The invention discloses a method for recovering gold, copper, copper sulfate and copper chloride waste liquid of a waste circuit board, comprising the following steps of: crushing the waste circuit, carrying out acid etching, recovering copper by using a displacement method, purifying gold by using a chloridizing etching method, an ion exchange method and an electrolytic method and the like ...

Copper Facts Copper the Metal Copper Fact 1. Copper is a mineral and an element essential to our everyday lives. It is a major industrial metal because of its high ductility, malleability, thermal and electrical conductivity and resistance to corrosion.

Leaching speed of copper per unit surface area (kgB¶ m-2-1 B¶h) 4.2. Dissolution of Cu in an Ammonia Solution Containing Ammonium Chloride In order to optimize the NH3 concentration for leaching copper, copper plates were immersed and stirred in 1~6 kmol m-3 NH 3 and 1 kmol m-3 NH 4Cl containing 0.5 kmol m-3 Cu(II) at 313 K.

In this study, we propose a multi-step leaching procedure for Cu and Au recovery from discarded PCB. In the first stage, Sulphuric acid leaching of Cu in the presence of sulphuric acid is carried out. In the second step, Au leaching using 2 3 2 − as the lixiviant with Copper as catalyzer in ammoniacal medium is carried out. In Cu leaching step,

The main metal was copper and its initial content was 32.5 wt.%. On sulfuric leaching 90 wt.% of Al, 40 wt.% of Zn and 8.6 wt.% of Sn were extracted, whereas on oxidant leaching tests the extraction percentage of Cu was 100 wt.%, of Zn 60 wt.% and of Al 10 wt.%.

A technology for copper separation is well established through ammonium sulphate leaching, solvent extraction, and electrowinning [13]. The last two steps are recovery of precious metals and separation of nickel and zinc. Fig. 1: Block diagram for metal recovery from PCBs. Goosey & …

The aim of the study was to recover copper and lead metal from waste printed circuit boards (PCBs). The electrowinning method is found to be an effective recycling process to recover copper and lead metal from printed circuit board wastes. In order to simplify the process with affordable equipment, a simple ammonical leaching operation method was adopted. The selected PCBs were incinerated ...

printed circuit board manufacturing. Table 1 shows the amount of waste generated from a typical multilayer printed circuit board process per square meter of board. Solid wastes include edge trim, copper clad, protection film, 1 In this document, the acronym PCB is used for Printed Circuit Boards. This document does not refer

viz. ammonium thiosulfate concentration, copper sulfate concentration, pH and pulp density was studied. A leaching of 56.7% gold was obtained under the optimum condition of 0.1M ammonium thiosulfate, 40 mM copper sulfate, pH: 10-10.5, pulp density: 10 g/L at room temperature and stirring speed of 250 rpm in 8h duration.

E-waste growth rate per annum is around 3–5%, and it is considered as one of the fastest growing waste streams (Cucchiella et al., 2015).As per global e-waste monitor, 53.6 million tons of e-waste were generated in 2019 (Forti et al., 2020).Physical separation, hydrometallurgy, pyrometallurgy and biometallurgy are the major processes employed for recovery of valuable metals …

nism of copper bioleaching from this e-waste by the chemolithotrophs and heterotrophs were eval-uated. 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.

Copper leaching from waste electric cables by biohydrometallurgy Fanny Lamberta,⇑, Stoyan Gaydardzhieva, Grégoire Léonardb, Gregory Lewisc, Pierre-François Bareelc, David Bastina a Laboratory of Mineral Processing and Recycling, University of Liege, Chemin des chevreuils B52, Liege, Belgium bLaboratory of Chemical Engineering, University of Liege, Allee de la Chimie B6a, Liege, …

leaching efficiency of copper from the PCBs. The effects of hydrogen peroxide and sulfuric acid concentration, as well as pulp density, leaching temperature, and time, on copper recovery from PCBs have been studied previously.16,21,29–31 How-ever, the combined effect of these parameters to the leaching efficiency of copper has been rarely stud-

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.

Many non-cyanide copper processes operate between 54–65°C (130–150°F) with air agitation. A typical bath formulation contains 11g/L of copper metal. The pH is around 9.0, while cyanide copper solutions have a pH of at least 11.0. The anode-to-cathode ratio is 2:1, with the same anodes used in cyanide copper solutions.

Copper Leaching Behavior from Waste Printed Circuit Board in Ammoniacal Alkaline Solution Kazuya Koyama 1, Mikiya Tanaka and Jae-chun Lee2 1Metals Recycling Group, Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, Japan

The flowsheet discussed in this study is for treatment of 100 tons per day oxide-sulfide copper ore by the leaching process using sulfuric acid-ferric sulfate solvent. This flowsheet would also be suitable for a larger tonnage by proper sizing of the various units of equipment. The flowsheet contemplates a six to seven day leach-wash cycle with ...

