Production of sharp-sized grades from naturally moist sands
Article by Sigurd Schuetz - RHEWUM GmbH
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.
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 moisture and the clay content cause trouble in the processing. Tests showed that screening cloth of applicated linear motion vibrating screens blinded immediately (see figure below). The optimal solution in this case was a combination of different processes: The feed material is separated at 10.0 mm in the feed section on co-vibrating strainer bars.
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