Presented at SME Annual Conference, Denver, USA, February, 2007
Authors
Michael Battersby, Maelgwyn Mineral Services, Cardiff, UK, Rainer Imhof, Maelgwyn Mineral Services, Dorsten, Germany, Michael Fletcher, Maelgwyn Mineral Services, Cardiff, UK, Franz Puder, Gebr. Dorfner GmbH & Co, Hirschau, Germany
Abstract
The traditional processing of kaolin is achieved by dispersion of the mined ore and classification by multistage hydrocyclone plants. Inefficiencies inherent to cyclones produce a middlings product that is commonly disposed of back into the quarry. The Imhoflot G-Cell is an innovative pneumatic flotation process that can be used to recover this previously wasted middlings stream. The technology uses centrifugal forces to assist in the separation of the froth phase from the tailings and consequentially reduce the residence time in the separating vessel. This paper describes the testing, design and installation of a pneumatic flotation plant for kaolin recovery at the Dorfner kaolin plant in Germany.

THE EFFICIENT RECOVERY OF KAOLIN FROM A HYDROCYCLONE PLANT MIDDLINGS STREAM UTILISING IMHOFLOT G-CELL PNEUMATIC FLOTATION