Hard-rock operations

Processing natural stone with mobile crushers

Natural stone processing uses a multi-stage crushing and screening process for producing defined grain sizes from large lumps of rock. Such classified final grain fractions are used as aggregates for concrete, asphalt base, binder and surface course layers in road construction, as well as in building construction.

MC 120, MCO 11 S working on a job site in sweden

MOBICAT MC 125 Z processing natural stone

Rock extraction

The rock is quarried by means of drilling and blasting. One possible option for processing the bulk material after it has been reduced to feeding size of the crushing plant is the transport by excavator or wheel loader.

Transport by excavator or wheel loader

When processed in mobile crushing plants, excavators or wheel loaders are used for feeding the rock into the crusher that is usually set up right at the quarry face. The crushed material is then either sent to the next processing stage via belt conveyors, or is transported from the quarry by trucks.

Cubic particles withstand pressure

The higher the compressive strength of rock, the higher is also its quality, which plays an important role in particular in road construction. The compressive strength of a material divides it into hard, medium-hard or soft rock, which also determines the crushing techniques used for processing to obtain the desired grain sizes. The material’s quality is influenced significantly, however, by yet another important parameter: grain shape. The more cubic-shaped the individual grains are, the better the resulting particle interlock. Final grains of pronounced cubic shape are achieved by using several crushing stages. A cubicity showing an edge ratio of better than 1:3 is typical of high-quality final aggregate.

Kleemann GmbH is a member company of the Wirtgen Group, an expanding and international group of companies doing business in the construction equipment industry. This Group includes the five well-known brands, Wirtgen, Vögele, Hamm, Kleemann and Benninghoven with their headquarters in Germany and local production sites in Brazil, India and China. Worldwide customer support is provided by its 55 own sales and service companies.

Kleemann GmbH is a member company of the Wirtgen Group, an expanding and international group of companies doing business in the construction equipment industry. This Group includes the five well-known brands, Wirtgen, Vögele, Hamm, Kleemann and Benninghoven with their headquarters in Germany and local production sites in Brazil, India and China. Worldwide customer support is provided by its 55 own sales and service companies.

© 2018 Kleemann GmbH