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MEI Online: Sizing & Classification: Latest News: April 29th 2003

:: Rotary Classifier to be Commercialised  

Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO) has entered into an agreement with Perth-based RCR Tomlinson Ltd for the commercialisation of the former's rotary-classifier technology. ECE Tomlinson's managing director, John Linden, said: "We were very impressed with the potential of the CSIRO's rotary classifier to replace vibrating screens as the preferred method of classifying mined ore and other materials of interest to the mining industry.. . screens have never been an elegant way to classify material, with high wear rate and constant binding. We see the rotary classifier as a technology to offer the market an effective, fast, low-cost unit operation. . . we hope to have a pilot plant up and running within two years and our research agreement with CSIRO provides for ECE to manufacture and sell the classifier alongside our apron-feeder and scrubber products."

The classifier consists of a longitudinal tube with a fixed endplate, with holes through which particles are separated. The holes are placed at different radial positions depending on the sizes of the particles to be extracted. According to the CSIRO, one or several different-sized fractions can be extracted simultaneously. According to RCR, its research will focus on developing a rotary classifier for continuous processing. Suggested applications for the technology include the classification of building sand (which in tests has been achieved after three revolutions at a speed of 2 rev/mm) and the separation of coal from silicates. It can also be used to mix materials. CSIRO says that in the mineral sands industry the classifier could be used to avoid the undesirable segregation in the heating kilns used in the reduction process of titanium production. Based on CSIRO research, if coal is ground to a particular size dependent on the density difference between coal and titanium dioxide all the particles will mix well and the reduction will proceed more effectively.




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