Fast copper extraction from printed circuit boards using supercritical carbon dioxide

Calgaro, Camila O.; Schlemmer, Diego Felipe; Silva, M.D.C.R. da; Maziero, Eluize Vayne; Tanabe, Eduardo Hiromitsu; Bertuol, Daniel Assumpção

doi:10.1016/j.wasman.2015.05.017

Cited by 93 publications

(23 citation statements)

References 35 publications

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“…It was clearly evident that higher pulp densities resulted in lower extraction rates may be due to restrained air distribution. 36 Another notable reason could be the toxicity of the metal ions which may restrict the bacterial activity. The poisoning effect of the nonmetallic portions and plastics present along the CPCB sample may also hinder the leaching performance of the bacterium.…”

Section: Resultsmentioning

confidence: 99%

Neural network prediction of bioleaching of metals from waste computer printed circuit boards using Levenberg‐Marquardt algorithm

Annamalai

Gurumurthy

2020

Computational Intelligence

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The applicability of artificial neural network (ANN) to predict the bioleaching of metals using from computer printed circuit boards (CPCB) and the influence of process parameters were studied. The influence of process parameters initial pH (1.6-2.4), pulp density (2%-13%), and the initial volume of Inoculum (5%-25%) were investigated on the rate of bioleaching of metals from CPCB. Network inputs were fed as initial pH, pulp density, and inoculum volume and with the extraction of Cu, Ag, and Au as output. The ANN was developed using the Levenberg-Marquardt algorithm and trained for modeling and prediction. The most fitting architectures for Cu, Ag, and Au were [

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Section: Resultsmentioning

confidence: 99%

Neural network prediction of bioleaching of metals from waste computer printed circuit boards using Levenberg‐Marquardt algorithm

Annamalai

Gurumurthy

2020

Computational Intelligence

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“…The result is in accordance with the results of other authors who used inorganic acids. For example, Calgaro et al, who used sulfuric acid to recycle copper from WPCBs, reported that the copper leaching rate sharply increases when solid/liquid ratio decreases from 1/10 to 1/30 [15]. Fig.…”

Section: Effect Of Solid/il Ratiomentioning

confidence: 99%

Copper Recovery From Waste Printed Circuit Boards And The Correlation Of Cu Pb Zn By Ionic Liquid

Li¹,

Chen²

2017

Environ. Protect. Eng.

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Waste printed circuit boards (WPCBs) contain not only harmful materials but also many valuable resources, especially metals, which attracts more and more attention from the public. In this study, a sulfonic acid functionalized ionic liquid ([BSO3HPy]OTf) was used to recycle copper from WPCBs. Zinc and lead, represented as typical heavy metals, were chosen to study the leaching behavior and their relation to copper. Five factors such as particle size, ionic liquid (IL) concentration, H2O2 dose, solid to IL ratio and temperature were investigated in detail. The results showed that copper leaching rate was high, up to 99.77%, and zinc leaching rate reached the highest value of 74.88% under the optimum conditions. Lead cannot be leached effectively and the leaching rate was mostly low than 10%, which indirectly indicated that [BSO3HPy]OTf has a good selectivity to lead. Besides, the interaction of copper, lead and zinc was characterized macroscopically by means of statistical methods. The Spearman correlation analysis showed that copper and zinc had a highly positive correlation. Lead had little relation to copper, which to some extent indicated that the effect of zinc on copper leaching behavior was bigger than that of lead. 56F. LI, M. CHEN compared to 39.8 million metric tons in 2013, reaching to 41.8 million metric tons. However, the recycle of global e-waste is less than one in six in 2014 [3].Waste printed circuit boards (WPCBs) are the basic components of almost all WEEE, e.g., household appliances, personal computers and mobile phones. Thus, the recovery of WEEE is more inclined to the recycling of WPCBs [4]. WPCBs consist of environmentally poisonous materials such as persistence organic pollutants (POPs) and heavy metals (Pb, Cd, Cr). If not treated appropriately, it could badly threaten environment and human health [5]. In other sides, electronic wastes as the effective secondary resources contain many valuable substances. For example, a typical WPCBs constitute by more than 70 wt. % non-metal (i.e., plastic, resins, glass fibers) and metals (copper 16 wt. %, iron 3 wt. %, nickel 2 wt. %, silver 0.05 wt. %, gold 0.03 wt. % and palladium 0.01 wt. %) [6]. Generally copper content in WPCBs is much higher than that of other metals, and the market demand for copper increases year and year [7], which makes copper an important economic driver. Therefore, the recycling of WPCBs is an urgent environmental problem to be solved not only from the perspective of environmental protection but also the resource reuse.Many researchers have studied the recycling of WPCBs, including the mechanical--physical process [8,9], pyrometallurgy [10], hydrometallurgy [11,12] and biometallurgy [13,14]. The mechanical-physical process is the most widely used for the industrial treatment but it is usually as the preparation due to the limitation of metal alloy separation. The development of pyrometallurgy, a traditional technology for recycling precious metals from WPCBs, is restricted by the emission of harmful gases and highenergy con...

