A Question of (Particle) Character...

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The process sequence starts with mechanical processing based on conventional comminution and classification techniques which have a crucial impact on the subsequent process steps and on the feasibility of urban mining. A lot of research and development work lies ahead. One of the items that need to be addressed is the processing of finely dispersed polymetallic particle systems < 10 µm. Work remains to be done on sorting techniques for ultrafine particle systems with very fine grains (< 50 µm, mainly in the 0.1 µm - 10 µm range) and on energy-efficient comminution.

However even if a cost-effective process can be found, it is by no means certain that there will be a payback over the long term. Fluctuations in income generated from recycled materials tend to be in the double-digit range. A system which is currently generating a good return could quickly become a financial liability. In addition, a constant stream of new materials and composites makes recovery increasingly difficult.

The systems of the future must have sufficient versatility to handle material streams which have varying composition. It is also important to look over the edge of the plate. Recycling always involves a long process chain which extends from consumers to recycling and metallurgy companies. The economic feasibility of the entire process depends on each individual link in the chain.

ACHEMA Presents Solutions

In order to design bulk solids handling systems and equipment which are not susceptible to material flow interruptions and production stoppages, developers need to have in-depth expertise and detailed knowledge of the material properties. Very small particles down to the nano-scale and very large volumes that need to be handled in urban mining call for new approaches for engineers and bulk solid handlers. The ACHEMA exhibition and congress will present solutions for both.

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