High capacity

Improved grinding efficiency with the Derrick® Stack Sizer® Screen

Summary: The high capacity Stack Sizer screening machine consists of up to five decks ­positioned one above the other and all operating in parallel. Together with Polyweb™ ­urethane screen surfaces as fine as 45 µm (325 mesh), fine wet screening has become a practical reality in mineral processing operations worldwide. The application of this ­technology to improve the performance of closed circuit grinding is demonstrated with specific application examples.

1 Introduction

Screening is the process of separating particles by size and fine screening typically refers to separations in the range of 10 mm (3/8 inch) to 38 µm (400 mesh). Fine screening, wet or dry, is normally accomplished with high frequency, low amplitude, vibrating screening machines with either elliptical or straight-line motion. Various types of wet and dry fine screening machines and the factors affecting their operation have been discussed previously [1].

In fine particle wet screening, the undersize particles are transported through the screen openings by the fluid and the...

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