New hydrometallurgical route to copper and gold recycling from ewaste. • Twostage leaching process provides bulk separation of base from precious metals. • Individual metals refined using highly selective copper and gold extractants. • Proof of concept for the recycling of valuable metals from endoflife electronics. Abstract
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Biological leaching methods for the treatment of electronic waste can be divided into three types according to the type of biomass exposure to the waste: onestep, twostep, and spentmedium [].In the study of biological leaching of heavy metals from tailings, the operation steps are generally as follows (Figure 2): first, the tailing samples are collected and treated, and physical and ...
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So far, the methods studied for copper leaching from WEEE can be classified as: leaching with strong acids such as HCl (Kim et al., 2011), H 2 SO 4, .This study, which covered a set of leaching processes at a few stages, investigated the inclusion of iron found in mill scale, which is a waste of the ironsteel industry, in the solution as FeCl x=2,3 in the presence of HCl and the conditions ...
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The extraction percentage of copper was obtained using the following equation: (2) ε C u 2 + = C 1 V C 2 m × 100 % where C 1 is the Cu 2+ concentration in the leaching solution (g/L), V is the volume of the leaching solution (L), C 2 is the copper grade in the chalcopyrite concentrate (wt%), and m is the mass of concentrate used in each ...
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Fig. 2a shows the change in the concentrations of metal ions in the solution during the removal of the iron(III) impurity by adjusting the pH value of the leaching can be seen, the concentration of iron(III) ion in the solution became lower and lower with the increase in the pH concentration of iron(III) ions decreased to ppm when the pH value was adjusted to ...
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This study examines the leaching of copper from waste electric cables by chemical leaching and leaching catalysed by Acidithiobacillus ferrooxidans in terms of leaching kinetics and reagents consumption. Operational parameters such as the nature of the oxidant (Fe 3+, O 2), the initial ferric iron concentration (010 g/L) and the temperature (2150 °C) were identified to have an important ...
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See other industries within the Manufacturing sector: Aerospace Product and Parts Manufacturing, Agriculture, Construction, and Mining Machinery Manufacturing, Alumina and Aluminum Production and Processing, Animal Food Manufacturing, Animal Slaughtering and Processing, Apparel Accessories and Other Apparel Manufacturing, Apparel Knitting ...
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Waste printed circuit boards (WPCBs) is the most valuable component in electronic waste, which is accompanied by potential environmental threats due to the presence of hazardous substances. In this study, a gradient enrichment approach including physical preconcentration and leaching deep enrichment was proposed to realize the efficient recovery of copper in WPCBs.
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Modern technologies for recycling electronic waste (ewaste) have high economic efficiency and environmental safety requirements. Among the existing technologies, hydrometallurgy is considered to be the most promising technology for ewaste recycling. Increasing attention paid to the chlorination method is associated with the complex recycling of lowgrade ores containing noble metals and the ...
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The study was performed using electronic waste with high copper contents. The electronic components were manually separated from each of the printed cards (EWPCB), leaving only the substrate with traces of welding (Fig. 1). Once selected, a preliminary milling was performed and the EWPCB was classified by particle size.
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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 ...
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Leaching Copper Gold Electronic waste 1. Introduction In recent years, two simultaneous and contradictory tendencies have occurred worldwide: the first is a renewed interest in environmental protection seeking environmental sustainability, while the second is an exponential increase in the acquisition of electronic devices.
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Bioleaching of copperrich electronic waste material was carried out using mesophillic Acidithiobacillus leaching behaviour of copper was investigated using three methods: abiotic chemical leaching using inorganic sulphuric acid, indirect leaching using bacterially generated sulphuric acid and by direct leaching using the acidophilic bacteria.
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In this work we investigated the influence of planetary ball milling and vertical stirred ball milling on the leaching of a copper ore containing copper sulfate and covellite. We used a mixed experimentalsimulation approach to correlate the kinetic parameters of leaching to the collision energy during grinding.
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A strategy for the efficient recovery of highly pure copper and antimony metals from electronic waste (ewaste) was implemented by the combination of hydrometallurgical and electrochemical processes. The focus is on copper recovery as the main component in the leached solution, whereas the antimony recovery process was established as a purification step in order to achieve a highly pure copper ...
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The collected water is usually recycled in the milling circuit. Copper processing or pyrometallurgical processes employ hightemperature chemical reactions to extract copper from its ores and concentrates. ... increasingly recovered by solution methods including dump and in situ leaching. Because most copper ores are insoluble in water ...
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This study presents the novel idea of a cyanidefree leaching method,, glycineammonia leaching in the presence of permanganate, to treat a lowgrade and copperbearing gold tailing. Ammonia played a key role as a pH modifier, lixiviant and potential catalyst (as cupric ammine) in this study. Replacing ammonia with other pH modifiers (, sodium hydroxide or lime) made the extractions ...
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A conical ball mill (XMQ ϕ150 × 50, Liyuan Metallurgical Equipment Co., Ltd., China) was used in the leaching experiments. 185 g of copper telluride, and certain amounts of NaOH liquor and H 2 O 2 oxidant were mixed and subsequently introduced into the reacting chamber together with stainless steel milling balls (1535 mm in diameter, 12 kg ...
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The leaching efficiencies of Li, Ni, Co, and Mn increased to over % within 120 min in all samples roasted at 600 °C900 °C, but, at the beginning of leaching, the leaching efficiencies ...
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Leaching is a process widely used in extractive metallurgy where ore is treated with chemicals to convert the valuable metals within into soluble salts while the impurity remains insoluble. These can then be washed out and processed to give the pure metal; the materials left over are commonly known as tailings.
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Remove the pins containing gold either by filing or we can directly crush the. Observations: For Experiment. o and ml water. o Solid to Liquid Ratio: 1:5 (for leaching solution) o CuSO may ...
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The recent revolution of technology makes copper find a wide array of applications in electrical, construction, machinery, and defense industries, among others due to its excellent properties of ductility, malleability, and corrosion resistance, among others. However, with the rise in the development of electrical and electronic products, a large quantity of copper and copper compounds have ...
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The wastewater source of 4# tailing pond in Dexing copper mine consists of alkaline flotation pulp and acid mine drainage (AMD) from the nearby opencast mine. Therefore, the heavy metals in tailing ore are very likely to be released due to acidification from AMD. The leaching behaviors of Zn, Cu, Fe and Mn in mine tailings from Dexing copper ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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