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MEI Online: Solid-Liquid Separation: Latest News: November 1st 2005


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:: New Generation Centifuge Reduces Moisture Content in Coal

Recognising that reducing the moisture content in coal increases the value of the final product, Seprotech has introduced the Siebtechnik HSC 1300 Centrifuge.

"This new generation centrifuge achieves above-average moisture content reduction, and it has been redesigned with improved safety and ease of maintenance and operation in mind," comments Horst Schulte, managing director, Seprotech, a company within the Multotec Group.

The level of moisture of coal determines the price that will be received. When the moisture content goes above the specified limit, either a penalty is paid or the payment is reduced. All coal is subjected to moisture content restrictions.

"What usually happens is that the mine and the end user agree on the moisture content upfront. Any excess moisture adds to the weight of the final product being transported, with increased costs associated with the heavier load," says Schulte.

Centrifuges are used to reduce the moisture content. The previous generation Siebtechnik HSC 1300 Centrifuge was achieving a moisture content of between 6% and 8% in the discharge hopper. This figure has been significantly decreased with the new model, launched at the beginning of 2005.

The new Siebtechnik HSC 1300 Centrifuge is ideal for dewatering coarse coal and processes material ranging in size from 2 mm to 60 mm. Advances to the design include a hinged door with HDPE feed pipe and sampling facility; a special tool for removing the basket and basket holder; hydraulic removal of the distribution cone and a drive motor and oil tank which are mounted outside the machine for easier access.

The highest throughputs of up to 450 tph of solids are attained with vibratory centrifuges in which the solids retained by the sieve are transported from the small to the large diameter by axial vibrations, which exceed the rotary movement. Vibratory centrifuges are ideal for processing mass products which can be easily dewatered to a relatively good final moisture content.

Another important feature is the new design of the wedgewire basket, now contained in a basket holder. The wedgewire basket was previously held by supports, but these were an integral part of the basketís strength. This meant that when the wedgewire wore, the basket broke and had to be replaced. "We have achieved far greater ease of maintenance with the new model. This is a critical element, as it contributes to the cost factor. If maintenance is complicated or difficult, requiring excessive time, this translates into high labour costs and extended downtime," comments Schulte.

The Siebtechnik Centrifuge is a robust machine, engineered to withstand harsh operating conditions. The centrifuge uses a specific resonance ratio, which results in the optimally low moisture content. This fact differentiates it from other similar equipment.

Siebtechnik coal centrifuges have been in operation for over 50 years. The brand is recognised as a market leader. All centrifuges are manufactured in accordance with ISO 9001:2000 quality systems.




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