THR 4/3D Rubber Slurry Pump
You're moving abrasive tailings, flotation concentrate, or acidic process slurry all day, every day. The THR 4/3D is the rubber lined slurry pump Tobee built for exactly that job — a heavy duty rubber slurry pump with replaceable natural rubber wear parts, so you spend less on liners and less time with the pump down.
If you've priced pumps before, you already know the model number does most of the talking. Read it left to right and you have the whole story: 4 is the discharge size in inches, 3 is the suction size, D is the frame size that sets the impeller and bearing envelope, and THR tells you it's Tobee's Heavy-duty Rubber lined series. Put together, the THR 4/3D is a horizontal, centrifugal, rubber lined slurry pump sized for small-to-mid duty stations that still need real abrasion resistance — sump service, mill circuit transfer, tailings lines, and secondary process duty.
So what is a slurry pump, in plain terms? It's a centrifugal pump purpose-built to move a mixture of liquid and solids — sand, ore fines, tailings, ash — without the impeller and casing wearing through in weeks instead of years. A standard water pump won't survive that duty. That's the whole reason the rubber slurry pump category exists, and it's which pump is used for slurry in most mining and mineral processing plants worldwide.
The mechanics are simple even though the wear environment isn't. Here's the path a batch of slurry takes through the THR 4/3D:
| Slurry enters through the suction, protected by the rubber-lined frame plate liner | → | The rubber slurry pump impeller spins, adding kinetic energy to the mixture | → | Centrifugal force converts that energy into pressure inside the volute | → | Slurry discharges through the 4-inch outlet toward your next process stage |
Every internal wetted surface the slurry actually touches — volute liner, impeller, throatbush, frame plate liner — is rubber, not bare metal. That's the entire point of a rubber lined pump: the rubber flexes and deflects fine abrasive particles instead of letting them cut a groove straight through steel.
Built Around One Job: Surviving Abrasive Slurry
Every design decision on the THR series comes back to wear life. Here's what that looks like once the pump is actually running in your circuit.
The casing, frame plate liner, and throatbush use natural rubber compound, which resists cutting abrasion from fine, sharp-edged particles far better than white iron does at equivalent particle size. It also damps vibration and runs quieter than a metal-lined pump on the same duty.
rubber lined pump / slurry pump rubber liner
The impeller is molded, not bonded from sheet stock, so there's no adhesive line to fail under cyclic loading. Vane geometry is tuned for hydraulic efficiency at low-to-medium head, keeping your kWh-per-tonne pumped down over the life of the wear part.
rubber slurry pump impeller
A reinforced bearing housing and oversized shaft carry the radial and axial loads that come with dense slurry duty. The slurry pump rubber bearing protector and labyrinth seal arrangement keep grit out of the bearing cavity — the single biggest cause of premature bearing failure in the field.
heavy duty rubber slurry pump
Natural rubber holds up across a wide pH window, which is why the THR series is a common choice for acidic mine water, flotation reagent circuits, and mineral slurry that would pit an unlined metal casing within a season.
rubber mining pump
THR 4/3D Performance Envelope
Numbers below reflect the typical operating range for a D-frame, 4-inch-discharge rubber lined slurry pump running natural rubber wet parts — the same class of duty covered by the THR 4/3D. Your exact duty point depends on impeller trim, speed, and slurry density, so confirm your operating point with a Tobee pump engineer before you order.
| Model | Max. Power | Materials | Clear Water Performance | Impeller Vane | |||||
| No. | (kW) | Liner | Impeller | Capacity Q (m³/h) | Head H (m) | Speed n (rpm) | Eff. Η (%) | NPSH (m) | No. |
| THR 4/3D | 60 | Rubber | Rubber | 79.2-180 | 5-34.5 | 800-1800 | 59 | 3-5 | 5 |
Tobee builds the THR 4/3D to your exact duty point, not off a single generic curve — send us your flow, head, and slurry SG and we'll confirm the right trim before quoting.
Every Wear Part Is Replaceable — On Purpose
A rubber slurry pump only pays for itself if the parts that wear out are cheap and fast to swap. That's the design brief behind every wet-end component on the THR frame.
The volute liner bolts in as a two-piece set, so a full liner change is a bay-side job, not a pump removal. Replacing a worn liner instead of the whole casing is the single biggest reason a rubber lined slurry pump costs less to run than it does to buy.
Keyed and clamped to the shaft, the impeller pulls without special tooling. Because it's molded rubber rather than a rubber-coated metal core, there's nothing underneath to expose once the wear surface thins.
Grease-lubricated, double-row bearings sit behind a labyrinth seal and gland packing (mechanical seal available on request) so the bearing cavity stays dry no matter how wet the pit around it gets.
Standard gland packing handles most tailings and mineral slurry duty; where you're running abrasive fines at higher pressure, we set up expeller seals or mechanical seals so the rubber slurry seal matches your actual site conditions instead of a generic default.
Where the THR 4/3D Goes to Work
Slurry pump uses run wider than most people expect once you look past the mine gate. Here's where plants actually run this frame size.
