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Major operations carried out by MPEX tracked mobile crushing and screening equipment

Time:2018-09-30

Whether processing natural stone or recycling, with the flexible MPEX tracked mobile crushers and screeners, customers have the best equipment for every job. 

Old becomes new

Processing recycling materials with mobile crushers

As the earth’s natural resources are becoming ever scarcer, recycling is becoming ever more important. In the building industry, recycling products help to reduce the requirements for primary raw materials. All in all, an increasing demand for recycling material, in particular by the construction industry, has been recorded in the international market in recent years.

 

Separating into individual components

In addition to reinforced concrete, asphalt or bricks, demolition waste and mixed construction waste are also separated into their reusable components by means of mobile crushers or stationary crushing and sorting plants, enabling the cleanly sorted recycling materials to be reused in the construction industry. Incineration ash and steel slag are also recycled to high-quality aggregate that is used, for instance, in road surface courses – a method which is enjoying ever-increasing popularity in Europe.

Producing high-quality recycling material

A highly efficient method of processing recycling material combines crushing, screening and separation of metals. To produce an end product of even higher quality, the additional steps of washing, removing light materials, such as plastics or paper, by air classification, and yet another electro-magnetic metal separator are incorporated into the recycling process.

Use of impact crushers

Impact crushers are increasingly used today for crushing recycling material. Impact crushers are capable of producing mineral aggregate mixes in one single crushing stage in a closed-cycle operation, making the use of this type of crushers particularly cost-effective. Different crusher units can alternatively be combined for the processing of recycling material.

 

Separating metals

Effective separation of metals is of particular importance in the recycling process. Highly powerful magnets are used for this purpose, aiming at separating 100% of the ferrous metals contained in the feed material. Metal parts that have been isolated in the crushing operation are separated from the recycling material by the magnetic separator and discharged.

 

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.

 

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.

 

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