New dry recycling process

Soil and building rubble processing with 3-fraction star screen, grizzly screen, impact crusher and air separation

The high quality products are easy to recycle and can also be installed on site with a large proportion

T‌he combination consists of the starscreen 3-mta and a windsifter. It can be extended with an impact crusher. The 3-fraction starscreen has a fine and a coarse starscreen deck and a grizzly screen above the starscreen material hopper. First of all, the very coarse material is separated before it goes to coarse screening and is then finely screened. In the course of the material feed, the grizzly screen separates out oversized material components with rotating rollers; these coarse components (e.g. larger stones or wood components) fall off to the side of the starscreen. The fraction 0 – 150/300 mm passes between the individual rollers into the material hopper and is transferred from there to the coarse starscreen. The coarse screen separates at 63 mm (corresponds to a length of approx. 160 mm). The fraction 63 – 150/300 mm falls off before the starscreen. In this case it is taken over by an impact crusher and crushed.

From the fraction 0 – 63 mm the fine star screen deck then screens at 18 mm. The fine fraction (in this case soil) is discharged to the side in a large, easily removable windrow. The fraction 18 – 63 mm is transferred well cleaned to the windsifter bws 5.0, which transports the material to the side of the starscreen. During the transfer of material from the starscreen to the air classifier, iron is removed by a magnetic roller and collected in a container. The feeding belt from the air classifier conveys the fraction 18 – 63 mm over the blower nozzle. The light fractions are blown by the air classifier in the direction of flow. The wind flow can be adjusted to different strengths. The heavy fraction falls onto a conveyor belt and is discharged laterally by the air classifier.

After the first pass, the soil and fraction 18 – 63 mm can be recycled. Before the second pass, the space is cleared and the fractions > 150/300 mm and 63 – 150/300 mm are crushed and then returned to the star screen. In the second pass the fraction 0 – 18 mm consists of crushed mineral.

The wheel-mounted and track-mounted starscreen travels on site by means of a caterpillar to the pile. Displacement is possible quickly at any time. The air separation can be relocated by means of a wheel loader or excavator. The system can already be used for a working area of 400 – 500 m².

www.backers.de

Issue 03/2023 Versatile starscreen

Screening, soil stabilisation and liquid soil production with one machine

Backers manufactures mobile starscreens, starscreen and mixing machines as well as starscreen decks, stationary plants, air classifiers and various additional components. The machines are used in the...

Issue 01-02/2018

Screening and crushing instead of crushing and screening

The new grizzlyscreen supplied by Backers enables a new, alternative processing of C&D material, mineral soils and rocks with clay stuck to them. The rotating rollers, which are very firmly fixed at...

Issue 04/2024

Backers Maschinenbau GmbH

The Backers company is known as a manufacturer of star screens. Since 1989, this technology has been continuously developed for use in mineral and organic materials. Today, even cohesive soil can be...

Issue 01-02/2010

Fine and very fine screening

Throw screening from the beginning of the 20th century to the present demonstrated by the example of directly excited throw screening machines

1. Throw screening machines directly excited by means of bumpers or impactor bars The development of bumper-type screens [1], which had begun in America at the beginning of the 20th century, was...

Issue 05/2017

Track-mounted impact crusher with screen unit

Harsch-EBRD, a group of companies based in Bretten between Stuttgart and Karlsruhe in Southern Germany, is combating the increasing volume of materials from reconstruction and the higher requirements...

AT 07-08/2020