Method and device for screening out particles

US7959008B2 · kind B2 · utility

Assignee

• SCHOTT SOLAR AG · DE

Inventors

• Hilmar Von Campe · Bad Homburg vor der Höhe, DE
• Werner Buss · Hanau, DE

Key dates

• Filing date: Oct 31, 2008
• Grant date: Jun 14, 2011
• Expiry date: Jun 19, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B07B13/16
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a method and a device for screening first particles out of a granulate comprised of first and second particles by conveying the granulate along a first screen surface which extends outward from a vibrating device, wherein the first particles have an aspect ratio a1, with a1>3:1, and the dimensions of the second particles allow them to fall through the mesh of the first screen surface. To screen a certain material fraction which differs geometrically from the remainder of the material in terms of at least one dimension out of the granulate, it is proposed that the granulate be conveyed along the screen surface between said surface and a cover which extends along the screen surface, and that the cover should cause the first particles to be aligned with their longitudinal axes extending along the screen surface, wherein the longitudinal extension of each first particle is greater than the mesh width of the screen which forms the first screen surface, and the longitudinal extension of the second particles is equal to or less than the mesh width.