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“…Perkembangan produk elektronik yang semakin cepat, menghasilkan lebih banyak limbah elektronik. Telepon genggam (handphone) merupakan salah satu produk elektronika dengan periode singkat karena perkembangan produknya yang begitu cepat, dan memiliki komponen utama berupa PCB [5]. Limbah elektronik, terutama limbah Printed Circuit Board (PCB) mengandung material tembaga, yang tidak hanya membawa ancaman ekologis, tetapi juga menyebabkan pemborosan sumber daya alam [6].…”

Section: Pendahuluanunclassified

Shielding Elektromagnetik Tembaga dari Proses Elektrolisis Air Limbah Industri Printed Circuit Board

Wirapraja¹,

Cahyono²,

Ali³

2020

JTBBT

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Some electronic products have high electromagnetic interference so that it gives a negative impact on the electronic devices around it. The use of electromagnetic shielding is a solution to reduce the value of electromagnetic radiation interference from electronic products. The research conducted includes the manufacture of electromagnetic shielding from copper material resulting from the electrolysis process of PCB (Printed Circuit Board) industrial wastewater and analyzing the effect of electromagnetic shielding from copper waste on the value of radiation emission. Electromagnetic shielding is made of vinyl which is coated with copper as a result of the electrolysis of PCB industrial wastewater. The measurement results show that electromagnetic shielding from copper waste can reduce radiation emissions. The use of electromagnetic shielding from copper waste is effective at frequencies from 250 to 350 MHz with a decrease in the quasi-peak value of 38.02 dB. The measurements with horizontal antenna polarization show that the margin of radiation emission value is higher comparated to vertical antenna polarization.Sebagian produk elektronika memiliki gangguan interferensi elektromagnetik yang tinggi, sehingga berdampak kurang baik terhadap perangkat elektronika di sekitarnya. Pemanfaatan shielding elektromagnetik menjadi solusi untuk mengurangi nilai gangguan radiasi elektromagnetik yang dimiliki oleh produk elektronika. Penelitian yang dilakukan meliputi pembuatan shielding elektromagnetik dari bahan tembaga hasil dari proses elektrolisis limbah industri PCB (Printed Circuit Board) dan melakukan analisa pengaruh shielding elektromagnetik dari limbah tembaga terhadap nilai emisi radiasi. Shielding elektromagnetik terbuat dari bahan vinyl yang dilapisi dengan tembaga hasil elektrolisis limbah cair industri PCB. Hasil pengukuran menunjukkan bahwa shielding elektromagnetik dari limbah tembaga dapat menurunkan emisi radiasi. Penggunaan shielding elektromagnetik dari limbah tembaga efektif di frekuensi 250 – 350 MHz dengan penurunan nilai quasi-peak sebesar 38,02 dB. Pada pengukuran dengan polarisasi antena horisontal, margin nilai emisi radiasi lebih tinggi jika dibandingkan dengan polarisasi antena vertikal. Kata Kunci: Shielding elektromagnetik, Emisi radiasi, Tembaga, PCB

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Fast copper extraction from printed circuit boards using supercritical carbon dioxide

Cited by 93 publications

References 35 publications

Neural network prediction of bioleaching of metals from waste computer printed circuit boards using Levenberg‐Marquardt algorithm

Neural network prediction of bioleaching of metals from waste computer printed circuit boards using Levenberg‐Marquardt algorithm

Copper Recovery From Waste Printed Circuit Boards And The Correlation Of Cu Pb Zn By Ionic Liquid

Shielding Elektromagnetik Tembaga dari Proses Elektrolisis Air Limbah Industri Printed Circuit Board

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