Preparation of Cuprous Oxide from Industrial Leaching Liquid Using the Microwave Thermo-Ethanol Method

2009 ◽  
Vol 79-82 ◽  
pp. 2131-2134
Author(s):  
Han Yu Lin ◽  
Chao Yin Kuo ◽  
Chung Hsin Wu ◽  
Tsai Hsung Lin
Keyword(s):  
Cuprous Oxide ◽  
Inductively Coupled Plasma ◽  
Printed Circuit Boards ◽  
Optical Emission ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Circuit Boards ◽  
Prepared Powder ◽  
Printed Circuit ◽  
Inductively Coupled

This study investigates the use of the microwave thermo-ethanol method to recover cuprous oxide from waste liquid that contains heavy metals, formed by the leaching of acid from sludge of printed circuit boards. An XRD analysis yields main peaks of cuprous oxide 2θ = 36.45° and 42.35°. SEM analysis indicates that the cuprous oxide was octahedral when 0.1 M glucose, or a higher concentration, was added to the waste liquid. The purity of prepared powder of cuprous oxide was analyzed using an inductively coupled plasma-optical emission spectrometer (ICP-OES), and the purity of the prepared powder of cuprous oxide was found to exceed 70%. Accordingly, in this study, metallic resources were regenerated.

Determination of Elemental Content in Solder Mask Samples Used in Printed Circuit Boards Using Different Spectroanalytical Techniques

2018 ◽  
Vol 72 (8) ◽  
pp. 1205-1214 ◽  
Author(s):  
Marco Aurelio Sperança ◽  
Alex Virgilio ◽  
Edenir Rodrigues Pereira-Filho ◽  
Francisco Wendel Batista de Aquino
Keyword(s):  
Inductively Coupled Plasma ◽  
Printed Circuit Boards ◽  
Hazardous Substances ◽  
Emission Spectrometry ◽  
Elemental Content ◽  
The European Union ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Inductively Coupled

Solder masks are essential materials used in the manufacture of printed circuit boards (PCB). This material protects PCBs against several types of damage and performance failure. In this study, the capabilities of laser-induced breakdown spectroscopy (LIBS) were investigated for the direct analysis of solder masks typically commercialized for homemade PCB production, and inductively coupled plasma–optical emission spectrometry (ICP-OES) was used to obtain a chemical profile for the target analytes Al, As, Ba, Cd, Co, Cr, Cu, Fe, Hg, Mg, Mn, Ni, Pb, Sb, Sn, and Zn. Inductively coupled plasma–mass spectrometry (ICP-MS) was also employed for the determination of potentially toxic elements, such as As, Cd, Cr, Pb, and Hg. In addition to the qualitative information that may be useful for obtaining the spectral profile related to the raw materials present in solder masks formulations, LIBS was also applied for major elements (Al, Ba, Cu, Fe, Mg, and Zn) determination, but due to the low sensitivity, the obtained results were only semi-quantitative for Ba. Regarding Cd, Cr, Hg, and Pb, the samples analyzed were following the restriction of hazardous substances (RoHS) directive of the European Union.

scholarly journals COPPER AND LEAD RECOVERY FROM DISCARDED PRINTED CIRCUIT BOARDS BY ELECTROLYSING LEACHED SOLUTION

2018 ◽  
Vol 55 (1B) ◽  
pp. 129
Author(s):  
Tran Thi Phuong Thao
Keyword(s):  
Printed Circuit Boards ◽  
Recovery Process ◽  
Xrd Analysis ◽  
Composition Analysis ◽  
Copper Electrodeposition ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Electrochemical Parameters ◽  
Lead Recovery ◽  
Acidic Dissolution

Results of copper and lead recovery from discarded printing circuit boards (PCB) by acidic dissolution and electrodeposition are presented. A preliminary procedure of the recovery process is proposed with the following steps: disposal of the mounted electrical elements, cleaning, grinding, iron separation for grains screening, metal dissolution, and electrolysis. The composition analysis is performed to define suitable electrochemical parameters for recovery. XRF and AAS techniques are used for preliminary estimation of metal content in leached solution. LSV method is implemented to establish parameters for copper electrodeposition. The product quality is evaluated through XRD analysis. The high recovery efficiencies, 97.61% and 96.59 % for copper (in metallic form) and lead (in dioxide form), respectively, were reached.  

