scholarly journals Selective leaching of copper from waste printed circuit boards (PCBs) using glycine as a complexing agent

2021 ◽  
Keyword(s):  
Printed Circuit Boards ◽  
Size Fraction ◽  
Complexing Agent ◽  
Copper Extraction ◽  
Circuit Boards ◽  
Selective Leaching ◽  
Ambient Conditions ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Copper Leaching

<p>In this research, the selective leaching of copper from waste printed circuit boards (PCBs) using glycine as a complexing agent was investigated. PCBs were pulverized and sieved, which allowed obtaining a PCBs powder of particle size fraction ≤ 1mm. The PCBs powder has been characterized by several techniques before and after leaching. In order to understand the copper extraction process, the reaction mechanisms, and to determine the optimal leaching parameters, the effects of a range of parameters during copper leaching were investigated, including leaching time, solid-to-liquid ratio, mechanical stirring rate, leaching temperature and glycine concentration. Copper leaching from PCBs waste powder was identified as a complex four-stage gas-liquid-solid process that is carried out slowly under ambient conditions. Glycine shows a very significant selectivity for copper during leaching process allowing dissolving copper from PCBs waste with a percentage of 92.8% under ambient conditions.</p>

scholarly journals Effect of Graphite on Copper Bioleaching from Waste Printed Circuit Boards

Minerals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 79 ◽  
Author(s):  
Linlin Tong ◽  
Qianfei Zhao ◽  
Ali Kamali ◽  
Wolfgang Sand ◽  
Hongying Yang
Keyword(s):  
Printed Circuit Boards ◽  
Acid Leaching ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Copper Leaching ◽  
Initial Ph ◽  
Efficient Extraction ◽  
Bacteria Culture ◽  
The Impact

The efficient extraction of copper as a valuable metal from waste printed circuit boards (WPCBs) is currently attracting growing interest. Here, we systematically investigated the impact of bacteria on the efficiency of copper leaching from WPCBs, and evaluated the effect of graphite on bioleaching performance. The HQ0211 bacteria culture containing Acidithiobacillus ferrooxidans, Ferroplasma acidiphilum, and Leptospirillum ferriphilum enhanced Cu-leaching performance in either ferric sulfate and sulfuric acid leaching, so a final leaching of up to 76.2% was recorded after 5 days. With the addition of graphite, the percentage of copper leaching could be increased to 80.5%. Single-factor experiments confirmed the compatibility of graphite with the HQ0211 culture, and identified the optimal pulp density of WPCBs, the initial pH, and the graphite content to be 2% (w/v), 1.6, and 2.5 g/L, respectively.

A New Technology for Recovery of Metals from Waste Printed Circuit Boards

2014 ◽  
Vol 675-677 ◽  
pp. 698-703 ◽  
Author(s):  
Wei Liu ◽  
Chao Liang ◽  
Wen Qing Qin ◽  
Fen Jiao
Keyword(s):  
Printed Circuit Boards ◽  
Size Range ◽  
New Technology ◽  
Shaking Table ◽  
Copper Recovery ◽  
Copper Extraction ◽  
Circuit Boards ◽  
Pressure Oxidation ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

Recycling of metallic fractions from waste printed circuit boards (PCBs) using gravity separation and hydrometallurgy was investigated. The obtained research fruits were listed as follows: (1) When being pulverized to finer than 0.4mm, waste PCBs could be generally dissociated from plastics. (2) Shaking table was shown to be suitable for processing pulverized PCBs. Pulverized PCBs containing 6.97% copper was enriched to 33.55% in a single operation and the copper recovery was 90.3% in the best size range of separation. (3) Pressure oxidation leaching was shown to be effective for separating copper from aluminum and tin. The leaching extraction of aluminum and tin were 86.6% and 96.3%, copper extraction was 1% or less under the optimal conditions.

scholarly journals Assessment of sampling and chemical analysis of waste printed circuit boards from WEEE: gold content determination

