Patent ID: 6855262
Filing Date: 2005-02-15
Classification: B01D

Abstract:
1. A method for clarifying and/or thickening a solution containing solids, comprising feeding a slurry via a feedwell into a settling space for clarification, removing the settled solids or underflow via a discharge port in the center of the settling space and removing the clarified solution or overflow as an overflow, and displacing the underflow from the edges of the space towards the center via a rake in the settling space rotating on its shaft with displacement elements on said rake radially to the tank, moving the underflow via displacement element displacement plates at the same distance from the shaft as they rotate from a ring-shaped cross-section towards the center, the displacement capacity of the underflow displacement elements on concentric ring-like cross-sections being basically the same from the edges of the settling space to the central area and the displacement capacity on the innermost concentric ring-like cross-sections of the central area being smaller than on the other cross-sections.