Use of rotor impact mill in fertilizer production

April 2017

Reference at a glance


New fertilizer production process at Lovochemie A.S.


Rotor impact mill of type RPM

Operating site

Czech republic




Breaking up ammonium sulphate (fertilizer)


Grinding technology from the construction industry

Grinding technology from the construction industry was used for the first time in the production of fertilizer at the Czech company Lovochemie A.S. A rotor impact mill (RPM) from BHS-Sonthofen breaks ammonium sulphate, replacing many process steps in doing so. The system’s strength lies in its highly consistent grading curve and low cost of operation.

Lovochemie A.S. is the Czech Republic’s largest fertilizer producer. While carrying out the construction of its new production facility for artificial fertilizer, the company installed a BHS rotor impact mill that not only achieves the desired grading curve while ensuring consistent, sustainable quality, but also simplifies the production process in general. The machine also eliminated the need for additional screens to sift out oversized particles. The company knew all about its reliability and cost-efficient operation from crushed sand production. This was the first use of the rotor impact mill in breaking up ammonium sulphate.

One unique challenge of this crushing process is the fact that the salt is delivered in open trucks or train cars. The salt may absorb moisture from the air during transportation and storage, increasing the likelihood of agglomeration. BHS carried out a number of breaking and grinding tests with a rotor impact mill of type RPM at its test center in Sonthofen, Germany, before it went into operation in 2017. The machine now crushes up to 35 metric tons of ammonium sulfate each hour. Materials with feed sizes of up to 2 millimeters are crushed to a maximum grain size of 0.2 millimeters. The machine runs continuously 24 hours a day, five days a week, and fulfills all of the customer’s needs in terms of performance and product quality.