In-Depth Characterization of Residual Fines by Digital Image Processing

Thus, any contained valuable materials are largely lost for the economic cycle or removed for the long-term by incinerationor landfilling. The more complex mixtures of solid waste from anthropogenic utilization grow, the greater the proportion of residue fractions after processing. In particular, fine-grained material send up in such residual fractions.Through individual examination of objects it is possible to record detailed geometric data thatcannot be detected in mechanical methods or processes. Such data can be used to determine grain sizes according to varying definitions and to deduct information concerning grain shape. Inliterature, a variety of shape indices is proposed. In this study, filling level, surface ripple factor,aspect ratio, sphericity and symmetric elongation were used. So-called descriptors serve for the calculation of these indices. Descriptors are simple geometric properties of an object. These are usually measures of length, as well as areas or volume.