Optimizing acid leaching of copper from the wastewater ...

Heavy metal containing sludge from printed circuit board production (PCB) is not only classified as hazardous waste, but also as a potentially valuable raw material for copper recovery. Since sludge leaching is a significant first step in copper extraction yield via hydrometallurgy, we assessed the optimum copper acid-leaching conditions using a Design of Experiment (DOE) approach (33 full ...

[PDF] GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF …

Currently, the printed circuit boards (PCB) of waste electrical and electronic equipment (WEEE) are attracting interest among researchers for environmental concern reasons and mainly for their content of precious metals such as gold. Thus, this study aims to characterize different types of PCBs from mobile phones in relation to the amount of gold contained, to evaluate alternative leaching ...

Recovery of copper and recycling of acid from the leach ...

Present work is focused on the recovery of metal and recycling of acid from the leach liquor of discarded Printed Circuit Boards (PCBs) using solvent extraction technique. The waste PCBs are ...

A Study on Improvement of Valuable Metals Leaching and ...

The main objective of this study is to recovery valuable metals with metal particle size distributions in waste cell phone PCBs(Printed Circuit Boards) by means of pulverization and nitric acid process. The particle size classifier also was evaluated by specific metal contents. The PCBs were pulverized by a fine pulverizer. The particle sizes were classified by 5 different sizes which were ...

Hydrometallurgical Recovery of Metals from Large Printed ...

The recovery of precious metals from waste printed circuit boards (PCBs) is an effective recycling process. This paper presents a promising hydrometallurgical process to …

Identifying A Hazardous Waste | My Alfred University

A waste is a toxic hazardous waste if a representative sample of the waste tests above the concentrations set by the analytical test Toxicity Characteristic Leaching Procedure (TCLP) A chemical with an oral Lethal Dose (LD50) for a rat of < 500mg/kg. A chemical whose original container identifies the contents as toxic or poisonous.

Effective Recovery Process of Copper from Waste Printed ...

This 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 ...

[PDF] SEPARATION OF COPPER FROM A LEACHING SOLUTION …

Global generation of waste electrical and electronic equipment (WEEE) is increasing quickly. Metals from WEEE can be recovered by using unit operations of chemical engineering. This paper describes a combined hydrometallurgical route (sulfuric oxidant leaching + solvent extraction) to recover copper from printed circuit boards (PCBs). A non-magnetic fraction from comminuted PCBs was used to ...

Selective Copper Recovery by Acid Leaching from Printed ...

The most challenging issue associated with recycling the sludge generated from printed circuit boards (PCBs) is the separation of copper (Cu) from iron (Fe), using multi-stage leaching, or adding oxidizing and precipitating agents. Herein we investigated simple acid leaching to effectively extract copper and limit iron dissolution. Selective copper leaching was achieved with all the acids ...

Electronic waste – an emerging threat to the environment ...

Lee et al. (2009) used organic solvents for the extraction of heavy metals like Fe, Cu, Al, Ni, Au and Ag. Yang et al. (2011) studied chemical leaching of Cu present in waste PCBs with respect to its particle size, by utilizing treated shredded Cu particles of waste PCB with sulfuric acid and hydrogen-peroxide.

An Alkaline Glycine-Based Leach Process of Base and ...

The metals extraction from leaching PCB powder in solutions containing 30 g/L glycine at pH 11.0 and room temperature (23 ± 2 °C) has been studied. Metals extraction from leaching the PCB powder in glycine solutions for 24 h is shown in Table 5. After 24 h, the results show that glycine selectively dissolves base metals and aluminium (Al ...

COPPER EXTRACTION FROM THE DISCARDED PRINTED …

3. Agarwal Perween, Shubhajit Pramanik and Sahu K.K., Recovery of copper from pcb leach solution by solvent extraction, Conf. Proceedings national metallurgical laboratory, csir, jamshedpur - 831007, India (2008). 4. Kazuya Koyama, Mikiya Tanaka and Jae-chun Lee, Copper Leaching Behavior from Waste Printed Circuit Board

Challenges and opportunities in the recovery of gold from ...

