Clean separation in recycling operation with Apex-Foedertechnik

H P. Kaiser, a medium-size earthwork and recycling contractor based near Düsseldorf, and its 35 employees have been processing high tonnages of construction waste, soils and demolition materials since 1988. Directly on site, a recycling plant is installed for building rubble and soils as well as a container service. The recycled material is then used via a number of established regional customers in a wide range of construction projects.

In 2016 came the decision to replace the existing screen with a new higher-capacity unit. Besides numerous demonstrations by different screen suppliers, the decision was taken in favour of a R105 scalping screen from McCloskey. “The price-performance ratio and the extremely economic fuel consumption of the mobile unit that Apex Fördertechnik, based in the Lower Rhine region, made available to us made the decision easier,” says Patricia Kaiser, managing director of H. P. Kaiser.

The screen box of the McCloskey screen already vibrates at a considerable amplitude of 10 mm, while each finger of the screening surface effects additional oscillation of the material. Thanks to this additional vibration by the screen fingers, each with a diameter of 10 mm, the processing of wet soils is much more effective than with fixed surfaces such as perforated plate or square mesh. The latter only effect movement in one direction while finger screen decks are not set in this respect.

With the previous screen, only 70 – 80 t/h recycled material were produced, which led to relatively high energy costs per tonne. With the new screen, the production rate has now been almost tripled. The ­McCloskey screen currently handles feed rates up to 200 t/h. On the lower deck of the new screen, a slotted screen surface measuring 15 x 200 mm is being used for the time being. A material from 0/10 – 0/12 mm is recovered, while clean material of 10/45 as well as the oversize of 45 – x mm is sent to the crusher. Apex Fördertechnik is undertaking the full service as well as supplying wear and replacement parts and ­future screening surfaces.

The R105 can also be supplied as a screen with a wide range of configuration options – including a dual-power, that is diesel-electric drive. Specially for H.P. Kaiser, the screen is equipped with a larger hopper so that it can be fed by means of a wheel loader from the rear. This is an interesting option from the producer’s side as two machines are not needed (that is: excavator and wheel loader) for feeding. The hopper is hydraulically folded to enable fast set-up and dismantling. The transport weight of around 24 t is certainly acceptable. Another advantage of the machine: the screen pitch can be hydraulically adjusted to meet different material requirements. When the screening surface has to be replaced, the screen box can be hydraulically lifted, to allow any necessary installation work on the lower deck to be performed comfortably.

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