When you think of the River Saar, then the things that might come into your head are the landscape, wine, France and holidays. In the hinterland of the River Saar, however, professional quarrying is operated. Directly at the border between the Saarland and the Rhineland Palatinate in Germany, the two companies Hartsteinwerke Johann Düro GmbH & Co. KG and Gebr. Arweiler GmbH & Co. KG extract the reddish-brown quartzite from the Hunsrück-Taunus mountain range.
To produce high-quality rock products, intensive and effective scalping of the raw material upstream of the primary crusher is very important. In both companies, there was a need for improvement to increase the screening rate and quality. Besides the effective and clogging-free scalping, the focus was on reducing the load on the primary crusher with a heavy-duty, load-independent screening system. The new primary crusher consists of the main components feed bin, a push feeder, eccentric screen, jaw crusher, flip-flow screen, steel engineering and various troughed belt conveyers. Some components of the old primary crusher like, for example, bin and jaw crusher were taken over for use in the new facility. The plant engineering and complete assembly round off the complete package for the installation of a modern plant.
The feed rate at the bin amounts to around 300 t/h at a max. edge length of 1 100 mm for the raw material. The feed material is fed by means of a Niagara push feeder onto a Niagara® double-deck eccentric screen, type DSS 1400 x 4800/3500. The upper deck reduces the load on the downstream jaw crusher by scalping at around 100 mm. The lower deck of the scalper screens off screenings and stony soil at around 32 mm. The scalped material is then rescreened on an equally newly installed flip-flow screen at around 5 mm, to improve the quality of the chippings. Alternatively, the scalped material 0 – 32 mm can be stockpiled.
The new precrushing unit was built in a classical, very stable and maintenance-friendly design. As a result, products of higher quality thanks to the lower filler content are produced.
Technical Details:
The quarry Piesberg in Germany has an average annual production of 1.5 million tons raw material. About 300 million years old carbon quartzite is processed to crushed stone, gravel and riprap. The Piesberg deposit is of a very high quality. The quartzite is well known for its hardness and strength. Based on this facts the material is also very abrasive and is a special challenge for a primary crushing plant. Blasted material with edge length up to 2 meters reach the primary crushing plant by heavy trucks. This plant essentially consists of a feeding bunker, a hydraulic reciprocating feeder, a Niagara scalper combined with a 160 t heavy jaw crusher (used from the existing plant) and a Niagara heavy-duty feeder underneath the crusher. The feeding capacity at the feeding bunker is up to 800 t/h. The material is crushed to an edge length of approximately 500 up to 800 mm and transported via three belt conveyors over a distance of about 650 m for further refinement in the existing processing plant.
Technical Details:
Through advanced processing technologies, Haver & Boecker Niagara ensures a consistently high quality level of our customer’s products, which are then later used as sub-bases for road bodies, in asphalt mixes for road construction, as aggregates in concrete or in gardening and landscaping. Here we have designed, tuned and built a complete primary crusher solution with steel structure, vibrating screen NIAGARA F-Class DS 1600 x 6000 eccentric screen and conveyor system, which allows to process more than 400 tons of the material Kuselit/Andesit per hour. The first cut is made at 65 mm, and the second at 20 mm. The customer was looking for high quality, imission and environmental protection, and had a tight implementation schedule, we we kept in line with. The successful implementation of the project was achieved through many years of close cooperation with the teams from Haver & Boecker Niagara and the operator. It is the result of bundling the experience of the specialists from both companies.
Technical Details:
F-Class DS 1600 x 6000 eccentric screen, Steel construction, conveyor
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