Hard Crushing

The area of the hard crushing plant circumferences three crushers, two smooth rolling mills, two Mogensen Sizers as well as a connected dryer.

The production process begins with a jaw crusher of the Esch company. It has a jaw opening of 800 mm and can thus accept bits of about 500 mm size and a Mohs’s Hardness of up to 9 and crush them to 90 to 180 mm.

Afterwards the crushed pieces can be put into a gyratory crusher of the Esch company. This crusher reduces via means of eccentric vibrations the materials to a size of 200 mm to 40 mm.

If the material is damp it can be dried through a connected dryer of the Wibau company to a moisture of 0.2%.

In the grinding plant that was built in the 1980’s is another gyratory crusher built by the Svedala company that effects a crushing from 40 mm down to 4 to 5 mm. The now dry and pre-crushed pieces are being palpated by a magnet separator. Thus a crushing without much iron content is being effected.

Via a bucket conveyor the material is then fed to the first Mogensen Sizer. Here the material is forescreened on five different sieve tiers. Any oversize is transported to a sheet roll and crushed there in counterclockwise circular movements, afterwards again introduced into the Mogensen Sizer and once again sieved. This process is repeated until the material has reached the desired grain distribution. The grain fractions being crushed are then transported into the respective silos.

The standard grain sizes are 0 – 1 mm, 1 – 3 mm, and 3 – 6 mm. Smaller sizes than 0 – 1 mm as well as in-between grain sizes can be produced.

We crush materials for our own refractory mixes, carry out job production crushings up to Mohs’s hardness 9 and pure job order sievings for our customers.

The finished material can either be used in our connected mixing departments or filled in big bags at 50 kg, 25 kg, or 10 kg paper bags or loaded loosely.

The production capacity is about 6 tons per hour, depending on the grain sizes.

Needless to say that the equipment has an enormous wear but is continuously being maintained, repaired or renewed so that all equipment is always on the newest stand.