What Is a Horizontal Slurry Pump? Types, and Advantages Explained

You must have seen one if you have ever been around mining or heavy industry. It is mounted on a base plate, has a motor on one end, and can take liquid-solid mixtures which would ruin a conventional pump in a few days.

It's a horizontal slurry pump. And for most industrial slurry applications, it's the first choice.

The article outlines what a horizontal slurry pump is, the available types, and why it is the right tool to use.

What Is a Horizontal Slurry Pump?

A horizontal slurry pump is a centrifugal pump that has a shaft that is mounted horizontally. The motor activates the impeller by a direct drive or belt drive, forcing slurry out of the inlet through the impeller and out the discharge.

The shaft is horizontally oriented as is the most popular installation on the ground level.

These pumps deal with slurries: mixtures of water and any solid particles such as sand, gravel, coal, minerals, or chemical solids. They are constructed to be hardier than a regular pump, composed of heavier materials to withstand consistent usage.

Where Are Horizontal Slurry Pumps Used?

Horizontal slurry pumps appear in lots of industries. The most frequent applications are:

• Mining: ore slurry movement, mill discharge, cyclone feed, and tailings.

• Mineral processing: slurry management in flotation circuits and concentrate transfer.

• Coal washing: pumping coal slurry through washing and separation circuits.

• Dredging: the transport of sand and sediment out of rivers or ports.

• Power generation: fly ash management and bottom ash management in coal power plants.

• Construction: pumping of cement slurry, bentonite, and waste from excavations.

• Chemical processing: the transportation of abrasive or corrosive chemical slurries.

In most of these applications, the horizontal slurry pump is most desirable, due to its stability, ease of operation and performance across a diverse spectrum of flow conditions.

Types of Horizontal Slurry Pumps

Not every horizontal slurry pump is identical. They come in a variety of types, with each type having a specific duty condition.

1. Single-Stage Horizontal Slurry Pump

This is the typical configuration: a single impeller, a single casing. It is the most popular in the mining industry and is applied in medium-duty and where only single stage is effective to offer the required head.

Single-stage pumps are available to cover a broad spectrum of flow and pressure needs. They are easy to keep and are very common.

Best for: mill discharge, cyclone feed, tailings, general mining slurry transfer

2. Multi-Stage Horizontal Slurry Pump

Multi-stage pumps have two or more impellers in series to produce increased pressure. The addition of each stage contributes to the overall pressure, so these pumps are ideal in long-distance or high-elevation transfer.

Best for: long pipeline transport, high-head applications, concentrate transport over long distances

3. Heavy-Duty Horizontal Slurry Pump (AH Type)

The AH-type pump is a robust design having a thick casing, liners, which are replaceable, and a robust bearing assembly. It is the horse of the mining industry.

These pumps are designed to work continuously with rough, highly abrasive slurries. The wetted components comprise high-chrome white iron or natural rubber, and can be swapped easily without taking the pump off the base.

Best for: hard-rock mining, mill circuit discharge, high-solids concentration slurries

4. Horizontal Froth Pump

Froth pumps are a special type specifically used to handle froth (a mixture of slurry, air bubbles and chemicals that forms in mineral processing flotation circuits).

Ordinary centrifugal pumps have a problem with froth, as the air bubbles shatter the liquid seal in the pump. In order to cope with this, froth pumps have larger inlet passages, altered designs on the impeller and may have de-aeration chamber.

Best for: flotation circuit feed and discharge, frothy process streams

5. Horizontal Sand and Gravel Pump

The pump is designed to pump heavy and coarse particles (sand, gravel, pebbles) with high flow rates. They have big clearance impellers and broad passageways to avoid clogging.

Best for: sand and gravel operations, dredging, construction dewatering

Key Advantages of Horizontal Slurry Pumps

Why do so many industries default to the horizontal slurry pump? Here are the main reasons:

Stable, Easy-to-Service Installation

Horizontal pumps are mounted on a bottom plate at ground level. Nothing is out of place: the impeller, the seal, the bearings, the liners. The pump can be inspected or serviced without any special tools or procedures.

This accessibility is a massive gain to a pump that requires frequent replacement of worn parts. It takes a shorter time to maintain, there is less chance of mistakes and your staff will be able to perform routine tasks without a professional.

Handles High Flow Rates Efficiently

Centrifugal horizontal slurry pumps are capable of transporting large amounts of slurry with good efficiency. They are more suitable for continuous high-flow, no-pulsation duty as opposed to positive displacement pumps.

In processes that require a continuous and dependable flow of slurry, this continuous flow is prized.

Wide Range of Sizes Available

Horizontal slurry pumps are available in numerous sizes: small pumps with a capacity of a few cubic meters/hr to large pumps with hundreds of cubic meters/hr capacity. This facilitates locating the correct size for your duty.

Manufacturers such as CNSME provide a wide size selection, so you can get the pump as closely matched to your flow needs as possible, and not excessively under- or over-sized.

Flexible Drive Options

Horizontal slurry pumps also provide flexibility in drive configurations, since the motor and pump are separate components linked by a coupling or a belt.

You can use a direct drive for simplicity, a belt drive to allow speed adjustment, or a variable frequency drive (VFD) for full electronic speed control. This lets you optimize the pump for energy efficiency and changing duty conditions.

Proven Track Record in Mining

Over the decades, the mining process has been heavily reliant on horizontal slurry pumps. The design is well established, seasoned, and supported by large volumes of actual performance data.

When you select a horizontal slurry pump of a well-known manufacturer, you are selecting a technology that has a long track record. That minimizes the risks of potential unpleasant surprises and simplifies the process of troubleshooting.

Horizontal vs. Vertical Slurry Pumps: Which Is Right for You?

Horizontal slurry pumps are used in the majority of applications, although vertical pumps are not left behind. Here's how to decide:

• Horizontal pump: Use where the pump may be mounted at the same level as the slurry source, having a flooded suction or a short suction lift. Ideal for the majority of above-ground mining.

• Vertical pump: This is used when the slurry is in a sump or pit and the pump needs to be suspended at the top. Vertical pumps are more effective with changing levels of the sump and do not require priming. Ideal in sumps, trenches and wet pits.

In many operations, both types are used in different parts of the circuit.

What to Look For When Buying a Horizontal Slurry Pump

When you're ready to buy, keep these points in mind:

• Select the pump based on your slurry: be aware of your particle size, concentration and slurry density.

• Test the wet-end material: high-chrome in coarse abrasive slurry; rubber in fine particles.

• Evaluate the impeller type: closed for efficiency; open or semi-open for large particles

• Consider maintenance access: can your team replace the impeller and liners without special equipment?

• Check spare parts availability: lead times on parts can kill your production if you're not careful

• Ask for a performance curve: verify your operating point is in the efficient zone

CNSME Pump manufactures a full range of horizontal slurry pumps for mining and industrial applications, with high-chrome and rubber-lined options and full customization available. 

The alignment of installation and the design of suction piping are the most significant considerations to maximise the service life of a horizontal pump and are often more significant than the material specification of the pump itself.

Final Thoughts

The horizontal slurry pump is the go-to solution for most industrial slurry transfer needs. And for good reason. It's stable, accessible, efficient, and available in a range that covers almost every duty condition.

Whether you're running a mining operation, processing plant, or construction project, understanding the different types and their advantages puts you in a much better position to choose the right pump.

Choose wisely, maintain regularly, and your pump will give you years of reliable service.