Metal Recovery from Printed Circuit Boards Using CRT Glass by Reduction Melting

2019 ◽  
pp. 185-197 ◽  
Author(s):  
Hiroyuki Inano ◽  
Keiichi Tomita ◽  
Tatsumi Tada ◽  
Naoki Hiroyoshi
Keyword(s):  
Printed Circuit Boards ◽  
Metal Recovery ◽  
Circuit Boards ◽  
Printed Circuit

scholarly journals Separation and Recovery of Fine Particles from Waste Circuit Boards Using an Inflatable Tapered Diameter Separation Bed

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Chenlong Duan ◽  
Cheng Sheng ◽  
Lingling Wu ◽  
Yuemin Zhao ◽  
Jinfeng He ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Printed Circuit Boards ◽  
Fine Particles ◽  
Metal Recovery ◽  
Circuit Board ◽  
Circuit Boards ◽  
Recovery Rates ◽  
Operational Conditions ◽  
Printed Circuit ◽  
Wide Range

Recovering particle materials from discarded printed circuit boards can enhance resource recycling and reduce environmental pollution. Efficiently physically separating and recovering fine metal particles (−0.5 mm) from the circuit boards are a key recycling challenge. To do this, a new type of separator, an inflatable tapered diameter separation bed, was developed to study particle motion and separation mechanisms in the bed’s fluid flow field. For 0.5–0.25 mm circuit board particles, metal recovery rates ranged from 87.56 to 94.17%, and separation efficiencies ranged from 87.71 to 94.20%. For 0.25–0.125 mm particles, metal recovery rates ranged from 84.76 to 91.97%, and separation efficiencies ranged from 84.74 to 91.86%. For superfine products (−0.125 mm), metal recovery rates ranged from 73.11 to 83.04%, and separation efficiencies ranged from 73.00 to 83.14%. This research showed that the inflatable tapered diameter separation bed achieved efficient particle separation and can be used to recover fine particles under a wide range of operational conditions. The bed offers a new mechanical technology to recycle valuable materials from discarded printed circuit boards, reducing environmental pollution.

An innovative biotechnology for metal recovery from printed circuit boards

2020 ◽  
Vol 153 ◽  
pp. 104549 ◽  
Author(s):  
Alessandro Becci ◽  
Alessia Amato ◽  
Viviana Fonti ◽  
Dafina Karaj ◽  
Francesca Beolchini
Keyword(s):  
Printed Circuit Boards ◽  
Metal Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Innovative Biotechnology

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

scholarly journals Resources Recovery from Electronic Waste

2020 ◽  
Author(s):  
Mohit Arora
Keyword(s):  
Nitric Acid ◽  
Printed Circuit Boards ◽  
Extraction Efficiency ◽  
Electronic Waste ◽  
Mineral Processing ◽  
Metal Recovery ◽  
Circuit Boards ◽  
Gold Extraction ◽  
Printed Circuit ◽  
Thiosulfate Leaching

Printed Circuit Boards in electronic scrap are richest source of base and precious metals, promoting economic drive for metal recovery. Recovery of these metals is a difficult exercise due to complex nature of electronic waste. India is one of the leading electronic waste processing hubs where more than 95% recyclers are unorganised/non-formal, lacking such a recovery facility. An efficient metal recovery protocol with lesser environmental impact remains unavailable to unorganised recyclers. In current study, an attempt has been made to combine various hydrometallurgical methods to achieve efficient metal recovery from Printed Circuit Boards. Mimicking mineral processing protocols for metal recovery from electronic waste has been a key feature of presented research. Printed Circuit Boards of personal computers were reduced to a size ≤ 2.5 mm and were used as sample for metal recovery. Copper and silver were extracted by selective leaching using Nitric Acid. Maximum extraction efficiency of 96.8% and 99.9% were achieved for copper and silver respectively. Nitric Acid was extracted using solvent extraction method to minimize the environmental damage of remaining waste as well as for reuse in next leaching cycle. Electrodeposition of copper was done on copper cathode with stainless steel and lead anodes with a maximum recovery efficiency of 89.6%. For extraction and recovery of gold and silver, various techniques used in mineral processing were applied in this research. Thiosulfate leaching was chosen for gold extraction due to its proven environment friendly properties. Maximum gold extraction efficiency of 74.3% has been achieved in this work. To recover gold from pregnant solution, zinc cementation approach was used. Up to 85.9% gold was recovered with zinc cementation. Success of thiosulfate leaching and cementation confirms the validity of mineralprocessing techniques in metal recovery from electronic waste. Research in this study can serve as a backbone for potential environmentally sound technology towards efficient metal recovery from electronic waste for small and medium scale recyclers.

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