Slurry pump

Slurry pumps are widely used in transport of abrasive solids in industries such as mining, dredging, and steel. They are often designed to be suitable for heavy-wearing and heavy-duty uses. Depending on the mining process, some slurries are corrosive which presents a challenge because corrosion-resistant materials like stainless steel are softer than high-iron steel.

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.

The most common metal alloy used to build slurry pumps is high chrome, which is white iron with 25% chromium added to make it less brittle. Rubber line casings are used for applications where the solid particles are small.

• Impeller - made of elastomer, stainless steel or high-chrome, is the main rotating component which normally has vanes to impart the centrifugal force to the liquid.^[2]

• Casing - split outer casing halves of cast contain the wear liners and provide high pressure capabilities. The casing shape is generally semi-volute or concentric, typically less efficient than the volute type.

• Shaft and bearing assembly - large diameter shaft with a short overhang to minimize deflection and vibration. Heavy-duty roller bearings are housed in a removable bearing cartridge.

• Shaft sleeve - hardened, heavy-duty corrosion-resistant sleeve with O-ring seals at both ends to protect the shaft. A split fit allows the sleeve to be removed or installed quickly.

• Shaft Seal - expeller drive seal, packing seal, mechanical seal.

• Drive Type - V-belt drive, gear reducer drive, fluid coupling drive, or frequency conversion drive.