Weir Minerals decided to go big with the Aspir WFH1730 jumbo centrifuge, a high-capacity, horizontal fine-coal dewatering centrifuge built on proven principles, such as G force and basket angle. The machine was specifically engineered to process 100 metric tons per hour (mtph) of fine coal. It uses a proven scroll/basket design, combined with high-quality wear components, and maintenance-friendly wet end, specifically designed to handle varying feed densities.

“The design of the inlet/effluent arrangement is such that when the centrifuge is presented with a dilute feed the jumbo simply centrifuges the effluent directly out of the bottom of the machine eliminating any potential of effluent splashing over into the product chamber,” said Paul Jerks, product manager for Weir Minerals Aspir. “The product chamber is further protected by a labyrinth seal between the effluent and product chamber.”

Central to the Aspir range are the coarse and fine coal centrifuges that are engineered to deliver performance and availability in the most arduous coal dewatering applications. Designing the system around G-force and basket angle ensures maximum throughput with highest dewatering efficiency at minimal operating costs.

The Aspir WFH 1730 features a cyclone inlet (patent pending) that aids in the process of separating solids and water prior to the fine product being introduced to the basket. Additionally, this inlet assists in bringing the product up to basket speed thereby reducing coal breakage, which increases fines and moisture content. The horizontal orientation allows for a reduced number of gears and shafts within the centrifuge and offers in situ replacement of the modular drive assembly. “Together with the ceramic lined working faces and hinged effluent chamber providing ample clearance of parts providing unfettered access to wet end components, the Aspir WHF 1730 jumbo centrifuge is not only one of the most technologically advanced fine coal-dewatering centrifuges available today, but is also one of the easiest to maintain,” Jerks said.

The horizontal basket design with its hinged door arrangement and container lock securing mechanism makes for quick and easy access to the wet end for any maintenance inspections. Once open, there is direct access to the basket and high capacity scroll.

Paul Jerks added, “The horizontal basket design, unlike a vertical basket centrifuge, uses centrifugal force and gravity to its advantage in that effluent naturally wants to pass through the basket aperture thereby enhancing the centrifuge’s dewatering effect.”