“Construction and demolition waste are a huge factor in the overall volume of waste generated; they make up over 50 % of the total waste produced in Germany. At present, high quality mineral construction resources are dumped in landfill sites every day or are at most utilised as materials for sub-bases or filling. This is an incredible waste of valuable resources that we are making every effort to prevent. We return large amounts of construction materials to the cycle and use it, for example, in the production of R concrete aggregate. With the Mobirex MR 130i Pro mobile impact crusher from Kleemann, we process concrete demolition material and mixed rubble to produce materials such as mineral aggregates for R concrete. Around 40% cent of recycled aggregates can be added to concrete without any disadvantages with respect to processing, appearance, haptics and strength,” explains Walter Feess. 

“As a recycling company, for example, it is incredibly difficult to get the space we need. Short paths in the materials recycling process would enable us to significantly reduce long transport distances and the associated CO2 emissions. Our company was awarded the contract for the deconstruction of a district administration office in the region. On that project, we were able to return over 90% of the materials to the construction cycle. More specifically, this meant that the aggregate for the R concrete for the new district administration office was produced from the construction materials reclaimed from the old building. In other words, we turned old into new.  The largest proportion of the mineral construction materials was crushed directly on the construction site or at our recycling depots at a rate of up to 1,800t/day,” added Walter.

The company states that it has been helped and was impressed by the Kleeman crusher. “The overall concept of the plant appealed to us right away. The low fuel consumption, the high output and the extremely efficient double deck post screening unit. Space is at a premium here, and with this plant we get two machines in one. We used to use a crushing plant followed by a separate screening plant; now, thanks to the high performance and the ability to discharge two classified final products, the MR 130i Pro is just what we need,” says Walter, who added, “For us, the plant is an extremely important component in the concrete demolition rubble processing chain.”

As parts of its environmental credentials, fuel consumption is important to the company as Walter explains: “Thanks to its low fuel consumption, the plant already fits very nicely into our overall concept. The option for operating the plant with electric power was a decisive factor for us. However, for this purpose we have to expand our transformer station, i.e. the power supply. We are already discussing a number of ideas for the realisation of this. We are also considering expanding the overall area of our photovoltaic power generation systems. It would be great if we could run the plant at least to some extent with electricity from our own renewable energy sources.”

As to operating the crusher, Waldemar Rollheiser added: “All things considered, we are very satisfied with the output and the final product quality. We use both screen decks and produce a range of end products with grain sizes from 0-2mm to 2-16mm. The control system is also very intuitive and easy to use. In the morning I set the plant via ‘Spective’, I can then monitor the current operation from anywhere. I always have an eye on the fuel consumption and also on the crusher filling level. This is very useful and saves many trips. And ‘Spective Connect’ also helps me to optimise my process. For instance, we installed belt scales on all our discharge conveyors. Thanks to this, I can now directly view the output on the respective conveyor. If, for example, the oversize grain increases, it tells me that I need to take a closer look at the process and my settings.”

Walter Feess concluded: “ We are pleased to have Kleemann and Wirtgen Germany at our side as partners who pursue the same objectives as we do: counteracting climate change and doing so in an ecologically and economically meaningful manner.”