10.30544/427 ◽  
2019 ◽  
Vol 25 (2) ◽  
pp. 171-182
Author(s):  
Martina Laubertova ◽  
Marcela Malindzakova ◽  
Jarmila Trpcevska ◽  
Natasa Gajic
Keyword(s):  
Chemical Analysis ◽  
Mobile Phones ◽  
Printed Circuit Boards ◽  
Size Fraction ◽  
Heterogeneous Materials ◽  
Sampling Procedure ◽  
Gold Content ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

Waste printed circuit boards (WPCBs) from discarded mobile phones and smartphones are considerably heterogeneous materials with a high gold content (approx. 490 grams per ton). The aim of our chemical analysis of samples of WPCBs was to determine the amounts of gold using open acid digestion and atomic absorption spectrometry (HR CS AAS). The test samples designated for chemical analysis must genuinely represent the bulk WPCBs from which they are taken. This study aimed to develop a correct sampling procedure to analyze the heterogeneous materials from printed circuit boards; explicitly concerning the influence of particle size on the precision of chemical analysis of WPCBs from discarded mobile phones. Chemical analysis of the representative sample of WPCBs with a grain size fraction of d ≤ 200 μm determined that the gold content was 475 g∙t-1 with a low variation coefficient and low dispersion which indicates very high accuracy of the designed sampling procedure.

Copper extraction from waste printed circuit boards by glycine

2020 ◽  
Vol 253 ◽  
pp. 117463
Author(s):  
Yunhui Han ◽  
Xiaoxia Yi ◽  
Rui Wang ◽  
Jinfeng Huang ◽  
Mengjun Chen ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Copper Extraction ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

scholarly journals Comparative study on copper leaching from waste printed circuit boards by typical ionic liquid acids

2015 ◽  
Vol 41 ◽  
pp. 142-147 ◽  
Author(s):  
Mengjun Chen ◽  
Jinxiu Huang ◽  
Oladele A. Ogunseitan ◽  
Nengming Zhu ◽  
Yan-min Wang
Keyword(s):  
Ionic Liquid ◽  
Comparative Study ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Copper Leaching

Recovery of Copper from Bio-Leaching Solutions of Waste Printed Circuit Boards Waste by Solvent Extraction Using RE609 and N902

2010 ◽  
Vol 113-116 ◽  
pp. 2228-2231 ◽  
Author(s):  
Cheng Long Zhang ◽  
Wang Dong Fang ◽  
Yu Chen ◽  
Jing Wei Wang ◽  
Jian Feng Bai
Keyword(s):  
Solvent Extraction ◽  
Printed Circuit Boards ◽  
Ph Value ◽  
Copper Extraction ◽  
Equilibration Time ◽  
Circuit Boards ◽  
Extractant Concentration ◽  
H2so4 Concentration ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards

According to the properties of bioleaching solutions of printed circuit boards (PCBs), copper(Ⅱ) in the leaching solution were recovery by solvent extraction with N902 and RE609. The influence of equilibration time，extractant concentration，O/A ratios，pH value on copper(Ⅱ) extraction and sulphuric acid concentration on copper(Ⅱ) stripping had been studied. Extraction of copper increased with increasing extractant concentration with both the extractants. More than 97.45% of copper can be extracted from a typical bioleaching solution of PCBs after copper extraction was carried out using 10% N902 diluted in kerosene at O/A ratio of 1:1, while 97.14% of copper can be extracted using 20% RE609 diluted in kerosene at O/A ratio of 1:1. The stripping of copper loaded N902 and RE609 increased with increasing H2SO4 concentration, but stripping of the latter was lower than the former.More than 93.57% and 90.29%of copper can be stripped from the loaded N902 and RE609 stripped at 1:1 phase ratio with 1.8 M H2SO4 in a single stage.

Selective Leaching of Valuable Metals from Waste Printed Circuit Boards

2003 ◽  
Vol 53 (7) ◽  
pp. 897-902 ◽  
Author(s):  
Chi Jung Oh ◽  
Sung Oh Lee ◽  
Hyung Sik Yang ◽  
Tae Jun Ha ◽  
Myong Jun Kim
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Selective Leaching ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Valuable Metals
Sign in / Sign up

Export Citation Format

Share Document