Page 48 - Hub-4 Magazine Issue 74

Hillhead
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Once on the post screen the stone gets a final rinse to remove any residue left over from the intensive scrubbing process. The material is then separated into three different products and transferred to the relevant aggregate stockpile conveyor. From here it drops into individual bays ready to be sold. The organics and light weight trash float out the back of the hull onto the 6x2 trash screen. The organic matter, wood and plastics are dewatered into a skip ready for disposal. Any fine sand which is carried out with the wash water is recovered at this point and returned to the sand slurry sump.
The spray bars and manifold on the post screen are fixed to the chassis of the machine and are not in contact with the vibrating screen. This ensures vibrations are kept to a minimum and the lifespan of the spray bars are dramatically increased. Operators can alsodynamically manage the amount of water being used in this post screen with each spray bars control valve.
Impactful Crushing
With the smaller aggregates washed, classified and stockpiled for sale, the larger rocks and stones previously separated from the feed stock are directed towards the Terex MPS Impact Crusher. The H20 Feed Hopper removes any oversized rocks and an over-band magnet removes any metals before they make it to the crusher. A surge bin helps to manage the flow of material to the crusher, where stones are crushed to a more
desired size before being fed back onto the main conveyor. From here another over-band magnet removes any metals that may have been dislodged during the crushing process. Stones and rocks that have been reduced to the appropriate size are then washed and classified, while oversized material will be passed through the crusher again.
Barry McMenamin, Business Line Director for Terex Washing Systems, spoke of the importance of the impact crusher within
this plant, saying “With the amount of stone and rock within the feed material, the impact crusher is essential for this
plant to operate efficiently. The washing elements have been designed to integrate seamlessly with
this specific crusher, which is important for reducing downtime and increasing through
put”.
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www.hub-4.com May-June 22 - Issue 74