SCHENCK Process Australia recently supplied 10 large double deck banana screens and 10 large vibrating feeders for a new iron ore project in WA.
The units were designed and built to provide high capacity, high efficiency screens for up to 2,000 tonnes an hour in a variety of applications including scalping, sizing and lump re-screening to remove fines that have been generated in handling prior to ship loading.
The screens will be installed at a new mine and a new ship loading facility in the Pilbara region of Western Australia.
The screens are 3.66m wide and 7.63m long with a 0.6m long feed impact liner and a discharge liner 0.3m long. The deck is made up of six slopes each at a different angle.
The screen surfaces are modular polyurethane for long wear life and ease of maintenance. They have flexible type apertures and surfaces to minimise blinding with damp fines.
The screens have a vibrating mass of approximately 22 tonnes and are installed on isolation frames to give additional isolation of the dynamic forces during operation. The isolation frames provide in excess of 99.9 per cent isolation of the dynamic forces and provide smooth installation.
The wide vibrating feeders with diverging pans are used to feed the screens so that they are fed evenly across the width of the screen and to minimise the feed velocity of the ore entering the screen.
The 4.5m long feeders have pans that are 2.4m wide diverging to 3.4m wide at the discharge to the screen. The pans will assist in spreading the ore, promoting flow by eliminating nip points and reducing the friction of the ore on the bin outlet skirts.
The feeders are also installed on isolation frames that have a secondary purpose of a maintenance trolley. The frames also feature special wheels that can be lowered so that the feeder can be rolled out of position for safe and easier liner maintenance.
The screens are supplied with a freestanding dust housing, to minimise emissions of dust during operation. The dust housings have flexible rubber fabric type membranes between the live sections of the screen and the static feed and discharge chutes.
The dust housings were custom-designed to suit the client's feed, under and oversize chutes.