Kieswerke Ohle & Lau GmbH, located in the south-east of Schleswig-Holstein, Germany, is one of allmineral’s longest-serving customers. For more than 25 years, an air-pulsed alljig® gravel jig has been deployed here to ensure reliable and efficient processing of this raw material for the creation of maximum-purity gravel. Capable of extremely precise adjustment, this jig is guaranteed to separate out any organic components and those that react with alkalis. Components that react with alkalis are known to cause a wide variety of problems including serious damage to concrete structures such as bridges and motorway surfaces. This has now been complemented by a cutting-edge alljig®G-1400, which was delivered and installed by allmineral in the second half of 2017 as part of the reorientation and expansion of the gravel works in Büchen-Dorf.

High-quality gravel processing in Schleswig-Holstein

Gravel and sand are valuable raw materials in a variety of fields, with a sufficient supply being particularly vital to the construction industry. But as gravel from Schleswig-Holstein features a relatively high proportion of components that react with alkalis, this limits its suitability for use in the production of concrete.

alljig® jigs deliver maximum efficiency

Kieswerke Ohle & Lau GmbH uses alljig® jigs to successfully separate the gravel from organic components and those that react with alkalis. The alljig® first passes a pulsing flow of water through the material awaiting processing in order to loosen it. This ensures the homogeneous layering of the grains according to their density, with the precision configuration of the air-pulsed jig handling the minor variations in density between the gravel and the components that need to be separated.

The alljig® then uses the automatic discharge control to separate the cleaned heavy feed from the layered material bed. The frequency, amplitude and control times of the water pulsation can be flexibly adjusted during operation, thereby enabling high-precision sorting of the feed material. Cleaned gravel is discharged after layering via a fully automated procedure, after which it is classified, dewatered and dispatched to the raw material store along a conveyor belt system.

Long-term collaboration brings great success

Thanks to the efficient separation, concentration and cleaning of raw gravel produced via dry mining using wheel loaders, the two gravel works operated by Kieswerke Ohle & Lau GmbH are able to offer a wide range of high-quality products that hold particular appeal for the construction industry.

The use of a new high-performance alljig® gravel jig ensures that these traditional gravel works will maintain their high quality standards and remain a reliable partner to the construction industry for many years to come.


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Reference projects

Ore mining with alljig®

In the south-east of Australia, alljig® jigs boasting low energy and investment costs are hard at work processing iron ore. This innovative system, which was adapted to suit the new conditions at the Iron Baron Mine, represents a major triumph for allmineral and SIMEC Mining alike. 

Bituminous coal processing with alljig®

Since 2018, two powerful alljig® jigs at the Uvalnaya mine in Siberia have handled the processing of high-quality bituminous coal to generate products for the global market. High-quality coke in particular is enjoying increased demand within the context of pig iron production at integrated smelting works. 

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