. Dry Chip Discharge – Chips exit with only 2–5 % residual moisture, ready for briquetting, storage, or sale to scrap dealers.

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Key Benefits for Manufacturing Facilities

1. Maximum Coolant Recovery

The centrifugal action can reclaim up to 98% of cutting fluid, reducing the need to purchase new coolant and to generate wastewater.

2. Increased Metal Scrap Value

Dry, clean chips command 20–25 % higher resale value than wet scrap. Scrap buyers pay more for consistent, low-moisture loads.

3. Reduced Volume and Disposal Costs

Crushing reduces chip volume by up to 90%, freeing floor space and reducing haul-away frequency.

4. Cleaner, Safer Work Environment

Automated chip handling reduces manual shoveling and fluid exposure. The system is enclosed, eliminating slippery floors and airborne mist.

5. Long-Term ROI

With fluid recovery, labor reduction, and improved scrap pricing, most installations achieve payback within 12–18 months.

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Integration with Other PRAB Systems

PRAB Equipment	Function	Benefit
Metal Turnings Shredder	Pre-sizes bushy chips	Improves crusher throughput
Briquetter	Compresses chips into dense pucks	Reduces volume and increases resale value
Guardian™ Coolant Recycling System	Filters and reuses recovered fluid	Cuts new coolant costs up to 60 %
Drag Conveyors	Transfers chips to the processing line	Automates handling and reduces labor

These components can be configured as a complete chip-management cell, allowing continuous material flow from machining to recycling.

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Case Example: Aerospace Component Manufacturer

An aerospace machining plant generated 5,000 lbs of wet aluminum chips daily. After installing a PRAB Crusher/Wringer system with a cross-flow tramp-oil separator, the results included:

• 98 % coolant recovery
• 87 % reduction in chip volume
• $52,000 annual savings in coolant purchases
• ROI achieved in 13 months

Recovered coolant was routed to a PRAB Ultrafiltration System for reuse, completing the fluid management loop.

For Maintenance and Reliability Leaders

The Crusher/Wringer is designed for longevity with hardened wear components, auto-lubrication, and vibration monitoring. Preventive-maintenance intervals can be scheduled around production cycles, ensuring uptime for critical chip-handling infrastructure.

For Environmental and EHS Professionals

Recycling coolant and minimizing waste discharge support ISO 14001 Environmental Management Systems and EPA 40 CFR 403 compliance. Reducing oily waste also helps meet POTW discharge permits and corporate sustainability metrics.

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Performance You Can Verify

PRAB invites manufacturers to Test Before You Buy—verifying system performance with real material samples.
Through in-house testing, customers can confirm throughput, residual moisture, and fluid recovery rates before purchase—ensuring ROI accuracy and confidence in system design.

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Key Takeaways

• PRAB’s Crusher/Wringer system turns waste into revenue by recovering fluids and producing cleaner scrap.
• Combining crushers, wringers, and downstream filtration maximizes efficiency.
• Facilities routinely achieve 2–5 % residual moisture, 98 % fluid recovery, and ROI in under 18 months.

Learn more at PRAB Metal Scrap Processing Equipment.

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FAQ

Q1: What materials can PRAB Crusher/Wringer systems handle?
They process aluminum, steel, brass, cast iron, and other metal turnings from machining, milling, or grinding operations.

Q2: How dry are chips after wringing?
Residual moisture is typically 2–5 %, depending on chip geometry and coolant type.

Q3: Can the recovered coolant be reused?
Yes. Coolant separated in the wringer can be reused directly or purified in a PRAB Guardian™ Coolant Recycling System.