A slurry pump is also known as a lined pump or dredge pump and is a centrifugal pump for transporting a fluid handled containing highly abrasive solids (see Abrasion) such as flotations, suspensions of slag, coal or ore in mining and sinter sludges, or in sand and gravel extraction. They are particularly heavily exposed to erosive wear (see Erosion). They are therefore designed in such a way that their wetted surfaces are hard-faced by deposit welding and the components exposed to wear such as rings, bushes, discs, casing inserts, impellers and all types of linings, can easily be replaced by new ones. They must therefore be reasonably inexpensive and consist of materials which are particularly resistant to abrasion or a combination of abrasion and corrosion. See Fig. 1 Slurry pump
The operating requirements also include quick and easy pump dismantling and a reliable spare parts service for the replaceable parts. In addition to these pumps specifically developed for hydraulic solids transport, there is a number of centrifugal pumps that are, depending on their design and material properties, suitable for handling fluids of different contamination degrees and solids content (see Waste water pump and Sewage pump).