leaching of gold from crushed computer waste with thiourea

  • extracting gold from computer boards beneficiation ore ...

    Leaching of Gold and Silver from Crushed Au-Ag Wastes - CiteSeerX. bInstitute of Mineral and Waste Processing and Dumping Technology, Technical University Clausthal, Walther- ... The thiourea process of gold and silver extraction from ores, concentrates or secondary raw materials con- ... separation; medium value (100 to 400 ppm Au) PC-boards

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  • [PDF] Leaching of Gold and Silver from Crushed Au-Ag ...

    Au-Ag noble metal wastes represent a wide range of waste types and forms with various ballast elements and components. The thiourea process of gold and silver extraction from ores, concentrates or secondary raw materials con- sists of gold and silver leaching into the thiourea solution and the consequent precipitation of these metals from the solu- tion.

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  • Gold cyanidation - Wikipedia

    Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction.

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  • Leaching of Gold and Silver from Crushed Au-Ag Wastes

    The thiourea leaching of gold and silver from electronic waste, goldsmith's waste and ceramic waste using crushing as the pretreatment step was investigated. For electronic waste, it was possible to achieve 97 % gold and 94 % silver recovery within 120 minutes of thiourea leaching.

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  • Study on selectively leaching gold from waste printed ...

    With the shortage of non-ferrous metal resources and ever increasing of electronic wastes,metal recycling from e-waste has been attracting more and more attention for environmental protection and resource utilization.The hydrometallurgical process which has been widely applied in metal recovery from industrial wastes,has been proposed for selectively leaching gold from waste printed circuit ...

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  • Thiourea Gold Leaching - Metallurgist & Mineral Processing ...

    For the thiourea process to compete industrially with cyanidation, it is essential to develop efficient process(es) to recover the gold from solution. Research on the leaching of gold by thiourea has been reported extensively in the literature, but research on the recovery of gold from leach solutions has not been well documented.

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  • Leaching and CIL processes in gold recovery ... - DeepDyve

    May 01, 2007· Read "Leaching and CIL processes in gold recovery from refractory ore with thiourea solutions, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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  • gold leaching with flame - agility-teamwork.ch

    Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex.It is the most commonly used leaching process for gold extraction..

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  • Thiosulfate leaching of gold - A review | Request PDF

    The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options.

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  • leaching gold from printed circuit boards thiourea

    Thiourea leaching gold and silver from the printed . The present communication deals with the leaching of gold and silver from the printed circuit boards (PCBs) of waste mobile phones using an effective and less hazardous system, i.e., a thiourea leaching process as an alternative to the conventional and toxic cyanide leaching of gold.

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  • Is There a Green Chemistry Approach for Leaching Gold?

    cyanide leaching of gold ores is examined in terms of green chemistiy. Also discussed is the potential of cyanide leaching beconling more environmentally friendly. The leaching reagents cyanide, thiocyanate, thiosulfate, and thiourea are compared using some of the principles of …

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  • Gold Recovery Chemicals | E-waste recycling beginners guide

    May 14, 2017· HCl as a gold recovery chemicals: Full name of HCl is hydrochloric acid. It is also known as muriatic acid and historic name spirit of salt because it was made from rock salt. It is a colorless and highly pungent solution of hydrogen chloride in water. It's a large usage in industry. Mostly it's 32 percentage use in industry and e-waste ...

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  • Simple method for extracting gold from electrical and ...

    Simple method for extracting gold from electrical and electronic wastes using hydrometallurgical process Mohammad Aali Dehchenari1, Saeed Hosseinpoor2, Rahim Aali3*, Nilowfar Salighehdar Iran4, Mohsen Mehdipour5 1BSc of Mechanic Engineering,Young Researchers and Elite Club, Majlesi Branch, Islamic Azad University, Isfahan, Iran 2Instructor of Civil Engineering – Structure, Department of ...

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  • Pressure Oxidation of a Refractory Sulfide Concentrate and ...

