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تشنغتشو ، الصين
gold leaching mobile
智能手机线路板中贵金属资源化价值评价
智能手机 /. 贵金属 /. 元器件 /. 芯片 /. 资源化. 摘要: 为了解智能手机线路板中贵金属资源化价值,采用王水消解-ICP方法、Gompertz模型和卡内基梅隆模型分析其不 The present communication deals with the leaching of gold from the printed circuit boards (PCBs) of waste mobile phones using an effective and less Thiosulfate leaching of gold from waste mobile phones
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Gold leaching from waste mobile phone PCBs in a solution
Gold is one of the most fascinating resources in the waste mobile phones’ printed circuit boards (WMPPCBs). In this study, a new process for recovering Au from Most WMP recycling processes have been developed to recover precious metals (such as gold and silver) from mobile phone printed circuit boards (PCBs), via Recovering materials from waste mobile phones: Recent
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Recycling gold from printed circuit boards gold-plated layer
In the present study, gold was easily recycled from PCBs gold-plated layer of waste mobile phones (WMPs) in DMF-CuCl2 -CaCl 2 (DMF: dimethyl formamide) The results have shown that the Bio-Thio leaching efficiency of gold and concentration of copper in the presence of ammonia have improved significantly and Improvement of gold bioleaching extraction from waste
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Bioleaching of gold and copper from waste mobile phone
Gold and copper can be bioleaching from waste mobile phone PCBs by Chromobacterium violaceum, a cyanogenic bacterium in the YP media at 30 °C. Addition A two-step process with Cu and Au recovery efficiencies of 98% and 44%, respectively was reported in which copper leaching is accomplished with the chemolithotrops Acidithiobacillus ferrovorans and Acidithiobacillus thiooxidans followed by gold leaching using the cyanide-producing Pseudomonas putida under very mild operating conditions Challenges and opportunities in the recovery of gold from electronic
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Metals Free Full-Text Leaching of Gold and
The results of the two-stage leaching process of gold from waste mobile phone PCBs in a separate leaching reactor are also presented in ref. . It was demonstrated that, at the first stage of the Recycling of waste printed circuit boards (PCBs) has attracted increasing attention because of its high annually produced amount and high content of gold. In this study, gold recovery from waste PCBs was carried out by using the processes including microwave pyrolysis, acid leaching, solvent extraction and oxidative precipitation. The Gold recovery from waste printed circuit boards of mobile
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Metals Free Full-Text Optimization of Gold Dissolution
The nature of gold (Au) ore deposits plays an essential role in determining the best gold recovery method as an alternative to cyanidation, considering environmental concerns. Thiourea (Tu) leaching of gold is an alternative lixiviant for treating sulfide gold ores and concentrates. The present study investigated the leaching behavior of Au from Gold leaching using bio-cyanide (Bio-CN) solution has been extensively studied as an economic, simple, and effective alternative method to the traditional cyanidation technology. Thiosulfate leaching of gold from waste mobile phones. J Hazard Mater, 178 (2010), pp. 1115-1119, 10.1016/j.jhazmat.2010.01.099. View PDF View Improvement of gold bioleaching extraction from waste
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Selective recovery of gold from waste mobile phone PCBs by
The degree of metal leaching from PCBs into a 2 molL −1 HCl solution at the temperature of 50 • C in 4 h was 98, 96, 96 and 71% for Zn, Sn, Pb and Cu, respectively. Gold leaching from mobileIn this work, the first step was characterizing the PCB from mobile phones, especially the quantity of precious metals present in these boards, using aqua regia. After that, acid leaching process to extract silver, using nitric acid, was made. Another test was made, using a commercial reagent, that is, cyanide-based to extract gold.Evaluation of gold and silver leaching from printed circuit
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Gold CIP/CIL Processing Plant Solution Dasen Mining
The gold CIP/CIL processing plant is a non-filtering cyanide pulp process that uses activated carbon to directly adsorb and recover gold from cyanide pulp, including seven stages: preparation of leaching pulp, cyanide leaching, activated carbon adsorption, desorption of gold loaded carbon, preparation of gold slime by electric shock, recycling of In the present study, gold was easily recycled from PCBs gold-plated layer of waste mobile phones The gold leaching rate at 200:1 was quite low (43.22%), it increased to 84.24% when the liquid-solid ratio was 300:1, and the gold was almost quantitatively dissolved when the liquid-solid ratio was higher than 500:1.Recycling gold from printed circuit boards gold-plated layer
