Preparation of anion exchange resin by recycling of waste printed circuit boards

RSC Advances ◽  
2015 ◽  
Vol 5 (129) ◽  
pp. 106680-106687 ◽  
Author(s):  
Jianqiu Zhang ◽  
Songhang Liu ◽  
Jinyang Chen ◽  
Jianhua Zu ◽  
Yangjun Wang
Keyword(s):  
Anion Exchange ◽  
Printed Circuit Boards ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
New Method ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

The treatment of the non-metal components of waste printed circuit boards (WPCBs) is very difficult because they are inflexible and insoluble, and thus a new method to convert them into anion exchange resin was studied.

Perspective Method for Regeneration of Spent Solutions from Printed Circuit Boards Etching

2020 ◽  
Vol 989 ◽  
pp. 548-553
Author(s):  
O.Yu. Makovskaya ◽  
A.P. Shevchuk ◽  
Y.V. Anikin
Keyword(s):  
Printed Circuit Boards ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
Acid Etching ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Basic Anion Exchange Resin ◽  
Chlorine Ions ◽  
Basic Anion ◽  
A Current

The process of copper regeneration from spent hydrochloric acid etching solution of printed circuit boards is considered. A combined scheme is proposed, which includes the preliminary removal of excess chlorine ions from the solution, using a highly basic anion exchange resin and the subsequent electrochemical precipitation of copper. A solution contents, g/dm3: 237 Cu, 27 NH4Cl, 11.6 HCl was used. Electrical extraction was performed at a current density of 650 A/m2. The method makes it possible to prevent the emission of chlorine at the anode and ensures the obtaining copper as metal.

Recycling of waste printed circuit boards into ion exchange resin

RSC Advances ◽  
2015 ◽  
Vol 5 (3) ◽  
pp. 2080-2087 ◽  
Author(s):  
Jianqiu Zhang ◽  
Tao Tian ◽  
Jinyang Chen ◽  
Jianhua Zu ◽  
Yangjun Wang
Keyword(s):  
Ion Exchange ◽  
Sulphuric Acid ◽  
Printed Circuit Boards ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Ion Exchange Resins ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Exchange Resins

Ion exchange resins with high IEC and stability are obtained from WPCBs by treatment with sulphuric acid.

LEACHING OF METALS FROM WASTE PRINTED CIRCUIT BOARDS (WPCBs) USING SULFURIC AND NITRIC ACIDS

2014 ◽  
Vol 13 (10) ◽  
pp. 2601-2607 ◽  
Author(s):  
Jae-chun Lee ◽  
Manoj Kumar ◽  
Min-Seuk Kim ◽  
Jinki Jeong ◽  
Kyoungkeun Yoo
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

scholarly journals Effective Recovery Process of Copper from Waste Printed Circuit Boards Utilizing Recycling of Leachate

JOM ◽  
2020 ◽  
Author(s):  
Joona Rajahalme ◽  
Siiri Perämäki ◽  
Roshan Budhathoki ◽  
Ari Väisänen
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Printed Circuit Boards ◽  
Sulfuric Acid Concentration ◽  
Recovery Process ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Acid Consumption

AbstractThis study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. Optimum leaching conditions for copper were found by using 3.6 mol L−1 sulfuric acid, 6 vol.% hydrogen peroxide, pulp density of 75 g L−1 with 186 min leaching time at 20°C resulting in complete leaching of copper followed by over 92% recovery and purity of 99.9% in the electrowinning. Study of chemical consumption showed total decomposition of hydrogen peroxide during leaching, while changes in sulfuric acid concentration were minor. During recirculation of the leachate with up to 5 cycles, copper recovery and product purity remained at high levels while acid consumption was reduced by 60%.

scholarly journals Food Waste-Assisted Metal Extraction from Printed Circuit Boards: The Aspergillus niger Route

2021 ◽  
Vol 9 (5) ◽  
pp. 895
Author(s):  
Carlotta Alias ◽  
Daniela Bulgari ◽  
Fabjola Bilo ◽  
Laura Borgese ◽  
Alessandra Gianoncelli ◽  
...  
Keyword(s):  
Solid State ◽  
Aspergillus Niger ◽  
Food Waste ◽  
Solid State Fermentation ◽  
Printed Circuit Boards ◽  
Electronic Waste ◽  
Metal Extraction ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

A low-energy paradigm was adopted for sustainable, affordable, and effective urban waste valorization. Here a new, eco-designed, solid-state fermentation process is presented to obtain some useful bio-products by recycling of different wastes. Urban food waste and scraps from trimmings were used as a substrate for the production of citric acid (CA) by solid state fermentation of Aspergillus niger NRRL 334, with a yield of 20.50 mg of CA per gram of substrate. The acid solution was used to extract metals from waste printed circuit boards (WPCBs), one of the most common electronic waste. The leaching activity of the biological solution is comparable to a commercial CA one. Sn and Fe were the most leached metals (404.09 and 67.99 mg/L, respectively), followed by Ni and Zn (4.55 and 1.92 mg/L) without any pre-treatments as usually performed. Commercial CA extracted Fe more efficiently than the organic one (123.46 vs. 67.99 mg/L); vice versa, biological organic CA recovered Ni better than commercial CA (4.55 vs. 1.54 mg/L). This is the first approach that allows the extraction of metals from WPCBs through CA produced by A. niger directly grown on waste material without any sugar supplement. This “green” process could be an alternative for the recovery of valuable metals such as Fe, Pb, and Ni from electronic waste.

Physical pre-concentration and ammonium leaching of metal copper from waste printed circuit boards

2021 ◽  
pp. 128512
Author(s):  
Shun-xiang Shi ◽  
Chun-chen Nie ◽  
Hong-hao Chang ◽  
Peng Wu ◽  
Zheng-jie Piao ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards
Sign in / Sign up

Export Citation Format

Share Document