High capacity

Improved grinding efficiency with the Derrick® Stack Sizer® Screen

1 Funktionsprinzip der Stack Sizer-Siebmaschine • Principle of operation of the Stack Sizer screening machine

2 Mahlkreislauf mit Hydrozyklonklassierung im Werk von Brocal • Brocal grinding circuit with hydrocyclone classification

3 Mahlkreislauf mit Siebklassierung im Werk von Brocal • Brocal grinding circuit with screen classification

4 Vergleich der Endprodukte aus den Hydrozyklon- und den Siebkreisläufen im Werk von Brocal • Comparison of circuit products from hydrocyclone and screen circuits at Brocal

5 Mahlkreislauf der Mühle 24 im Werk von OJSC Apatit mit Hydrozyklonklassierung • OJSC Apatit Mill 24 grinding circuit with hydrocyclone classification

6 Mahlkreislauf der Mühle 24 im Werk von OJSC Apatit mit Siebklassierung • OJSC Apatit Mill 24 grinding circuit with screen classification

7 Vergleich der Endprodukte aus den Zyklon- und den Siebkreisläufen im Werk von OJSC Apatit • Comparison of circuit products from cyclone and screen circuits at OJSC Apatit

8 Mahlkreislauf der zweiten Stufe mit Hydrozyklonklassierung im Werk von KMAruda • KMAruda second stage grinding circuit with hydrocyclone classification

9 Mahlkreislauf der zweiten Stufe mit Siebklassierung im Werk von KMAruda • KMAruda second stage grinding circuit with screen classification

10 Mahlkreislauf mit Hydrozyklonklassierung in der Mine Cerro Lindo • Cerro Lindo grinding circuit with hydrocyclone classification

11 Mahlkreislauf mit Siebklassierung in der Mine Cerro Lindo • Cerro Lindo grinding circuit with screen classification

Eine von 38 Stack Sizer-Siebmaschinen in einer Eisenerzmine in Brasilien • One of 38 Stack Sizer screening machines operating at an iron ore mine in Brazil

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...