scholarly journals Multi-Analytical Investigation of Stains on Dimension Stones in Master Valentim’s Fountain, Brazil

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 465 ◽  
Author(s):  
Roberto da Conceição Ribeiro ◽  
Patrícia Marques Ferreira de Figueiredo ◽  
Daniel Silva Barbutti
Keyword(s):  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Xrd Analysis ◽  
Analytical Investigation ◽  
Main Element ◽  
Emission Spectrometry ◽  
X Ray ◽  
Inductively Coupled ◽  
Light Staining ◽  
Metallic Plates

Master Valentim’s fountain has become an important historical patrimony for Brazil, being portrayed by famous artists, among them Jean-Baptiste Debret. In 1938, it was registered as cultural heritage by the Brazilian National Historical and Artistic Heritage Institute (IPHAN), and in 1990 it was subjected to excavation and restoration works. The fountain was built in Gneiss and Lioz limestone, with metallic plates and mortar connecting the Gneiss blocks. Currently, deteriorations in the fountain stones can be observed, such as light stains and some aesthetic modifications caused by inadequate restorations. Petrography, X-ray fluorescence (XRF), XRD, physical properties, colorimetry, electrical conductivity, inductively coupled plasma optical emission spectrometry (ICP-OES), scanning electron microscopy-energy dispersive X-ray (SEM-EDX), and TGA were performed in order to characterize the Gneiss blocks, the metallic plates, and the stones used in previous restorations, as well as light stains observed on the Gneiss blocks. The petrography and XRD analyses inferred that the light stains may have been caused by the formation of an insoluble salt as a result of the association of the lead from the plates with other elements. The XRD analysis on the light staining area indicated the presence of cerussite (PbCO3) and anglesite (PbSO4), which are the probable cause of the light stains. The SEM-EDX results suggested that sulfur is the main element associated to lead.

Comparison of Leaching Processes of Gold and Copper from Printed Circuit Boards of Waste Mobile Phone

2014 ◽  
Vol 955-959 ◽  
pp. 2743-2746 ◽  
Author(s):  
Jian Feng Yin ◽  
Si Hui Zhan ◽  
He Xu
Keyword(s):  
Mobile Phone ◽  
Inductively Coupled Plasma ◽  
Printed Circuit Boards ◽  
Printed Circuit Board ◽  
Electronic Waste ◽  
Precious Metals ◽  
Optical Emission ◽  
Optimal Choice ◽  
Circuit Board ◽  
Printed Circuit

Waste mobile phone has become the largest number of electronic waste, and recycling of metals from mobile phone would ensure resource recycling and reduce environmental degradation. Based on the contents of metals analyzed by Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES), containing copper and precious metals such as gold, the paper compared the extraction processes of gold, copper from waste mobile phone printed circuit board (PCB). In this study, two processes, nitric acid and thiourea (NT), sulfuric acid-hydrogen peroxide and iodine (SAHPI) were used to leach copper and gold, respectively. The recovery rate of copper was found to be 96.42%, and 94.3% of the gold was leached in the former process. Similar trends were obtained for the leaching of copper and gold in the latter process, but it was lower that about 95.27% of copper was recycled, while 93.4% of gold were leached. Both the two processes were nontoxic and non-cyanide system. However, thiourea is not stable and easy to decompose in alkaline solution, and the technology has disadvantage of instability. Iodine leaching on the other hand is comparatively a environmental process. Therefore, the optimal choice is the combined process of SAHPI method, while further research is required to develop cost effective and environmentally friendly processes.

scholarly journals Physicochemical Characterization of the Siddha Metallo Mineral Drug - Veera Aya Chenduram (VAC)

2020 ◽  
Vol 11 (4) ◽  
pp. 6085-6088
Author(s):  
Sridevi J ◽  
Madhavan R ◽  
Prasad V V P ◽  
Kanakavalli K
Keyword(s):  
Inductively Coupled Plasma ◽  
Ph Value ◽  
Physicochemical Characterization ◽  
Optical Emission ◽  
Sem Analysis ◽  
Water Soluble ◽  
Emission Spectrometry ◽  
Icp Oes ◽  
Inductively Coupled ◽  
Plasma Optical Emission Spectrometry

