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leaching gold from printed circuit boards thiourea

leaching gold from printed circuit boards thiourea

Thiourea leaching gold and silver from the printed circuit ...

2012-06-01  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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Initial Studies about Gold Leaching from Printed Circuit ...

2015-01-01  In thiourea leaching, gold dissolution was studied by varying the concentration of the reagent between 20 g/l to 28 g/l. The results indicate that, under the conditions studied, ammonium thiosulfate is a more effective reagent for the dissolution of gold than thiourea.

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Effect of Acid Leaching Pre-Treatment on Gold Extraction ...

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 gold-thiourea complex. Two hydrometallurgical routes ...

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Leaching of Gold from the Waste Mobile Phone Printed ...

2012-01-02  Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards (PCBs) with Ammonium Thiosulphate Abhishek Tripathi1, ... Thiourea is a non-cyanide lixiviant for gold leaching which efficiently recovers gold. 3. but this is not an economical route for the gold leaching due to its high consumption and cost. Thiosulfate leaching to recover gold from ores is known for several decades

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Current Status on Leaching Precious Metals from Waste ...

2012-01-01  Thiourea leaching gold and silver from waste circuit boards was carried out by Xu, and the influence of leaching time, react temperature, thiourea concentration, Fe 3+ concentration and material particle size on gold leaching rates were investigated.

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Mechanism and Clean Procedure to Extract Gold from Printed ...

(2) Thiourea leaching method has selectivity for extracting gold. Thus the thiourea leaching method is a feasible for extracting gold from the waste printed circuit board.The aim of this work is to analyze the the dissolving mechanism of gold in thiourea solution and thermodynamics of the leaching reactions in order to achieve an environmental way

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

2019-02-01  In the precious metal leaching process, the most common leaching agents used include cyanide, thiourea, thiosulfate, halide and ammonia. Among them, thiourea leaching is known to be most effective in acidic conditions (pH 1–2) using Fe3+ as an oxidant (Hilson and Monhemius, 2006).

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Recycling gold from printed circuit boards gold-plated ...

2021-01-01  Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones Waste Manag. , 32 ( 2012 ) , pp. 1209 - 1212 View Record in Scopus Google Scholar

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Evaluation of gold and silver leaching from printed ...

2014-02-01  Printed circuit boards (PCB) of mobile phones have large amounts of metals with high economic value such as gold and silver. • Dissolution of gold was done with a cyanide-based reagent and silver with nitric acid. • Leaching of PCB with Na 2 S 2 O 3 and (NH 4) 2 S 2 O 3 to examine the feasibility of using these reagents was done.

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Recovery of Precious and Base Metals from Waste Printed ...

2017-12-08  This paper considers the issue of recycling of waste printed circuit boards (WPCBs) containing precious and base metals in appreciable amounts. High-pressure oxidative leaching (HPOL) with dilute sulfuric acid resulted in removal of a significant amount of base metals from a WPCB ash sample obtained by incineration at 800°C. The parameters investigated in the precious metal leaching

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Leaching of Gold from the Waste Mobile Phone Printed ...

2012-01-02  Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards (PCBs) with Ammonium Thiosulphate Abhishek Tripathi1, ... Thiourea is a non-cyanide lixiviant for gold leaching which efficiently recovers gold. 3. but this is not an economical route for the gold leaching due to its high consumption and cost. Thiosulfate leaching to recover gold from ores is known for several decades

Get Price

Mechanism and Clean Procedure to Extract Gold from Printed ...

(2) Thiourea leaching method has selectivity for extracting gold. Thus the thiourea leaching method is a feasible for extracting gold from the waste printed circuit board.The aim of this work is to analyze the the dissolving mechanism of gold in thiourea solution and thermodynamics of the leaching reactions in order to achieve an environmental way

Get Price

Effect of Acid Leaching Pre-Treatment on Gold Extraction ...

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 gold-thiourea complex. Two hydrometallurgical routes ...

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Challenges and opportunities in the recovery of gold from ...

Gold recovery from printed circuit boards ... . 59 A potential drawback in thiourea leaching is that the high abundance of copper in PCBs increases the rate of thiourea decomposition to elemental sulphur, which passivates the gold surface. 60 Even so, it was reported that thiourea could extract up to 90% of the gold from mobile phone PCBs. 61 Au (s) + 2SC(NH 2) 2(aq) + Fe 3+ (aq) → Au{SC(NH ...

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Leaching of Gold from the Waste Mobile Phone Printed ...

