The Knelson centrifugal concentrator, which consists of two vertical concentric cylinders, was first used in Canadian industry in 1980.

The outer cylinder is a stainless steel cylinder, which is mainly used to form a sealed water jacket with the inner cylinder and drive the inner cylinder to rotate. The inner drum is a plastic cone separator with a semicircle of 15 degrees. The inner side of the drum is composed of several rounds of tapered strips. Between every two rounds, there is a circle of tangential water inlet holes arranged at certain intervals.

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