Brought into line

Rotor crushers for the production of sand and fine sand

1 Principle of operation of rotor crushers

BHS principles of operation for sand production
a Machine type with two centrifugal chambers

b Machine type with horseshoe-shaped impellers

Schematic showing the configuration of a BHS twin-chamber rotor
a Material flow – horizontal

b Material flow – vertical

Schematic showing the configuration of a BHS rotor impact mill

Screening curves for the BHS rotor centrifugal crusher
a Comparison of the screening curves – operation with the anvil ring and with the material bed

Sand screening curve 0-2 mm, comparison of the screening curves – operation with the anvil ring and with the material bed

Enriching coarse natural sand with added fine sand

Screening curves for a BHS rotor impact mill
Production of coarse sand, added to the finer natural sand

Production of dry mortar sands

Increased contend of fine sand

Comparison: screening curves for the rotor centrifugal crusher and rotor impact mill

BHS RSMX1222 rotor centrifugal crusher

BHS rotor impact mill

Size reduction systems unit at the BHS test centre in Sonthofen

Test report

Summary: For the production of sands for the construction materials industry BHS Sonthofen has developed special rotor crushers, which depending on crushing requirements and the application range of the sand product can process soft, medium-hard to hard and wear-intensive rock. At the company’s test centre original machines are available for conducting test series. The following paper describes the principle of operation of BHS rotor crushers and presents different examples of crusher performance with reference to screening curves.

Sand is a fundamental raw material component in the non-metallic minerals sector, as well as in the construction materials industry. In addition, sand is an important aggregate in concrete and mortar. The term sand is defined in the German industrial standard DIN 4226-1 as a fine rock grade with grain size range from 0-4 mm. In practice, sands are usually classified in the grades 0-1, 0-2, and 0-4 mm. Sand is found as a natural rock product or can be produced artificially in a crushing process. The demand for and the requirements to be met especially by high-quality sands are steadily rising.

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