scholarly journals Evaluation of Precious Metal Recovery Processes from Waste Printed Circuit Boards by using Multi Criteria Decision Making Techniques

2018 ◽  
Vol 18 (2) ◽  
pp. 529-537
Author(s):  
Aysun Özkan
Keyword(s):  
Decision Making ◽  
Precious Metal ◽  
Printed Circuit Boards ◽  
Metal Recovery ◽  
Multi Criteria Decision Making ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Recovery Processes ◽  
Waste Printed Circuit Boards

Precious metal recovery from waste printed circuit boards using cyanide and non-cyanide lixiviants – A review

2015 ◽  
Vol 45 ◽  
pp. 258-271 ◽  
Author(s):  
Ata Akcil ◽  
Ceren Erust ◽  
Chandra Sekhar Gahan ◽  
Mehmet Ozgun ◽  
Merve Sahin ◽  
...  
Keyword(s):  
Precious Metal ◽  
Printed Circuit Boards ◽  
Metal Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

scholarly journals Thermodynamic-Based Exergy Analysis of Precious Metal Recovery out of Waste Printed Circuit Board through Black Copper Smelting Process

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1313
Author(s):  
Maryam Ghodrat ◽  
Bijan Samali ◽  
Muhammad Rhamdhani ◽  
Geoffrey Brooks
Keyword(s):  
Precious Metal ◽  
Printed Circuit Boards ◽  
Exergy Analysis ◽  
Waste Treatment ◽  
Exergy Loss ◽  
Copper Smelting ◽  
Circuit Boards ◽  
Recycling Process ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

Exergy analysis is one of the useful decision-support tools in assessing the environmental impact related to waste emissions from fossil fuel. This paper proposes a thermodynamic-based design to estimate the exergy quantity and losses during the recycling of copper and other valuable metals out of electronic waste (e-waste) through a secondary copper recycling process. The losses related to recycling, as well as the quality losses linked to metal and oxide dust, can be used as an index of the resource loss and the effectiveness of the selected recycling route. Process-based results are presented for the emission exergy of the major equipment used, which are namely a reduction furnace, an oxidation furnace, and fire-refining, electrorefining, and precious metal-refining (PMR) processes for two scenarios (secondary copper recycling with 50% and 30% waste printed circuit boards in the feed). The results of the work reveal that increasing the percentage of waste printed circuit boards (PCBs) in the feed will lead to an increase in the exergy emission of CO2. The variation of the exergy loss for all of the process units involved in the e-waste treatment process illustrated that the oxidation stage is the key contributor to exergy loss, followed by reduction and fire refining. The results also suggest that a fundamental variation of the emission refining through a secondary copper recycling process is necessary for e-waste treatment.

Metal recovery from waste printed circuit boards by flotation technology with non-ionic renewable collector

2020 ◽  
Vol 255 ◽  
pp. 120289 ◽  
Author(s):  
Xiang-nan Zhu ◽  
Tao Cui ◽  
Biao Li ◽  
Chun-chen Nie ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Metal Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

A Novel Flowsheet for the Recycling of Valuable Constituents from Waste Printed Circuit Boards

2011 ◽  
pp. 296-306
Author(s):  
Jingfeng He ◽  
Yaqun He ◽  
Nianxin Zhou ◽  
Chenlong Duan ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Separation Efficiency ◽  
Precious Metals ◽  
Metal Recovery ◽  
Recovery Ratio ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Waste Pcbs ◽  
Impact Crushing

Waste printed circuit boards (PCBs) contain a number of valuable constituents. It is of great significance to separate precious metals and non-metallic constituents from waste PCBs with appropriate methods for resource recycling and environment protection. A novel flowsheet for the recycling of waste PCBs using physical beneficiation methods was constructed. Waste PCBs were disassembled into substrates and slots firstly. The substrates were crushed to the size below 1mm through wet impact crushing and separated with a tapered column separation bed. The results indicated that products with integrated separation efficiency of 93.9% and metal recovery ratio of 93.7% were obtained by the primary separation with the water discharge of 5.5 m3/h, feed-rate of 250g/min and inclination angle of 35°. Waste PCBs slots components were crushed to the size of 0.5-5mm through impact crushing and separated with an active pulsing air classifier. The separation results showed that products with integration separation efficiency of 92.4% and metal recovery ratio of 96.2% were obtained with the airflow velocity of 2.90m/s and pulsing frequency of 2.33Hz. Precious metals could be obtained by further separation and purification of the metal components and the non-metal components could be used as refuse derived fuel. The flowsheet has great potential to be applied in the field of waste PCBs treatment and recycling.

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