) waste for extraction of metals from electronic waste [14]. Alternative environmental agents to extract non-leaching gold have been studied to recover gold from e-waste. Agents as potassium persulfate (K 2 S 2 O 8) [11] and cupric chloride (CuCl 2) [12] were used to oxidize and leach the metal substrate

Abstract - This paper presents the experimental results for the leaching of printed circuit boards (PCB) from obsolete computers for extracting and recovering tin and copper by means of leaching followed by precipitation. Printed circuit boards were dismantled, cut into small pieces, and fed into a cylinder mill. The

Petter PMH, Veit HM, Bernardes AM (2018) Evaluation of gold and silver leaching from printed circuit board of cellphones. Waste Management 34: 475-482. Hong Y, Valix M (2014) Bioleaching of electronic waste using acidophilic sulfur oxidising bacteria. Journal of Cleaner Production 65: 465-472.

Further dilution time required for copper concentration to level-off at 120 mg at higher DF values (DF 5 and DF 10), could have possibly PCB waste mL-1 HNO3 is longer (approximately 4 hours) as reduced the concentration of the chloride ions and the compared to lower waste load values (30 and 60 mg PCB acidity of the electrolyte which made ...

Therefore, copper leaching rate increases with the increase of their concentrations. However, from Fig. 3, further increasing hydrogen peroxide, copper leaching rate decreases, especially for [BSO 3 HMIm]HSO 4, which decrease from 65.01% to around 1% when hydrogen peroxide adding amount increases from 5 mL to 10 or 15 mL.

It is considered [13,14] that the biological leaching of copper from waste (PCBs) is implemented primarily through an indirect mechanism. Fe 2 (SO 4) 3 created by At. ferrooxidans in the leaching process oxidizes ele-mental copper (contained in the waste) to the copper ion, according to the reaction: (1) (2) Dynamics of bioleaching process can ...

The recovery of valuable metals from waste printed circuit boards (WPCBs) is crucial in order to harness their economic resources, and prevents potential environmental contamination. However, selective extraction of Cu and Zn, and the co-extraction of other metals as impurities at ambient temperature using selected lixiviants such as HCl, H2SO4, HNO3, trifluoromethanesulfonic acid …

To verify that the oxidation of Fe 3+ was the predominant mechanism of the copper extraction from PCBs by bacteria-free cultural supernatant, ferric sulfate solution, bacteria-free cultural supernatant, pure water, and pure media were used to leach 15 g/L PCBs, and the result is shown in Fig. 3. There was a little copper extracted by pure water ...

The leaching speed of copper in an ammonia solution containing ammonium chloride was higher than that in an ammonia solution containing ammonium sulfate. Key words Copper Dissolution, Ammonia Solution, Waste, Leaching, Hydrometallurgical Process 1. Introduction The metals recovery from waste materials is important for

copper oxides have been in common use for some time. Prior to the development of the Sherritt-Gordon process for nickel and cobalt in which copper is recovered as high grade copper sulfide, copper sulfides were economically recovered in a hydrometallurgical process only during the leaching of waste dumps. . Need for Hydrometallurgical Processes

Behnamfard, A., Salarirad, M. & Veglio, F. Process development for recovery of copper and precious metals from waste printed circuit boards with emphasize on …

Leaching of Copper from Waste-Printed Circuit Boards (PCBs) in Sulfate Medium Using Cupric Ion and Oxygen August 2021 Metals - Open Access Metallurgy Journal 11(9):1369

Copper Scrap Recycling. Recycling of copper scrap greatly reduces natural resource exploration as an alternative source of copper metallurgy and has big advantage in investment, production cost and off-gas treatment, thus making the copper scrap smelting projects remunerative. However, due to the wide source range, the copper scrap is ...

Leaching of gold and silver from printed circuit board of mobile phones REM: R. Esc. Minas, Ouro Preto, 68(1), 061-068, jan. mar. | 2015 In system with ammonium thiosul - fate ((NH 4) 2 S 2 O 3), ammonium hydroxide (NH 4 OH), copper (II) sulfate (CuSO 4) and hydrogen peroxide (H 2 O 2) were also evaluated at different molar concentra-tions for ...

Sodium sulfate 5 75.41 12.35 49.36 0 0 0.07 0 1.49 0.17 ... Cu from waste printed circuit board. 5. Conclusion ... Copper leaching behavior from waste printed circuit board in ammoniacal alkaline solution, Mater. Trans. 47(2006)1788 -1792. Title: Selective leaching reagent for the …

investigate the leaching behavior of metals that are leached from 2 to 4 mm PCBs. Additionally, the extent of copper leaching and the leaching of other metals using sulfuric acid and nitric acid was investigated. Because sulfuric acid was ineffective in leaching the …

Comparative study on copper leaching from waste printed circuit boards by typical ionic liquid acids Mengjun Chena,⇑, Jinxiu Huanga, Oladele A. Ogunseitanb, Nengming Zhuc, Yan-min Wangd a Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST), Ministry of Education, Southwest University of Science and Technology, 59 Qinglong Road, ...