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Thiosulfate leaching of gold from waste mobile phones
The effect of thiosulfate concentration on the leaching of gold from waste mobile phones was examined by varying its concentration over a range of 0.06–0.2 M.The results presented in Fig. 2 (a)–(d) indicate that the leaching of gold increased with an increase in thiosulfate concentration and then after reaching maximum leaching, Leaching of gold by thiosulfate. Experiments for the leaching of gold from waste mobile phones were carried out using solutions containing 0.06–0.2 M ammonium thiosulfate, 5–30 mM copper sulphate and 0.1–0.4 M ammonia with a contact time of 2 h. Gold dissolution in an ammoniacal thiosulfate solution is known to be an electrochemicalThiosulfate leaching of gold from waste mobile phones
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Recovery of gold from waste electrical and electronic equipment (WEEE
The best conditions for leaching of gold in Na 2 S 2 O 8-KI system were determined to be 0.02 M Na 2 S 2 O 8, 0.15 M KI, 40 ℃, a solid-liquid ratio of 1: 20 (g/mL), and a stirring speed of 200 rpm. Under the optimal leaching parameters, the efficiency of gold leaching from WMPPCBs attained 96% after 120 min. Due to the non-toxic and low This paper evaluated the ability of Pseudomonas fluorescens to leach gold from waste printed circuit boards (WPCBs). Gold was recovered as gold-cyanide complex and cyanide was produced by Pseudomonas fluorescens.In this paper, the effect of pH on gold leaching efficiency was studied, the P.fluorescens was domesticated to grow at Bioleaching of gold from waste printed circuit boards by
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Effect of Acid Leaching Pre-Treatment on Gold Extraction from
The effect of a preliminary acid leaching for the recovery of gold by thiourea from printed circuit boards (PCBs) of spent mobile phones, was investigated. Preliminary leaching is aimed to recover copper in the leachate that would compete with gold in the successive leaching of the residue with thiourea, thus preventing the formation of The well-documented toxicity and environmental concerns around the use of cyanide in the gold mining industry 12 has led to the adoption of the International Cyanide Management Code, a voluntary program intended to reduce the potential exposure of workers and local communities to the harmful effects of cyanide. It is estimated that cyanide leaching is Challenges and opportunities in the recovery of gold from
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A sequential leaching procedure for efficient recovery of gold
The silver and gold leaching rates of the residue after cuprous chloride synthesis (93.8 % silver and 99 % gold) were much higher than those of the raw PCB sample (27.0 % silver and 14.2 % gold) under the same conditions. The leaching of gold from the mobile phone scraps was also found to be good, but it was much slower than Thiosulfate is the most promising non-cyanide leaching reagent and the only reagent which found industrial application on gold recovery from a highly carbonaceous preg-robbing gold ore at BarrickKinetic Investigation and Dissolution Behavior of Cyanide
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Two-step bioleaching of copper and gold from discarded printed circuit
In this study, bioleaching of copper and gold from discarded PCB in a two-step process was studied, in which redoxolysis, acidolysis and complexolysis mechanisms are involved. A number of studies on single-step direct copper ( Bas et al., 2013, Zhu et al., 2011) and gold ( Chi et al., 2011, Natarajan and Ting, 2014) bioleaching have been Gold leaching using thiourea (0.4 M thiourea, pH 1.5, 3 h) following pretreatment using HCl and Citrate and no pretreatment, M. Reprinted with perimission from [66]Thiourea Leaching: An Update on a Sustainable Approach for Gold
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Selective recovery of gold from waste mobile phone PCBs by
The leaching of gold from the scrap mobile phone PCBs by electro-generated chlorine as an oxidant and its recovery by ion exchange process was investigated. The leaching experiments were carried out by employing separate leaching reactor connected with the anode compartment of a Cl 2 gas generator. The leaching of
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