2012-01-02  One such e-waste, the mobile phone printed circuit boards (PCBs) contain various precious metals which can be extracted by different hydrometallurgical routes. The present work deals with the recovery of gold using ammonium thiosulfate as a leaching agent from waste mobile PCBs containing 0.021% Au, 0.1% Ag, 56.68% Cu, 1.61% Ca, 1.42% Al, 1.40% Sn, 0.24% Fe, 0.22% Zn,

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gold leaching circuit - iramotors.co

Initial Studies about Gold Leaching from Printed Circuit Boards . Keywords: Recycling, gold, PCB´s, leaching, ammonium thiosulfate, thiourea. * Corresponding author. Tel.: +54-0351-152563804. E-mail address: sebascamelino . Get Price. Gold Extraction Method Replaces Cyanide With Non-Hazardous . Apr 30, 2018 Cyanide has been used in the process of mining gold since 1887. When a A closed-loop ...

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Recovery of Precious and Base Metals from Waste Printed ...

2017-12-08  This paper considers the issue of recycling of waste printed circuit boards (WPCBs) containing precious and base metals in appreciable amounts. High-pressure oxidative leaching (HPOL) with dilute sulfuric acid resulted in removal of a significant amount of base metals from a WPCB ash sample obtained by incineration at 800°C. The parameters investigated in the precious metal leaching

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[PDF] RECOVERY OF GOLD FROM ELECTRONIC WASTE BY IODINE ...

Gold and Silver Selectively Leaching from Printed Circuit Boards Scrap with Acid Thiourea Solution. Wu Juna ; Materials Science; 2009; 8. Save. Alert. Research Feed. Review on Gold Leaching from PCB with Non-cyanide Leach Reagents. Fan Zong-liang; Chemistry; 2009; 6. View 1 excerpt, references background; Save. Alert. Research Feed. J. Li, Experimental study of thiourea leaching gold and ...

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An advanced study on the hydrometallurgical processing of ...

2014-09-18  Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones. Jing-ying L, Xiu-li X, Wen-quan L. Waste Manag, 32(6):1209-1212, 03 Mar 2012 Cited by: 21 articles PMID: 22386109

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Bioleaching of heavy metals from printed circuit board ...

2019-11-30  Printed circuit boards (PCBs) are the core components of electrical and electronic equipment, which generally consist of polymers, ceramics, and heavy metals. The present study has been attempted for removal of heavy metals from printed circuit board by metal-resistant actinobacterium Streptomyces albidoflavus TN10 isolated from the termite nest. This bacterium was

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leaching gold from printed circuit boards thiourea

2019-02-14  leaching gold from printed circuit boards thiourea. GOLD EXTRACTION FROM ELECTRONIC SCRAP. and printed circuit boards were formed pin (16 x 2 x 1 mm) and drawer (20 x 2 x 0.3 mm). Chemical gold from thiourea solutions can be advantageously used for carbon cathode electrolysis, to obtain a leaching gold-plated electro-scrap is a standard chemical method. Ongoing

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Leaching Gold From Printed Circuit Boards Thiourea

Thiourea leaching gold and silver from the printed circuit. 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.

Get Price

Effect of Acid Leaching Pre-Treatment on Gold Extraction ...

2021-01-13  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 gold-thiourea complex. Two hydrometallurgical

Get Price

Mechanism and Clean Procedure to Extract Gold from Printed ...

(2) Thiourea leaching method has selectivity for extracting gold. Thus the thiourea leaching method is a feasible for extracting gold from the waste printed circuit board.The aim of this work is to analyze the the dissolving mechanism of gold in thiourea solution and thermodynamics of the leaching reactions in order to achieve an environmental way

Get Price

Leaching Gold From Printed Circuit Boards Thiourea

54 J. Li X. Xu W. Liu Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones Waste Management 32 2012 1209-1212. 55 H. Madenoglu Recovery of Some Metals from Electronic Scrap. Ege University Graduate School of Natural and Applied Sciences Department of Chemical Engineering Master Thesis 2005.

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leaching gold from printed circuit boards thiourea

2015-12-05  Thiourea leaching gold and silver from the printed circuit ... Jun 01, 2012 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.

Get Price

leaching gold from printed circuit boards thiourea

2021-01-17  leaching gold from printed circuit boards thiourea. Thiourea leaching gold and silver from The present communication deals with the leaching of gold and silver from the printed circuit boards (PCBs) of waste mobile phones usin . INQUIRY; REQUEST A QUOTE; Mobile crushing line. Hot selling equipment. Thiourea leaching gold and silver from . The present communication deals with the leaching

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Leaching of Gold from the Waste Mobile Phone Printed ...

2012-01-02  One such e-waste, the mobile phone printed circuit boards (PCBs) contain various precious metals which can be extracted by different hydrometallurgical routes. The present work deals with the recovery of gold using ammonium thiosulfate as a leaching agent from waste mobile PCBs containing 0.021% Au, 0.1% Ag, 56.68% Cu, 1.61% Ca, 1.42% Al, 1.40% Sn, 0.24% Fe, 0.22% Zn,

Get Price

[PDF] RECOVERY OF GOLD FROM ELECTRONIC WASTE BY IODINE ...

