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Reuse of residual sludge from stone processing: differences and similarities between sludge coming from carbonate and silicate stones-Italian experiences Published version:DOI:10.1007/s12665-016-5865-1 Terms of use:Open Access (Article begins on next page) Anyone can freely access the full text of works made available as "Open Access". Works made available under a Creative Commons license can be used according to the terms and conditions of said license. Use of all other works requires consent of the right holder (author or publisher) if not exempted from copyright protection by the applicable law. Availability: This is the author's manuscript AbstractResidual sludge coming from dimension stone working activities represents a serious environmental and economic problem for both Stone Industry and community. Indeed, most of time, residual sludge is landfilled because of the difficulties to recover it; such difficulties are mainly connected to local legislation and to a lack of proper protocols. In general, two different categories of sludge can be identified: residual sludge coming from carbonate rocks (CS) and those coming from silicate rocks (SS). Both of them are characterised by a very fine size distribution. CS is mainly made up of the same compounds of the processed stones (i.e. marble, limestone, travertine). On the contrary, SS is characterised by high heavy metal content, due to the composition of the tools employed during processing activities and to the original rock characteristics. Furthermore, Total Petroleum Hydrocarbon content can often be recognized in residual sludge. In general, residual sludge, management of which in Italy is administered in accordance with ILD 152/06, can be used as waste for environmental restoration or for cement plants. Several researches investigate possible reuses of residual sludge, after a proper processing phase, as new products. Such "new products" should be certified not only on the basis of their technical and physical characteristics but also by means of appropriate chemical analyses to guarantee that the products are not polluted. The aim of this research is to evidence that, on the basis of a correct sludge characterization, treatment and management, it is possible to produce Secondary Raw Materials (filler, etc…) or New Products (artificial soil, etc…), in order not to waste "sludge resources". Some examples from Italian experimentations are here reported, focusing on the treatment and recovery of SS and CS.Glossary SRM = Secondary Raw Materials NP = New Products CS = sludge from carbonate rocks SS = sludge from silicate rocks GSS = sludge from gangsaw using abrasive steel shot DBC = sludge from multi diamond-saw block cutter MS = mixed sludge TPH = Total Petroleum Hydrocarbon U = Uniformity ILD = Italian Legislative Decree IL = Italian Law a.s. = as such NA = Not available

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