Applications
Concrete & building materials
Ready-mixed concrete
Precast concrete
Special & high-performance concrete
Hydro dam concrete
Sand-lime blocks
Kalksandstein
Dry building materials
Sand & gravel
Road construction
Mining & minerals
Disposal
Mixers
Mixers
Twin-shaft continuous mixer (LFK)
Planetary mixer (BPX)
Dry powder batch mixer (DMX)
Twin-shaft batch mixer (DKX)
Single-shaft continuous mixer (MFKG)
Combimix process (DKXC)
Ring layer mixer (AVA HRM)
Horizontal mixer (AVA HTC/HTK)
Laboratory mixer
Plant concepts
Used machines
Crushers
Tests & consulting
After-Sales
Sales
Showroom
Solutions
Processes for metal recovery
Light metal scrap
Automotive shredder residue (ASR)
Waste electrical & electronic equipment (WEEE)
Batteries
Incinerator bottom ash (IBA)
Ferrous & nonferrous slags
Metal recovery from fine fractions
Processes for industrial waste
Machines
Impact crushing
Rotorshredder (RS)
Rotor impact mill (RPMV & RPMX)
Impact crusher (PB) & Impact mill (PM)
Rotor centrifugal crusher (RSMX)
Cutting & tearing shredding
Biomass crushers
Plant control systems
Classifying & sorting
Used machinery
Tests & consulting
After Sales
Sales
Showroom
A Dutch customer wanted to optimize a process for recycling electric motors and motor armatures in order to significantly increase non-ferrous metal concentrations. This request was based on ever-increasing demand for high purity metals. The traditional method uses a hammer mill to crush the meatballs. Given the traditional design of the hammer mill, crushed parts come into contact with each other. The resulting new metal compounds become entangled and subsequently almost impossible to separate into homogeneous fractions. In addition, the hammer mill’s ejectors are designed in such a way that the individual parts inevitably get caught. The greatest challenge lay in treating the materials in a manner such that clean separation could be achieved.
The experts at BHS have many years of experience as well as in-depth knowledge of the process – and this paid off. A thorough analysis of the process was undertaken together with the customer, and different intensive tests were carried out using the customer’s material at the BHS test center. The result is a solution that improves the process in several ways, one that is specifically tailored to this specific application. The meatballs are selectively broken down in the BHS Rotorshredder. The ejection system is also designed in such a way that the shredded parts drop down across the full width of the discharge conveyor belt and do not come in contact with each other again. This ensures that the material cannot become entangled.
After material discharge, the shredded metal is transported under an overhead magnet mounted alongside the discharge conveyor belt to separate the ferrous fraction from the rest of the material. BHS also optimized this process. If the overhead magnet had been installed at a right angle to the conveyor belt, as would typically be the case, longer iron parts would drag over the belt and become entangled with other parts. Thanks to this optimization, the remaining parts move along the conveyor without becoming caught or stuck on the belt. A cross-flow sifter then uses a stream of air to release the copper portion of the material from stainless steel parts and heated, non-magnetic iron parts. The rotor impact mill (RPMX) is well suited for removing impurities from copper fractions extracted from the material. The RPMX for recycling applications stands out because of its higher circumferential speed and a smaller milling gap. The result is a high-quality metal concentrate that is of the same quality as copper recycled from cables.