Mechanical Foam Breaker for Coal Washing Circuits
Washing water, flotation and settling circuits in coal preparation generate foam that carries fine coal away and slows water recovery. Chemical defoamers add cost and can interfere with the same process chemistry you depend on.
What foam actually costs you
- ▲Foam carries fine coal out of settling and dewatering — lost recoverable product
- ▲Foam reduces flotation and settling efficiency, slowing the whole circuit
- ▲Recycled water stays foam-laden and carries the problem back into washing
- ▲Chemical defoamer dosing adds consumable cost and maintenance
How the DP Series fixes it
The DP Series mounts over open washing tanks, flotation cells and settling basins, destroying foam mechanically at the surface. Durable construction for abrasive slurries, no dosing equipment.
Open-tank and basin mounting; abrasive-resistant wetted parts.
Discuss your washing circuit and foam rateDP foam breaker model range for Coal
All DP models use the same mechanical defoaming principle — choose by your foam overflow rate. Size up one step if your rate is near the upper limit.
| DP foam breaker model | Power (kW) | Speed (rpm) | Defoaming capacity (m³/h) |
|---|---|---|---|
| DP-1 | 0.75 | 2,800 | 5 |
| DP-2 | 1.1 | 2,850 | 10 |
| DP-3 | 1.5 | 2,850 | 15 |
| DP-4 | 2.2 | 2,850 | 20 |
| DP-5 | 3 | 2,850 | 30 |
| DP-6 | 4 | 2,850 | 40 |
| DP-7 | 5.5 | 2,850 | 60 |
| DP-8 | 7.5 | 2,850 | 80 |
| DP-9 | 11 | 2,900 | 100 |
| DP-10 | 15 | 2,900 | 150 |
| DP-11 | 22 | 2,900 | 200 |
| DP-12 | 30 | 2,900 | 300 |
| DP-12S | 37 | 2,900 | 500 |
Mechanical foam breaker sizing calculator
Enter your tank dimensions and foam overflow rate. This calculator recommends the smallest DP mechanical defoaming machine that handles your process.
This application runs on the DP Series mechanical foam breaker — see the full model range, technical specifications, sizing calculator and wetted materials.
Why a mechanical foam breaker beats chemical defoamers here
Mechanical foam breaker (DP Series)
- • No chemical dosing — zero interference with your process chemistry
- • One-time purchase, 12-month warranty, 10-year service life
- • No ongoing anti-foam agent cost — payback in 6-12 months
- • No residue in product or effluent — food & pharma safe
- • Centrifugal principle: instant foam breaking at the surface
Chemical defoamer dosing
- • Recurring chemical cost every month
- • Can alter product flavour, colour or reaction chemistry
- • Residue in effluent increases wastewater load
- • Dosing pump maintenance and inventory
- • Overdosing kills the foam you actually need
Frequently asked questions
What causes foam in coal washing water?
Fine coal, clay and residual flotation reagents stabilise foam in washing water and recirculation circuits. The foam carries fines and slows water recovery.
How does foam reduce coal recovery?
Foam carries fine coal out of settling and dewatering stages, so recoverable product is lost with the overflow instead of reaching the product stream.
Can the DP Series work on open settling basins?
Yes. The DP-K model mounts over open washing tanks, flotation cells and settling basins, breaking foam at the surface without touching the process.
What maintenance does it need in abrasive slurry service?
Periodic inspection of the breaking chamber and bushing. The hard-alloy bushing and stainless construction are selected for abrasive mineral service.
Foam control in related processes
Get a quote for your foam problem
Tell us your application, tank volume and foam rate — we will recommend the right DP Series model and quote within one working day.