Unmixed

Efficiency of processing methods for the recovery of unmixed material fractions from masonry - Part 2

Summary: In future, as a consequence of modern masonry construction, an increased volume of complex material composites and wider material diversity in mineral construction and demolition waste can be expected. To enable the reuse of recycled aggregate in production, such material composites must first be separated into unmixed material fractions. Adhesive bonds that normally have to withstand external mechanical influences for as long as possible must be broken down during processing. In this context, besides efficient sorting and the discharge of impurities and contaminants from the recyclable fractions, liberation comminution is one of the main requirements for the recovery of unmixed material fractions. Part 2 of the paper presents the results of the liberation comminution tests as well as alternatives to the current situation for the production of unmixed material fractions.

4 Test results

In the following, a report is presented on the liberation of the masonry materials, without consideration of the liberation of the thermal insulation materials. For reasons of clarity and comprehensibility, the results of just four basic wall types are presented: RC2, RC6, RC9 and RC10.

4.1 Particle size distribution

Figs. 8 to 11 show the particle size distributions of the selected RC mixes RC2, RC6, RC9 and RC10, which vary depending on the crusher type. It should be noted that only one operating setting was tested. After comminution in the impact crusher, a much higher...

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