Vidyadhar, A and Das, Avimanyu (2013) Stratification and segregation features of pulverized electronic waste in flowing film concentration. Journal of Environmental Management, 118 (IF-3.188). pp. 49-54.
|PDF - Published Version |
Restricted to NML users only. Others may use ->
Gravity separation of metals from plastics in pulverized e-waste using flowing film concentration in a shaking table was investigated. Over 51% rejection of plastics in a single stage operation was achieved under optimum conditions. The shaking table was shown to be suitable for processing ground PCBs. Pulverized e-waste containing 22% metals was enriched to around 40% metals in a single pass. Statistical models for the mass yield of metal-rich stream and its grade were developed by design of experiments. Optimization was carried out to maximize the mass yield at a target product grade and preferred operating regimes were established. Experiments were designed to prevent metal loss and over 95% recovery values were obtained under all conditions. Settling distances of metals and plastics were computed and shown to be good indicators of separation performance. Particle morphology and stratification in the troughs in between the riffles were shown to influence the separation significantly. Water flow-assisted motion of the plastics was captured and its role in determining the effectiveness of separation was described. The efficacy of tabling was well established for treating ground PCBs. The wet process was shown to be environment friendly and sustainable. It is also relatively cheap and has good potential for industrial application. However, rigorous cost estimates will be required before commercial application.
|Uncontrolled Keywords:||Printed circuit boards; Tabling; Settling distance; Electronic waste; Metal recovery|
|Deposited By:||Dr. Vidyadhar Ari|
|Deposited On:||12 Feb 2013 11:15|
|Last Modified:||08 Oct 2014 10:17|
Repository Staff Only: item control page