Copper, gold, and iron ore slurry transfer; coal washing plants; underground and open-pit dewatering sumps.
Flotation cell feed and concentrate transfer, cyclone underflow, thickener underflow, grinding circuit sump service.
Tailings pond return, industrial wastewater, sewage & effluent pumps duty where fine abrasive solids are present.
What You're Actually Buying
|
01 Longer Wear Life on Fine Abrasive SlurryRubber wet parts routinely outlast comparable metal liners on fine, sharp-particle duty — fewer shutdowns, fewer emergency parts orders. |
02 Lower Cost of OwnershipReplaceable liners and a modular wear-part set mean you're buying rubber, not steel, every time something wears out. |
|
03 Better Corrosion ResistanceHandles acidic and reagent-heavy slurry that would eat through an unlined metal casing well before the wear surface itself gave out. |
04 Built to Your Duty PointAs a rubber slurry pump manufacturer, Tobee offers OEM builds, pump selection support, and direct spare parts supply — not just a catalog part number. |
| Condition | Recommendation |
|---|---|
| Slurry Type | Abrasive, fine-to-medium particle slurry |
| Solid Concentration | up to ~40% by weight (medium duty) |
| Max Particle Size | ≤ 6 mm |
| Operating Temperature | ≤ 80°C (176°F) |
| pH Range | 4 – 11 |
| Installation | Horizontal, wet or dry pit |
Running larger particles, higher SG, or temperatures above this window? Ask about Tobee's metal-lined AH-series frame instead — rubber isn't the right call for every duty, and we'll tell you when it isn't.
Both have a place. Here's how they actually compare on the duty most plants run.
| Feature | Rubber Lined (THR) | Metal Lined (High-Chrome) |
|---|---|---|
| Best For | Fine, sharp abrasive slurry | Coarse particle, high-impact slurry |
| Corrosion Resistance | Better | Moderate |
| Noise & Vibration | Lower | Higher |
| Liner Replacement Cost | Lower | Higher |
| Max Particle Size | ≤ 6 mm | ≤ 50 mm+ |
| Max Temperature | ~80°C | ~120°C+ |
Most premature failures on a rubber slurry pump come down to two or three setup mistakes, not a bad pump. Before startup, confirm the shaft rotation matches the arrow cast into the casing, align the coupling within spec rather than eyeballing it, and prime the bearing housing with grease before you run — never dry. Once it's running, avoid dry running entirely; a rubber impeller spinning without slurry to cool it will overheat and delaminate faster than almost anything else you could do wrong.
On the maintenance side, check impeller-to-liner clearance on a set interval rather than waiting for output to drop off — by the time flow noticeably falls, you've usually already lost efficiency for weeks. Pull the suction liner periodically to inspect wear at the eye of the impeller, since that's where cutting wear shows up first, and replace gland packing or mechanical seal components before they start pulling in grit rather than after.
What is a slurry pump?
A slurry pump is a centrifugal pump engineered to move a mixture of liquid and abrasive solids — ore fines, tailings, sand, ash — without the wet end wearing out in weeks. The rubber lined slurry pump is one of the two main construction types, alongside metal-lined pumps for coarser, heavier-impact duty.
What is a slurry pump used for?
Transferring abrasive process streams that a standard water pump can't survive: mill circuit sump service, flotation feed and concentrate, cyclone and thickener underflow, tailings transport, dredging, and sewage or effluent duty carrying fine grit.
Which pump is used for slurry with fine, sharp particles?
For fine, sharp-edged abrasive particles at moderate temperature and pH, a rubber lined slurry pump like the THR 4/3D typically outlasts a metal-lined equivalent. For coarse, high-impact particles or high-temperature duty, a metal-lined pump is usually the better fit.
Is the rubber liner on the THR 4/3D replaceable?
Yes. The volute liner, frame plate liner, throatbush, and impeller are all replaceable wear parts, designed to be swapped without replacing the casing or the pump itself.
How does a slurry pump work?
Slurry enters through the suction, the impeller spins and adds kinetic energy to the mixture, centrifugal force converts that energy into pressure inside the volute, and the slurry is discharged toward the next stage of your process.
What's the slurry pump price for a THR 4/3D, and can Tobee supply replacement liners?
Price depends on trim, motor size, drive arrangement, and seal type, so we quote against your actual duty point rather than a flat list price. Tobee supplies both complete new rubber slurry pumps and replacement rubber liners, impellers, and seals for the THR series — tell us your flow, head, and slurry SG and we'll get you a number.
Get a Quote for the THR 4/3D
Whether you're buying a new rubber slurry pump, sourcing a replacement rubber slurry pump for an existing circuit, or comparing a commercial rubber slurry pump against your current metal-lined unit, Tobee's engineers will size the pump to your duty point and get you a price — not a generic catalog quote.
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+86 311 8722 1317
No. 266, Tianshan St, High-tech Zone, Shijiazhuang City 050000, China.
