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Positive displacement pump applications stretch across nearly every stage of a mining operation, from ore slurry transport to tailings disposal and autoclave feeding. And yet, many plant engineers still default to centrifugal pumps out of habit. That’s a costly mistake when you’re dealing with high-solids slurry, long-distance pipelines, or corrosive media that chew through impellers in weeks.
This article breaks down where PD pumps make the most sense, how they compare to centrifugal designs, and what to look for when specifying one for your operation.
Here’s the short version: a centrifugal pump spins fluid with an impeller and converts velocity into pressure. A positive displacement pump traps a fixed volume of fluid, then pushes it out mechanically. That distinction changes everything.
A centrifugal pump’s flow drops when discharge pressure rises. A PD pump? Its flow stays nearly constant regardless of pressure changes. It just keeps pushing. That flat performance curve is why PD pumps dominate in applications with high head pressure, thick slurries, or variable viscosity.
Some numbers worth noting:
The trade-off? PD pumps typically cost more upfront and need a pressure relief valve (since they’ll keep displacing fluid even against a blocked line). But on a total cost-of-ownership basis, PD pumps often pay for themselves within 2–3 years in heavy-duty mining service. This calculation factors in energy, water, wear parts, and downtime.
Related article: Piston Diaphragm Pump vs. Centrifugal Slurry Pump: Which Is Better for Tailings Transport?
Let’s get specific. Here are the areas where PD pump technology earns its keep.
This is probably the biggest growth area for positive displacement pumps in mining. Traditional tailings systems move dilute slurry to large storage facilities, but the industry is shifting toward thickened and paste tailings for environmental and safety reasons.
PD pumps, especially piston diaphragm types, can handle solids concentrations up to 70–85% by weight and push material over distances exceeding 550 km with elevation gains of 2,000+ metres. Centrifugal pumps simply can’t do that without multiple booster stations in series.
TOMINE’s Double Hose Piston Diaphragm Pump applies a two-hose design inside the pump chamber. This design ensures zero leakage of slurry into the hydraulic oil while eliminating the need for high-pressure sealing water.
Underground and open-pit mines produce dirty water loaded with fine particles. Staging multiple centrifugal pumps to reach the required head pressure adds complexity, maintenance burden, and energy costs. A single PD pump can often replace 3–4 staged centrifugal pumps for the same duty, with fewer moving parts exposed to abrasive wear.
Hydrometallurgical processes require feeding hot, acidic, abrasive slurry into pressurized vessels. Piston diaphragm pumps with heat barriers can handle temperatures up to 240°C and pressures well above 100 bar. That’s a space where centrifugal pumps aren’t even in the conversation.
Flotation circuits, CIL plants, and leaching operations all depend on precise chemical dosing. PD pumps deliver constant flow rates independent of back-pressure fluctuations, making them ideal for metering reagents like xanthates, flocculants, and acids. TOMINE’s Pneumatic Diaphragm Pump is designed exactly for this. It suits non-ferrous and ferrous mineral processing applications where dosing accuracy matters.
Thickener underflow slurries routinely hit 55–80% solids. At those concentrations, centrifugal pump wear parts degrade fast. Peristaltic hose pumps and diaphragm pumps handle these thick feeds with far less wear because the abrasive slurry never contacts internal moving components.
Not all positive displacement pumps are the same. Here’s a quick comparison of the main types used in mining:
| PD Pump Type | Best For | Max Solids | Pressure Range | Key Advantage |
| Piston Diaphragm | Long-distance tailings, autoclave feed | Up to 85% | Up to 250 bar | Highest efficiency (85–90%) |
| Peristaltic Hose | Thickener underflow, chemical dosing | Up to 80% | Up to 16 bar | No seals; can run dry |
| Pneumatic Diaphragm (AODD) | Reagent transfer, filter press feed | Up to 60% | Up to 8 bar | Portable; no electricity needed |
| Progressing Cavity | Viscous slurry, low-pressure transfer | Up to 70% | Up to 48 bar | Good for viscous, stringy media |
In our experience, piston diaphragm pumps are the workhorse for high-pressure, high-volume mining duties. But for chemical metering or lower-volume slurry transfer, peristaltic or pneumatic designs are often the smarter choice. It depends on your specific duty conditions, such as particle size, solids concentration, temperature, and required flow rate.
Related article: Common Types of Positive Displacement Pumps: A Complete Guide to Choosing the Right One
This is something a lot of engineers overlook. Because PD pumps can handle higher solids concentrations than centrifugal pumps, they need less dilution water to transport the same tonnage of ore or tailings.
One study found that processing 75 TPH of ore with a centrifugal pump required 130 million additional gallons of water per year compared to a PD pump at higher solids loading. Depending on your location, whether it’s a remote site in Chile or a water-scarce operation in Australia, that water cost adds up fast.
On the energy side, Weir Minerals reported that their GEHO piston diaphragm pumps avoided 12,786 tonnes of CO₂ emissions in 2024 alone, compared to less efficient pumping alternatives. That’s a real, measurable environmental benefit.
And honestly, in an era where European and North American mining operations face tighter ESG reporting requirements, these aren’t just nice-to-have numbers. They go straight into your sustainability disclosures.
We’ve seen a few recurring issues across projects:
Positive displacement pump applications in mining keep expanding. Common uses range from conventional tailings lines to paste backfill, hydrometallurgical circuits, and chemical dosing. The technology isn’t new (piston diaphragm pumps have been in pipeline service since the 1970s), but advancements in diaphragm materials, PLC-controlled positioning systems, and hose pump designs have made PD pumps more reliable and cost-effective than ever.
Quick takeaways:
If you’re planning a new concentrator line or upgrading an existing tailings system, reach out to TOMINE’s engineering team for a proper assessment. We’ve worked on mineral processing plants across multiple mineral types, including copper, gold, tin, lithium, and chrome. With this experience, we can match the right pump to your process.
PD pumps are used to transport abrasive slurries, tailings, and process chemicals in mining operations. They’re especially suited for high-solids-content slurries (up to 85% by weight), long-distance pipeline transport, mine dewatering, autoclave feeding, and reagent dosing. They excel anywhere a constant flow rate under variable pressure is needed.
It depends on the application. For high-pressure, high-viscosity, or high-solids duties, PD pumps are usually the better choice. They offer 20–40% higher energy efficiency under those conditions. Centrifugal pumps still win for high-volume, lower-pressure applications with moderate solids content. Many plants use both types in different parts of the circuit.
With proper maintenance, high-quality PD slurry pumps deliver 12,000–20,000 hours of service life. Piston diaphragm pumps offer up to 98% availability, with only diaphragms and non-return valves as routine wear parts. The payback period versus centrifugal pump systems ranges from 1 to 6.7 years, depending on flow rate and energy costs.
A piston diaphragm pump uses a crankshaft-driven piston to push fluid through a wear-resistant diaphragm. This makes it ideal for high-pressure (up to 250 bar), long-distance transport. Meanwhile, a peristaltic hose pump squeezes a flexible hose with rotating shoes. This design is better for lower-pressure duties (up to 16 bar) where seal-free operation, dry-running capability, and easy maintenance matter most.
Yes. TOMINE manufactures several PD pump types for mining and metallurgical applications, including Double Hose Piston Diaphragm Pumps, Pneumatic Diaphragm Pumps (WKG Series), and TPB Peristaltic Hose Pumps. We also provide full EPC services. Scope ranges from lab-scale ore testing to engineering design, installation, and commissioning.
