Abstract
Automobile-shredder-residue (ASR) recycling techniques have been widely applied for improving the total recycling rate of end-of-life vehicles. In this study, to obtain useful information for predicting or improving ASR-separation efficiency, trajectory analyses of conductors (copper) and non-conductors (glass) were performed using a lab-scale induction electrostatic separator. The copper-wire trajectories obtained showed a good agreement depending significantly on the electric field strength and particle size. The observed copper-wire trajectories showed consistent congruity with the coarse-particles simulation (0.5 and 0.25 mm). The observed fine-particles (0.06 mm) trajectory was deflected toward the (−) attractive electrode, owing to the charge density effects due to the particle characteristics and relative humidity. This results in superior separation performance because more copper enters the conductor products bin. The actual dielectric-glass trajectory was deflected toward the (−) attractive electrode, thus showing characteristics similar to conductive-particle characteristics. Through analyses conducted using a stereoscopic microscope, scanning electron microscope, and energy dispersive spectroscope, we found heterogeneous materials (fine ferrous particles and conductive organics) on the glass surface. This demonstrates the separation-efficiency decrease for non-ferrous metals during electrostatic separation in the recycling of ASR. Future work should include a pretreatment process for eliminating impurities from the glass and advanced trajectory-simulation processes.
Highlights
The recycling of automobile shredder residue (ASR) that is generated in the final process of end-of-life vehicles (ELVs) is an important issue in the recycling field
The variation of electric field strength increased with an increase of applied voltage and it of electric field strength increased with an increase of applied voltage and it decreased as expected, the variation of electric field strength increased with an increase of applied voltage anddistance it decreased as distance increased
From our analysis of the trajectory simulations of conductors and non-conductors, we have concluded that the simulated simulations of conductors and non-conductors, we have concluded that the trajectories of conductors corresponded favorably with their actual trajectory, as shown in our simulated trajectories of conductors corresponded favorably with their actual trajectory, as experimental results
Summary
The recycling of automobile shredder residue (ASR) that is generated in the final process of end-of-life vehicles (ELVs) is an important issue in the recycling field. The amount of ASR is constantly increasing, owing to advances in the automobile industry, but it is mostly disposed of in landfills [1]. Development of a technique for separating ASR that can achieve a recycling ratio of over 95% for ELVs as well as solve the corresponding disposal problems is required [2,3,4]. ASR can be separated using a series of mineral-processing operations, such as comminution, air classification, magnetic separation, and/or electrostatic separation. Non-ferrous metals in the ASR may be recovered by electrostatic separation but, to date, the use of this method has not been common
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