Gold and Silver Selectively Leaching from Printed Circuit Boards Scrap with Acid Thiourea Solution. Wu Juna ; Materials Science; 2009; 8. Save. Alert. Research Feed. Review on Gold Leaching from PCB with Non-cyanide Leach Reagents. Fan Zong-liang; Chemistry; 2009; 6. View 1 excerpt, references background; Save. Alert. Research Feed. J. Li, Experimental study of thiourea leaching gold and ...

Get Price

Recovery of Precious and Base Metals from Waste Printed ...

2017-12-08  This paper considers the issue of recycling of waste printed circuit boards (WPCBs) containing precious and base metals in appreciable amounts. High-pressure oxidative leaching (HPOL) with dilute sulfuric acid resulted in removal of a significant amount of base metals from a WPCB ash sample obtained by incineration at 800°C. The parameters investigated in the precious metal leaching

Get Price

Leaching of Gold from the Waste Mobile Phone Printed ...

2012-01-02  Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards (PCBs) with Ammonium Thiosulphate Abhishek Tripathi1, ... Thiourea is a non-cyanide lixiviant for gold leaching which efficiently recovers gold. 3. but this is not an economical route for the gold leaching due to its high consumption and cost. Thiosulfate leaching to recover gold from ores is known for several decades

Get Price

Study on the influence of various factors in the ...

The present lab-scale experimental study presents the process of leaching waste printed circuit boards (WPCBs) in order to recover gold by thioureation. Preliminary tests have shown that copper adversely affects gold extraction; therefore an oxidative leaching pre-treatment was performed in order to remove base metals. The effects of sulfuric acid concentration, hydrogen peroxide volume and ...

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An advanced study on the hydrometallurgical processing of ...

2020-12-14  This study refers to two chemical leaching systems for the base and precious metals extraction from waste printed circuit boards (WPCBs); sulfuric acid with hydrogen peroxide have been used for the first group of metals, meantime thiourea with the ferric ion in sulfuric acid medium were employed for the second one. The cementation process with zinc, copper and iron metal powders was

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Effect of Acid Leaching Pre-Treatment on Gold Extraction ...

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 gold-thiourea complex. Two hydrometallurgical routes ...

Get Price

Challenges and opportunities in the recovery of gold from ...

Thiourea has also been investigated as a leachant, which, in the presence of iron sulfate, creates the water-soluble cationic gold(i) complex Au[SC(NH 2) 2] 2 + . 59 A potential drawback in thiourea leaching is that the high abundance of copper in PCBs increases the rate of thiourea decomposition to elemental sulphur, which passivates the gold surface. 60 Even so, it was reported that thiourea ...

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Speciation and quantitation of precious metals in model ...

Because of the high cost of platinum, palladium, and gold (> 25 k€/kg), an economic and environmental challenge is their recycling from printed circuit boards that represent around 2% weight of electronic equipment. Hydrometallurgical treatments allow the recovery of these metals in solution, with a high recovery rate for a leaching liquor made of thiourea in hydrochloric acid. So as to ...

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Recovery of Precious Metals from Discarded Mobile Phones ...

The objective of this work was to recover gold and silver from the printed circuit board (PCB) of discarded mobile phones by thiourea leaching. Effects of thiourea concentration, leaching temperature, leaching time, and ferric ion (Fe3+) concentration on the recovery of gold and silver were investigated. The PCB was pretreated physically to reduce the thiourea consumption and enhance

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

2018-01-30  Zhong F et al (2006) Experimental study on leaching gold in printed circuit boards scrap with thiourea. Non-Ferrous Metals Recycl Util 6:25–27 . Google Scholar 28. Wu J et al (2008) Study on selectively leaching gold from waste printed circuit boards with thiourea. Chin J Gold 6:55–58. Google Scholar 29. Gernon M (1996) Preparation of a precious metal salt of a non-oxidizing acid by

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GOLD EXTRACTION FROM ELECTRONIC SCRAP

and printed circuit boards were formed pin (16 x 2 x 1 mm) and drawer (20 x 2 x 0.3 mm). Chemical analysis of samples remelted contacts is given in Table 1 Vyseparované contacts were contaminated with tin solder, possibly remnants of copper wires. Table 1 Chemical composition of the gold-coated contacts after smelting [wt. %] Where: Au - 1 sample for leach ability [wt. %] Au - 2 sample for ...

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A Novel Designed Bioreactor for Recovering Precious Metals ...

2015-08-28  Li, J., Xu, X. Liu, W. Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones. Waste Manage. 6, 1209–121

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