http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Recycling of printed circuit boards (PCBs) to generate enriched rare metal concentrate
Vinod Kumar,이재천,정진기,Manis Kumar Jha,김병수,Ratnakar Singh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
An eco-friendly process for recycling obsolete PCBs to get enriched rare-metal concentrate usingphysical separation technique is discussed. Metal concentration in digital video disc (DVD) PCBs is43 wt.% whereas in vacuum cleaner (VC) PCBs 30 wt.% with rare metal of 2.8%. Concentrate grade of88% total metals including 5.85% rare metals in-case of DVD-PCBs while 90% of total metalsincluding 2.81% rare metals in-case of VC-PCBs was achieved by froth flotation. While 75% totalmetals including 9.41% rare metals for DVD-PCBs and 65% total metals including 5.10% rare metalsfor VC-PCBs was obtained by pneumatic separation.
Recycling of printed circuit boards (PCBs) to generate enriched rare metal concentrate
Kumar, Vinod,Lee, Jae-chun,Jeong, Jinki,Jha, Manis Kumar,Kim, Byung-su,Singh, Ratnakar Elsevier 2015 Journal of industrial and engineering chemistry Vol.21 No.-
<P><B>Abstract</B></P> <P>An eco-friendly process for recycling obsolete PCBs to get enriched rare-metal concentrate using physical separation technique is discussed. Metal concentration in digital video disc (DVD) PCBs is ∼43wt.% whereas in vacuum cleaner (VC) PCBs ∼30wt.% with rare metal of ∼ 2.8%. Concentrate grade of ∼88% total metals including ∼5.85% rare metals in-case of DVD-PCBs while ∼90% of total metals including ∼2.81% rare metals in-case of VC-PCBs was achieved by froth flotation. While ∼75% total metals including ∼9.41% rare metals for DVD-PCBs and ∼65% total metals including ∼5.10% rare metals for VC-PCBs was obtained by pneumatic separation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High metal recovery achieved from PCBs of EOL-DVD and EOL-VC. </LI> <LI> The evolved process doesn’t require any chemical reagents. </LI> <LI> The process is eco-friendly and economical with no recurring cost. </LI> <LI> Re-circulating and water conservation in close-loop nutsche filtration. </LI> <LI> Enriched metallic concentrate is suitable for hydrometallurgical purification. </LI> </UL> </P>