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One of world’s largest screens built

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Schenck Process Australia has built a flat deck screen with a mass of nearly 60t that it says is one of the largest screens in the world, and certainly the largest it has made.

Powered by six Schenck DF601V exciters, the large screen measures 4m x 9.6m.

Following the success of an earlier installation of a Schenck screen weighing 30t, Schenck Australia supplied this much larger screen to replace an existing screen in an oil sands operation in northern Canada.

The screen will be installed on the client’s existing isolation frame and will use the existing dual output gearbox and motor to drive the two rows of exciters.

The screen will receive up to 10,000tph of solid feed, which includes large frozen lumps up to one metre in size.

The oil/sand material contains up to 15% bitumen and is very variable in its handling properties, which depends on the bitumen content, geological properties and seasonal conditions.

The properties range from free flowing, frozen-lumpy to a cohesive mat that is difficult to break up. The raw feed is mixed with up to 2000t/hr of hot water for processing.

The deck is a thick, heavy-duty screen surface with a combination of tungsten carbide and chromium carbide coatings.

These are overlain on the heavy steel backing.

The screen operates outdoors in a harsh environment with ambient temperatures in the range of minus 45°C to plus 35°C.

The material being screened is 70°C, corrosive slurry of hot water and very abrasive oil sand.

The company used special materials and construction methods to cope with the cold environment and the unusual process requirements of high temperature corrosive liquid.

Designed for easy maintenance, the screen is made so maintenance staff will face minimum exposure to the severe environments.

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