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Very often names are confused for superficiality and speed, but there is a difference between a slurry pump and a sludge pump. Indeed, there are several differences, and it is important to know them to choose the most appropriate one for a certain activity. Below, Perissinotto’s designers will try to shed light on the eternal question of slurry pumps vs sludge, clarifying the differences in the two cases and explaining which type is more suitable for each liquid or material suction activity.
A universally recognized definition of slurry is: “slurry is a liquid mixture, often foul-smelling, coming from domestic or industrial discharges, containing organic and inorganic substances in suspension and dissolved”. Generally, slurry is wastewater from an industrial process before it is eventually purified. Sludge, on the other hand, is a more solid material, resulting from the sedimentation or filtering of slurry or liquids, which can have a clayey component, as well as organic substances and water. In summary, it can be said that sludge is a by-product of slurry treatment. That is, a sludge is extracted from slurry. In theory, the opposite can also happen through a centrifugation process, exactly as it happens inside a washing machine.
Sludge is generally a more solid material that is obtained from the filtering or sedimentation of slurry. It can also be said that slurry is a dirty, unfiltered and unpurified liquid, while sludge is the solid residue that is obtained from the processing of slurry. Therefore, essentially, the two terms differ in the density of the matter to be extracted with a pump. If a liquid is very dense, to the point of being more solid matter than liquid, more than 50%, it is to be considered as a sludge. Otherwise, where the liquid component prevails, we can speak of slurry.
Once the differences between the terms are clarified, it is easier to understand when a sludge pump and a slurry pump should be used. so, slurry pumps vs sludge, who wins? Sludge pumps are designed to handle large amounts of solids, prevent clogging, and handle high-viscosity fluids. Sludge pumps are suitable for wastewater treatment, especially in mining and agriculture. Slurry pumps, on the other hand, are made of materials that are resistant to abrasion and corrosion and often have larger impellers. In this way, they too are useful in the mining sector, in mineral processing (washing), in dredging, in chemical processing, in Oil & Gas and in all sectors that require the extraction, transport and filtering of solid-liquid mixtures in which the liquid component prevails. Now let’s see the main differences between the components of a slurry pump and a sludge pump to understand which pump wins in slurry pumps vs sludge battle. Essentially, a slurry pump must be a centrifugal and submersible pump. In addition, a slurry pump, as mentioned above, has larger impellers and must be made of materials that are resistant to submersion, abrasion, and corrosion. In addition, slurry pumps have a large shaft and bearings and must be able to work at low speed to reduce wear. On the other hand, a sludge pump must have one or more motors (multistage pump), must have a higher power than a slurry pump and, finally, must be able to prevent clogging of the pipelines and the pump itself. But, for the winner of slurry pumps vs sludge pump, make you choice with the models below.
Perissinotto knows very well the difference between slurry and sludge and we know which is the best model you need, aka the winner pump in the slurry pumps vs sludge choice. For example, for sludge uses in Huaron mine (Peru), our client chose a M280 model. These are the characteristics of M280 AO/AB/DC/AS-B20 MINE: Power up to 315 kW, Speed 500-750 rpm, Maximum flow rate 1150 m3/h, Maximum thrust 110 meters, Drain (length) 200 mm.
Instead, for slurry stuffs, Perissinotto drives the client towards the FYM&C model. An all-Hardalloy double stage pump for filter press feeding or long distance transfering. The multi-stage PEMO PUMPS are mostly manufactured in the AO/AB/DC & TC versions, i.e. in a double and triple stage horizontal version with side-suction. These ones are built in order to reach 24 bar (350 psi) with ceramic slip or metal concentrates. The flow rate remains constant while the head increase proportionally to the number of stages. Presently 12 models of PEMO double stage pumps are built with power from 30 to 250 kW (40 – 340 HP) and flows from 30 to 600 m3/h (130 to 2600 GPM) and 5 models of triple stage pumps are available.
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