Efficiency of processing methods for the recovery of unmixed material fractions from masonry - Part 1

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. This report discusses the performance limits of the mechanical processing methods used in building materials recycling to separate material composites and prepare for the production of unmixed bulk solids.

1 Introduction

To meet the growing demand for the reuse of recycled mineral aggregate in production, a strategy of differentiation or integration can be adopted [1]:

• Differentiation strategy: the various types of mineral building materials are separated and introduced into a material cycle as unmixed building material fractions.

• Integration strategy: only contaminants are removed from the construction waste and the still mixed building material fractions are used in appropriate applications.

For the introduction of closed material cycles based on the differentiation strategy, higher material...

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