    Baseline leach experiments have established the refractory nature of the concentrate. Roasting of this concentrate at 450-550°C for one hour prior to leaching has increased gold and silver extraction values to approximately 89% and 70% respectively by thiourea leaching, and 76% and 74% by cyanidation.

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  • Non-cyanide Leaching Processes in Gold Hydrometallurgy and ...

    Gold is one of the most important sources of currency entry in the economics of any state. Besides mining raw materials, fit for effective gold extraction, residues of gold extraction factories are the source of this precious metal. Moreover, the role of industrial wastes, which has a rich source of nonferrous and noble metals, increases.

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  • Screening of Non-cyanide Leaching Reagents for Gold ...

    Jan 30, 2018· Sheng P, Etsell T (2007) Recovery of gold from computer circuit board scrap using aqua regia. Waste Manag Res 25:380 ... Miller D (2007) Reaction kinetics of gold dissolution in acid thiourea solution using ferric sulfate as oxidant. ... Wu J et al (2008) Study on selectively leaching gold from waste printed circuit boards with thiourea. Chin J ...

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  • Reduction of Thiourea Consumption in Gold Extraction by ...

    The thiourea leaching of gold and silver from the gold-bearing silicate ore of the Hishikari mine (Kagoshima, Japan) was studied. The apparent activation energy of the extraction of gold and silver was smaller than that of the reaction rate of thiourea consumption by ferric iron.

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  • Leaching of silver from solid waste using ... - DeepDyve

    Feb 01, 2005· Leaching of silver from solid waste using ultrasound assisted thiourea method Leaching of silver from solid waste using ultrasound assisted thiourea method Öncel, M.Salim; İnce, Mahir; Bayramoǧlu, Mahmut 2005-02-01 00:00:00 Thiourea leaching of precious metals such as gold and silver from ores has several advantages when compared with conventional cyanidation process.

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  • Sustainable technique recovers gold from e-waste cheaply

    Stephen Foley is looking to get his hands on some gold… the problem is that it takes too much time, costs too much money and harms the environment. The work of his research team—made up of ...

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  • The Extraction of Gold from E-waste by Hydrometallurgy ...

    To solve the problems and extract valuable metals by hydrometallurgy, leaching and organic solvent are used. To do this, after a specific amount of electrical and electronic waste was crushed, ground, and refined, it was sampled. Then, the sample was washed with …

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  • 6 The Open Chemical Engineering Journal, Leaching of …

    6 The Open Chemical Engineering Journal, 2008, 2, 6-9 1874-1231/08 2008 Bentham Science Publishers Ltd. Leaching of Gold and Silver from Crushed Au-Ag Wastes Jana Ficeriová*,a, Peter Balá a, Erika Dutkováa and Eberhard Gockb aInstitute of Geotechnics of the SAS, Watsonova 45, 043 53 Ko ice, Slovakia bInstitute of Mineral and Waste Processing and Dumping Technology, Technical …

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  • Thiourea bioleaching for gold recycling from e-waste ...

    Recycling and reuse of electronic wastes (e-wastes) are becoming an increasingly critical strategy for securing metal resources as well as for minimizing environmental impacts. Thiourea leaching of gold (Au) from e-wastes can be considered an alternative to highly toxic cyanidation, provided that its reagents consumption can be largely reduced.

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  • CN103276206A - Method for leaching gold in alkaline ...

    The invention discloses a method for leaching gold in an alkaline thiourea system efficiently and stably. According to the method, under an alkaline condition, thiourea is taken as a gold leaching reagent, sodium hexametaphosphate or trisodium phosphate is taken as a stabilizing agent, calcium peroxide is taken as an oxidizing agent, EDTA (ethylene diamine tetraacetic acid) is taken as a ...

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  • Thiourea for Extraction of Gold & Silver from Silver Ores

    The leaching of gold in thiourea–thiocyanate solutions has been studied by the rotating-disc technique using ferric sulfate as oxidant. ... computer waste is gaining more attention due to its ...

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