An end-of-life printed circuit board (PCB) may contain up to ... tained by milling the waste PCBs and then leaching the powder ... resin can be dissolved using organic solvents such as dimethyl sulfoxide,37 N,N-dimethyl pyrrolidone,38 dimethylformamide, or dimethylacetamide. Amide …

Deep eutectic solvents for cathode recycling of Li-ion ...

DESs are a class of compounds that generally present an unusually high capability of dissolving metal oxides 15,16,17,18.These solvents are eutectic mixtures of …

Policy and Guidance for Polychlorinated Biphenyl (PCBs ...

The Sampling Guidance for 40 CFR 761 subparts M, O, P and R gives visual guidance to help users understand how to sample certain types of PCB waste (e.g., natural gas pipelines, PCB remediation waste after cleanup, non-porous surfaces, and PCB bulk product waste).

Leaching of Au, Ag, and Pd from waste printed circuit ...

In the process, the waste PCBs of mobile phones were pre-treated in supercritical water, then a diluted hydrochloric acid leaching (HL) process was used to recovery the Cu, whose leaching efficiency was approximately , finally the resulting residue was subjected to the iodine-iodide leaching process for recovering the Au, Ag, and Pd.

Recovery of copper and recycling of acid from the leach ...

The waste PCBs are segregated and processed for leaching under the optimized condition developed by our group at CSIR-NML. Further, the systematic basic studies were carried out to recover nitric acid (HNO 3 ) and copper (Cu) from the leach liquor of PCBs using tri-butyl phosphate (TBP) and 2-hydroxy-5-nonylacetophenone oxime (LIX 84IC ...

RECOVERY OF COPPER FROM PCB LEACH SOLUTION BY …

RECOVERY OF COPPER FROM PCB LEACH SOLUTION BY SOLVENT EXTRACTION A. Agrawal, M. Perween, Shubhajit Pramanik and K.K. Sahu National Metallurgical Laboratory, CSIR, Jamshedpur - 831007, India ABSTRACT Discarded computers, mobiles and other consumer electronics (e-waste) are the fastest growing portion of the

Challenges and opportunities in the recovery of gold from ...

The oxidation of waste PCBs using supercritical water (T > 647 K, P > 218 atm) and sodium hydroxide as a first step for the removal of harmful organic species originating from the degradation of toxic matter (e.g. brominated flame retardants) from waste PCBs has been reported. 70 This process was later modified to enhance the leaching of copper ...

Studies on Metal (Cu and Sn) Extraction from the Discarded ...

Studies on Metal (Cu and Sn) Extraction from the Discarded Printed . Circuit Board by Using Inorganic Acids as Solvents. Vijayaram R* and Dr. Chandramohan K ... PCB leach solution by solvent extraction. National Metallurgical Laboratory 20-22. ... Guo J, Xu Z (2009) Recycling of waste printed circuit board: A review of current technologies and ...

Process development for recovery of copper and precious ...

A novel hydrometallurgical process was proposed for selective recovery of Cu, Ag, Au and Pd from waste printed circuit boards (PCBs). More than 99% of copper content was dissolved by using two consecutive sulfuric acid leaching steps in the presence of …

Selective Leaching of Valuable Metals from Waste Printed ...

Leaching of Metals with H 2 SO 4 Sulfuric acid was used as the leaching solvent to extract the base metals, with H 2 O 2 as an oxidant. Hydrogen per-oxide added to H 2 SO 4 solution was used to dissolve Cu, Fe, Zn, and Ni from the PCBs. The remaining solid mate-rial was filtered and leached in the next phase. Leaching with the H 2 SO

EXTRACTION OF METALS FROM THE DISCARDED PRINTED …

After leaching of metals dissolved solution is taken for the final recovery of metals. Keywords: E- waste, Leaching, PCB, recycling, recovery, Hydrometallurgy, 1. Introduction Consumer electronics i.e. desktop, laptop and mobile phones have become an integral part of daily life and revolutionized the

Microbial Processing of Waste Shredded PCBs for Copper ...

The leach liquor obtained from the optimized leaching process was subjected to separation and purification of copper as >99% pure copper sulfate using Acorga M5640 by solvent extraction. Keywords: shredded PCB; copper; microbial leaching; solvent extraction; copper product

Recovery of valuable metals from waste printed circuit ...

niveus were used for the bioleaching of metals from waste printed circuit boards. Bio-leaching of valuable metals was performed in one‐step, two‐steps and spent medium approaches using A. niveus. In the absence of waste printed circuit boards (WPCBs), the dry cell weight of A. niveus was higher when compared with the presence of WPCBs.

