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MEI Online: Solid-Liquid Separation: Latest News: September 25th 2006


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:: New Fine Coal Centrifuge Introduced to Local Market

Efficient dewatering of coal is one of the highest production priorities encountered by coal preparation engineers. The objectives may be to meet product specifications or environmental constraints or to facilitate the handling of coal and tailings. Reduction of fine coal moisture has become a major concern, particularly as the amount of fine coal increases coupled with pressures to process it.

Seprotech has introduced a new fine coal centrifuge, the CX 1200, designed to significantly improve dewatering performance and increase product yield. Seprotech, who markets the Siebtechnik range of centrifuges, will manufacture the new centrifuge under licence to Siebtechnik at the company's facility in Spartan. Servicing and repair work on centrifuges also forms an important part of the company’s market offering.

All proven principles of the previous generation of centrifuges have been retained and design modifications made to enhance the performance and ease of maintenance of the new centrifuge. Testing was done to verify the technical data on the centrifuge.

Design features of the new centrifuge include:

  • larger housing;
  • improved housing support;
  • increased basket diameter and length;
  • planetary gearbox with high torque capability, overload protection and dual pulley system.

Design engineering modifications to the housing support have eliminated the cantilever effect of the previous machine. The larger housing means the distance between the screen and the housing is increased, resulting in significantly reduced turbulence and therefore less interference.

The higher surface area of the increased basket diameter results in a 40% higher surface area and translates into increased throughput with greater recoveries. The basket is also longer which allows increased residence time, resulting in a significant reduction in moisture content.

The basket is of a segmented design to allow easier handling and storing. The weight of the basket has also been reduced and segments are slotted in and kept in place by a clamp ring. These features facilitate installation, maintenance and servicing. A low friction feed area allows greater throughput efficiencies and reduces wear.

The centrifuge moves at a moderate speed with a moderate G-force of between 140 and 300. The solids feed rate is 80 to 110 tph with a moisture content of between 12 and 17%.

Both the gearbox and drive assembly are accessible from the outside and all special tools are included for safe maintenance. Optional special features include the fact that the basket can be cleaned in situ from inside and outside.




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