Clear passage - Production of sharp-sized grades from naturally moist sands

The requirements of the premixed plaster industry for the production of up to five sharp-sized fractions mean dealing with various processes in order to meet the needs of this difficult to screen material. An Italian manufacturer of different grain sizes for well-known producers of premixed plasters approached RHEWUM with the objective of sizing 80 t/h crushed dolomite flour into the fractions 10.0 mm, 3.5 mm, 2.25 mm, 1.6 mm and 1.0 mm.

The mineral grades contained in premixed plaster are usually extracted at quarries and then crushed in a jaw crusher. After that the produced bulk materials are classified and made available for further production. The moisture of the feed material may vary widely due to rainfall and temperature changes and can be as high as 10 wt% – which makes screening difficult. Also, the concentration of the moisture in the fine fractions and the not inconsiderable clay content cause trouble in the processing.

On linear motion vibrating screens the indicated task led to immediate blinding of the...

Order the printed issue

Related articles:

04/2018

Optimum use of screens

W?ith the use of a classifying screen, the efficiency of the ?crushing and screening process in natural stone and recycling applications can be improved. To obtain a high-quality end-product, it is...

more
04/2011

Vibrating screens with rubber balls for ­cleaning the screening surface

Dosiertechnik GmbH manufactures vibrating screens with rubber balls for cleaning the screening surface. This simple yet very effective method of cleaning screening surfaces is used in screens with...

more
01-02/2013

Ideal completion

BMD, the Heidelberg-based service company for construction machinery and equipment and manufacturer of the container-mobile crushing plant RA 700/6, has included the double rotary screening plant...

more
07-08/2009 Focus Industry

Screening system for flexible adaption

In addition to the trend for ever higher capacities, there is a growing demand in the non-metallic minerals for screening products to well below 100 µm, so as to eliminate the need for...

more
05/2010

All about the drum

Soil, sand, compost, gravel, wood chips and various residual products are examples of what can be screened by the MULTI SCREEN® MS 2001 from the company ZEMMLER Siebanlagen (Fig.). Almost any...

more