Introduction to Slurry

What is a slurry?  The dictionary definition of slurry is a thin mixture of an insoluble substance, such as cement, clay, or coal, with a liquid, such as water or oil. The word thin when referring to the mixture is important as it is used to separate a slurry from a paste. A paste is a thick mixture of an insoluble solid with a liquid.

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So when is a slurry too thick to be called a slurry and would better be referred to as a paste?  The general rule is if it flows such as the coal slurry shown on the image below does, it is a slurry.

If the product does not flow under its own weight, such as the photo of the soldering paste below, it is referred to as a paste.

A slurry can be described in many ways, but when selecting a pump, it is first important to define why you are pumping a solid. Here, there are generally  three options:

1. You are trying to relocate a liquid that may be contaminated with unwanted solids.
2. You are trying to move a slurry of a fixed percent solids content.
3. You are trying to use a liquid to relocate a solid.

A good example of the unwanted solid slurry would be the dewatering of a mine. Pumps in this type of application are normally made of cast iron, and every effort is made to minimize solids content. When the solids content is very low, generally less than 2% slurry, pump manufacturers refer to this as a dirty water application (not a true slurry application).

Additional resources:
How to Choose Volute Liner for Centrifugal Slurry Pumps
Applications and Considerations of High Head Slurry Pumps
Air to Water Heat Pump: Revolutionizing Heating Systems
Optimizing Home Comfort: A Comprehensive Guide to Monoblock Heat Pumps
How Often Should I Inspect My High Pressure Lined Slurry Pump?

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The second category, where you are trying to move a slurry with a fixed percent solids content, is most often associated with an application that is part of an ongoing process.  Often, these are non-settling solids or ones transported at such a rate as to prevent settling.  A good example of this would be the transportation of pulp stock in the pulp and paper industry.

The third category is the toughest. Here, you are trying to move as much solids as possible, generally with as little liquid as you can. An example of this type of application would be the relocation of mine tailings.  Here, every effort is made to maximize solids content so as not to waste money/energy moving a liquid that is not required other than as a carrier for the tailings. Depending on the specific gravity of the dry solid slurries of 70% solids (by weight) are not uncommon and still flow well.

Hevvy/Toyo Pumps, while making all types of slurry pumps, concentrates mostly on the last category discussed today.  Within this category, there are a host of parameters that are used to help describe a slurry. Things like particle distribution, particle shape, particle hardness, SG of the dry solid, bulk density, percent solids content and PH of the liquid just to name a few. These are all subjects for another day, but I will get to each of them soon.

Cheers RJ

A slurry pump is a type of pump designed for pumping liquid containing solid particles. It tends to be more robust than liquid pumps; they have added sacrificial material and replaceable wear parts to withstand wear due to abrasion and are found in dredging, process pumping applications, highly viscous or abrasive material, sludge, muck, paste, high solids and abrasive applications.

Both centrifugal and positive displacement pumps can be used for slurry, and we&#;ve got them both. Configurations include horizontal, vertical suspended and submersible.



Selection of slurry pumps is more difficult than selection of pumps for water and liquids. Call us to make sure you get the right pump for your application.

You need the right slurry pump for your. That&#;s why the experts at ProFlow work with you to understand the challenges you face and develop the right slurry pump for your specific pumping needs.A slurry pump is a type of pump designed for pumping liquid containing solid particles. It tends to be more robust than liquid pumps; they have added sacrificial material and replaceable wear parts to withstand wear due to abrasion and are found in dredging, process pumping applications, highly viscous or abrasive material, sludge, muck, paste, high solids and abrasive applications.Both centrifugal and positive displacement pumps can be used for slurry, and we&#;ve got them both. Configurations include horizontal, vertical suspended and submersible. Slurry is usually classified according to the concentration of solids. Engineering classification of slurry is more complex and involves concentration, particle size, shape and weight in order to determine abrasion severity. For engineering selection of slurry pumps, slurry is classified as class 1, class 2, class 3 and class 4.Selection of slurry pumps is more difficult than selection of pumps for water and liquids. Call us to make sure you get the right pump for your application.

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