Proposed Text - townhall.ia.gov

9VAC20-81-10 Definitions. The following words and terms when used in this chapter shall have the following meanings unless the context clearly indicates otherwise: "Accumulated sp

Metals | Free Full-Text | Leaching and Selective Recovery ...

Printed circuit boards (PCBs), a typical end-of-life electronic waste, were collected from an E-waste recycling company located in the Netherlands. Cu and precious metal concentration analyses of the powdered PCBs confirm that the PCBs are multimetallic in nature, rich, but contain high concentrations of Cu, Au, Ag, Pd, and Pt. Ferric sulfate concentration (100 mM), agitation speed (300 rpm ...

(PDF) Leaching of gold, silver and accompanying metals ...

This type of leaching is a better leaching procedure for recovery of gold and silver from PCB waste than the classical toxic cyanide leaching. 84 …

Oil, Solvents, and Wastes – Phase Separation Science

Oil, Solvents, and Wastes. Phase Separation Science analyzes samples oil, solvent and waste samples to determine if they meet state or federal cleanup standards under the: Resource Conservation and Recovery Act (RCRA). In addition to regulated cleanup levels, disposal facilities that take in contaminated soils have their own requirements.

Chemical Recycling of Printed Circuit Board Waste by ...

Printed circuit board (PCB) waste from desktop computer monitors was used for the investigation. The capacitors, conductors, resistors and all removable materials were dismantled, and the boards were crushed into smaller particle size as shown in Fig. 1.A further grinding process was applied to decrease the particle size below 2 mm to produce a more homogenous mixture.

SEPARATION OF COPPER FROM A LEACHING SOLUTION OF …

Keywords: Waste electrical and electronic equipment (WEEE), recycling, printed circuit boards (PCBs), leaching, solvent extraction. INTRODUCTION Waste of electrical and electronic equipment (WEEE) is increasing quickly. In 2014 alone, the global generation of WEEE was 41.8 million tons (5.9 kg per inhabitant), while in 2010 the electrical

Leaching of metals from printed circuit boards using ionic ...

12%The rise in the electronics industry has impacted the environment through the large volumes of waste that are improperly disposed of and the growing demand for precious and rare metals from natural sources. Leaching of copper, cobalt, gold, and silver from printed circuit boards of waste cellular phone has been carried out using imidazolium cation-based ionic liquids …

The PCB Recycling Process in Design and Electronics Production

PCB design and manufacturing coincides with social and ecological responsibility. PCB recycling processes must meet global requirements and comply with global directives. Controlling e-waste must become a priority for the PCB industry. My family and I live in a rural area, miles away from the nearest town.

Fact Sheet: Sources of Polychlorinated Biphenyls

present, including waste materials and soils from remediation sites. Wastewater treatment plant sludge Derived from atmospheric deposition and stormwater, water supply systems, leaks and spills, leaching from coatings and plastics containing PCBs, PCBs in food and human waste. Sources: EIP Associates (1997), EPA (2002), UNEP Chemicals (1999)

Leaching in Metallurgy and Metal Recovery

The Radomiro Tomic mine in Chile is a prime example of the success of copper heap leaching, followed by solvent extraction and electrowinning. Heap leaching technology is important to the future of metal recovery, since it can be applied to extract precious and base metals sitting in abandoned tailings, and/or waste management sites.

per sulfate leaching of copper from pcb waste

per sulfate leaching of copper from pcb waste The Extraction of Gold from Ewaste by Hydrometallurgy Ewaste production in great amounts and its problems, which challenge the field of Waste and Environment Management, stem from the increase in the production of electronic appliances, diversityseeking consumers, and perishable products.

Extraction of Tin and Copper by Acid Leaching of PCBs ...

Printed circuit board (PCB) waste is generally dumped as a landfilling or treated pyrometallurg ically, which consumes enormous power, generates hazardous gases and also destroys valuable PCB co mponents. For recycling of the components, they must be separated from the printed circuit boards wh ich is a cu mbersom e task. For its simplification, the rate of d issolution of solder with acids ...

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