Jigs, Hydrocyclones and Sensor-Based Sorting to Value Recycled Aggregate

Gravity Concentration in Urban Mining Applications—A Review

“…By setting the density cut to approximately 2.4 g/cm 3 and achieving a mass partition of 20 wt % for lights and 80 wt % for heavies, it became feasible to eliminate between 60% to 70% of the cement paste initially adhered to the feed. Similarly, Paranhos et al [128] suggested Despite the positive results in separating distinct aggregates and not requiring process water, dry jigging has some disadvantages. Firstly, as reported by Waskow et al [122], it generates dust and particulate matter in the inhalable size range (−10 µm), with particular concern regarding the generation of particles below 2.5 µm due to their capacity to penetrate the lungs, posing chronic health risks to workers.…”

“…By setting the density cut to approximately 2.4 g/cm 3 and achieving a mass partition of 20 wt % for lights and 80 wt % for heavies, it became feasible to eliminate between 60% to 70% of the cement paste initially adhered to the feed. Similarly, Paranhos et al [128] suggested the utilization of water-only cyclones (water-only cyclones (WOCs) are hydrocyclones with modified designs aimed at enhancing the impact of density (and reducing that of particle size) on the separation process [28]) for the beneficiation of the lower-quality fine fraction of RCA (the crushed reject of coarse CDW previously separated by density) by setting the density cut at 2.1 g/cm 3 . The heavy fraction (+2.1 g/cm 3 ) would be designated as "recycled concrete sand", while the light fraction (−2.1 g/cm 3 ) could be employed to enhance terracing.…”

An economic analysis of the processing technologies in CDW recycling platforms

“…This type of improved process does not currently exist and is being proposed in this study. It is considered to be a new sorting method for recycled aggregates (Paranhos et al, 2015). This process uses the output of the precedent process such as its input flow.…”

“…For the "Advanced Sorting -AdS" process, the difference is the inclusion of equipment called "Near Infrared Sorting". As mentioned for the "Ad" process, "AdS" should be considered as a new method for sorting recycled aggregates (Paranhos et al, 2015). The base of this equipment is the detection of the physical characteristics of materials by emitting infrared beams.…”