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The treatment of natural rock, as well as construction aggregates and ornamental rock creates a great amount of residues, which are usually grain sized under 100 $\mu$m and with chemical and mineralogical composition modified due to processing. Therefore these materials have a composition with a variable content of rock, accompanied with other components as iron particles, clayey materials, flocculants, etc. These contaminants limit the application of those wastes. It is necessary therefore, the search of a proces...