Veera ayachenduram (VAC) is a metallo-mineral drug cited in Siddha text literature KannusamiyamparambaraiVaithiyam. The study aimed to standardises the VAC by evaluating its physicochemical characters such as colour, ash value, pH value analyses the heavy metal composition in modern instrumental techniques. Inductively coupled plasma optical emission spectrometry (ICP-OES) and to find out the particle size through scanning electron microscopy (SEM) and. The total ash value was found to be 7.7% w/w, acid-insoluble ash value is 1.25% w/w, water-soluble ash value is 25.32% w/w, and The pH value is 6.5. The ICP-OES reveals that heavy metals such as mercury, lead, arsenic, and cadmium are within the limit. High-resolution SEM analysis of the drug indicated the existence of nanoparticles.

scholarly journals Chemical exploratory analysis of printed circuit board (PCB) using inductively coupled plasma optical emission spectrometry (ICP OES): data treatment and elements correlation

Detritus ◽  
2020 ◽  
pp. 131-139
Author(s):  
Jeyne Castro ◽  
Rodrigues Pereira-Filho Edenir
Keyword(s):  
Inductively Coupled Plasma ◽  
Printed Circuit Board ◽  
Optical Emission ◽  
Exploratory Analysis ◽  
Circuit Board ◽  
Emission Spectrometry ◽  
Icp Oes ◽  
Printed Circuit ◽  
Inductively Coupled ◽  
Plasma Optical Emission Spectrometry

Electronic waste is the fastest growing class of residue in the world. This material presents several electric and electronic equipment (EEE) with a huge amount of base, valuable and toxic elements, thus increasing its recycling interest. This study is aimed to perform an exploratory analysis of printed circuit board (PCB) using Inductively coupled plasma optical emission spectrometry (ICP OES). A PCB from hard disk (HD) was split in 77 sub-samples using a lathe following by mineralization process. This step was conducted without milling process. So, the sub-samples were weighted and mixed with concentrated aqua regia solution, followed by mineralization using microwave oven radiation. Twenty elements were determined by ICP OES (Al, Au, Ba, Ca, Co, Cr, Cu, Fe, Mg, Mn, Nd, Ni, Pb, Pd, Pt, Sb, Sn, Ti and Zn), and Flame atomic absorption spectrometry - FAAS (Ag). With the concentration results, several graphical analyzes were performed: (1) scores map and loading plot; (2) correlation plot and; (3) PCB element distribution maps. With this exploratory analysis, it was possible visualize and understand the data, observing correlations among the elements, how close these correlations are and how is this correlation around the PCB components. This strategy was a good way to observe the PCB complexity and the importance of recycling these materials.

A Novel Route for Copper Recovery from Waste Printed Circuit Boards via Mechanochemistry

2015 ◽  
Vol 768 ◽  
pp. 569-575
Author(s):  
Zhi Yuan Ou ◽  
Jin Hui Li
Keyword(s):  
Copper Sulfide ◽  
Printed Circuit Boards ◽  
Milling Time ◽  
Iron Sulfide ◽  
Xrd Analysis ◽  
Copper Recovery ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
First Time

This paper mainly introduces a novel route for copper recovery from waste printed circuit boards (WPCBs) via mechanochemistry. Copper in the crust is most commonly present as copper-iron-sulfide and copper-sulfide minerals (about 80%) and there exist many methods to extract copper from cooper ores in mineral engineering. It seems an alternative to transform the metallic components in obsolete materials to their corresponding compounds common in nature. By means of mechanochemistry, copper and sulfur were verified to form into copper sulfide in the model experiment, where, meanwhile, the optimal ball milling time was determined (20 minutes). In the real experiment, WPCB fragments and sulfur were mixed and ground for 20 minutes, no copper was detected by XRD analysis but copper sulfide was left. After leaching in sulfuric acid (3M) and hydrogen peroxide (30 wt%), the yield of copper reached nearly 95% and, also, resin was conserved for further utilization. This paper, for the first time, reports the green recovery route combining mechanical activation and sulfurization and may provide an alternative in other studies of metal recovery.

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