By Hugo Marcelo Veit, Andréa Moura Bernardes
This ebook offers an summary of the characterization of digital waste. additionally, processing ideas for the restoration of metals, polymers and ceramics are defined. This publication serves as a resource of knowledge and as an instructional technical reference for practising scientists and engineers, in addition to for students.
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Extra resources for Electronic Waste: Recycling Techniques
The riffles, decrease in height along their length so that, progressively, fine and heavy particles are brought into contact with the washing water film that passes over the riffles. The result of the asymmetrical movement towards the riffles and the differential speed of a perpendicular laminar flow is the scattering of material . Other flowing film concentrators are the spiral ones. Spirals and static sluicetype gravity concentrators have been used since 1943 to restore and clean anthracite fine grain .
The processed ore is piled on waterproof pads. Leaching solutions are applied on the surface of the heap ore by sprinkler or drip irrigation, leaching the metals contained in the ore. Sulfuric acid and cyanide are typically used as leaching agents. This leaching process, which involves the percolation of leaching solutions through ore heaps, collects a solution enriched with metals by gravity in lined basins, sumps, and ponds for further processing and recovery of metals. The lixiviant solution is recovered and recycled in the process in a closed system .
It is one of the oldest forms of mineral processing, but its mechanisms are not yet fully understood. The main mechanisms in the process are: differential acceleration, 4 Mechanical Processing 23 sedimentation rates, differential speed in laminar flow, interstitial consolidation and the effect of shear forces . Density separation is a physical process that is based on the difference between the rates of sedimentation or terminal velocity of particles, and its principle is the separation of the materials by different densities, sizes and shapes [14, 15].