Page 38 - Hub-4 Magazine Issue 75
P. 38

  Recycling News
 Figure 2: The inertizable design of the universal shredder of type NGU 0513 is suitable for recycling problematic materials.
Safety thanks to special seals
The choice of sealing materials presented a particular challenge. Conventional sealing materials do not provide sufficient protection and resistance to aggressive acids. The engineers at BHS eventually succeeded in finding a promising alternative to the materials commonly used thus far in the form of special sealing materials. High-quality special plastics, which are both resistant to acid and able to bear the weight of the extremely heavy machines, provide the individual composite parts of the design with an additional layer of safety.
Sensors monitor the stability of the nitrogen atmosphere throughout the shredding process. A camera mounted on the rotary shear also enables operators to respond to potentially hazardous situations before they have a chance to develop. In the event of a leak, both machines can be completely flooded with water within a few seconds as a final protective measure.
The inertizable shredders offer the same performance and functionality as the proven standard machines, even with all of the modifications.
An opportunity for safe battery recycling
The first step of the recycling process in the protective atmosphere sees the input material fed through a sluice into the sealed area. The BHS rotary shear of type VR handles the pre-shredding process. The standard design of this slow-speed, high-torque twin-shaft shredder uses its interlocking blades to reliably process large objects, from industrial, commercial, household and bulky waste to elastic input materials such as refuse-derived fuels (RDF), tires and textiles. The second shredding step sees the universal shredder (NGU), a high- speed single-shaft shredder, reduces the pre-shredded material to the desired final output size.
So far, BHS-Sonthofen has intensively tested the machines specifically for recycling lithium-ion batteries. In principle, they could be used to process a variety of toxic waste and hazardous materials in a protective atmosphere, from shredding-mixing-pumping (SMP) to hazardous chemical waste. To do this, the sealing materials are adapted to the input material should it be required.
 Figure 4: Every single screw and every component was checked for leaks during the design process.
 Figure 3: The rotary shear of type VR 0912 handles the pre- shredding of larger battery modules and packs.
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www.hub-4.com July-August 22 - Issue 75
   





















































































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