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.

Read More

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. The influence o

Read More

Initial Studies about Gold Leaching from Printed Circuit ...

Jan 01, 2015  Initial Studies about Gold Leaching from Printed Circuit Boards ... 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. The gold ...

Read More

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 thio

Read More

(PDF) Gold Leaching from Printed circuit Board Scrap with ...

Aug 07, 2018  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 ...

Read More

Initial Studies about Gold Leaching from Printed Circuit ...

Initial studies about gold leaching from printed circuit boards (PCB’s) of waste cell phones ... Dissolution with thiourea Gold dissolution employing thiourea acid solutions with ferric ions as ...

Read More

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

Jan 01, 2016  The recoveries of gold from printed circuit board are carried out in this work. Chemical analysis of waste printed circuit board was determined by ICP (Inductively Coupled Plasma) method. The dissolving mechanism of gold was elaborate. ... The stability of leaching process of gold in thiourea solution was investigated, the optimal experimental ...

Read More

(PDF) Leaching of gold, silver and accompanying metals ...

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 ...

Read More

(PDF) Gold Leaching from Printed circuit Board Scrap with ...

Aug 07, 2018  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 ...

Read More

Initial Studies about Gold Leaching from Printed Circuit ...

Initial studies about gold leaching from printed circuit boards (PCB’s) of waste cell phones ... Dissolution with thiourea Gold dissolution employing thiourea acid solutions with ferric ions as ...

Read More

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

Jan 13, 2021  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 ...

Read More

(PDF) Current Status on Leaching Precious Metals 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. ... was recovered in the leachate and 85 ...

Read More

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

Jan 13, 2021  of thiourea that was expected to form the complex gold-thiourea that is the necessary step to achieve the dissolution of the precious metal [10,19]. Birloaga et al. [20] reports the leaching of spent computer-printed circuit boards, which are different from the boards of spent mobile phones that are the material used in this paper.

Read More

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.

Read More

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

Experimental study of thiourea leaching gold and silver from waste printed circuit boards. Journal of Qingdao University (ET), 2011, 26:69-73. The effects of the temperature and of the liquid/solid ratio have been not considered in this paper whereas they have been tested in our paper.

Read More

An advanced study on the hydrometallurgical processing of ...

Dec 14, 2020  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.

Read More

Current Status on Leaching Precious Metals from Waste ...

Thiourea leaching gold and silver from waste circuit boards was carried out by Xu [33], and the influence of leaching time, react temperature, thiourea concentration, Fe3+ concentration and material particle size on gold leaching rates were investigated. The results showed that, gold and silver leaching

Read More

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

Chen, et al., Gold and silver selectively leaching from printed circuit boards scrap with acid thiourea solution, Nonferrous Metals, 61, 2009 Experimental study on leaching gold in printed circuit boards ’ scrap with thiourea , Non - Ferrous Metals Recycling and Utilization , 6 ,

Read More

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

Read More

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

Read More

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

Jan 27, 2020  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 ...

Read More

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 feedback for dissolving in

Read More

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

Read More

(PDF) Current Status on Leaching Precious Metals 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. ... was recovered in the leachate and 85 ...

Read More

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

Read More

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.

Read More

An advanced study on the hydrometallurgical processing of ...

Dec 14, 2020  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.

Read More

Hydrometallurgical Recovery of Metals from Large Printed ...

Sep 29, 2015  The recovery of precious metals from waste printed circuit boards (PCBs) is an effective recycling process. ... Orgul, S. Reaction chemistry of gold leaching in thiourea solution for a Turkish ...

Read More

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

Jan 02, 2012  : Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards (PCBs) with Ammonium Thiosulphate Literature reveals that only limited studies have been carried out to recover the metals from waste mobile phonePCBs. Ammonium thiosulfate [(NH 4) 2 S 2 O 3] is a leachant which is non-toxic as well as economical. It works to stabilize gold as

Read More

Current Status on Leaching Precious Metals from Waste ...

Thiourea leaching gold and silver from waste circuit boards was carried out by Xu [33], and the influence of leaching time, react temperature, thiourea concentration, Fe3+ concentration and material particle size on gold leaching rates were investigated. The results showed that, gold and silver leaching

Read More

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

Jan 02, 2012  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% ...

Read More

Hydrometallurgical Treatment of Waste Printed Circuit ...

Apr 02, 2020  concentrations on leaching gold and silver from shredded waste printed circuit boards, given that bromine is not only the source of bromide ions, but also acts as an oxidant, o ff ering a high ...

Read More

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 feedback for dissolving in

Read More

IOP Conference Series: Materials Science and Engineering ...

Ying L and Zhong F dealed with the leaching of gold and silver from the printed circuit boards of waste mobile phones using a thiourea leaching process [3-4].Thiosulphate gold leaching has received considerable attention as an alternative technology to the cyanidation of gold

Read More

A critical review on the recycling of copper and precious ...

Oct 23, 2017  Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones. Waste Management, 2012, 32(6): 1209–1212 CAS Article Google Scholar

Read More

US4778519A - Recovery of precious metals from a thiourea ...

A method is provided for recovering gold and silver from precious metal bearing materials including ores, leaching residues, flue dust, electronic scrap, jewelry scrap, etc. In the method, the gold and silver are extracted from the precious metal bearing materials with a thiourea solution to form a thiourea leach, and the thiourea leach is contacted with carbon to adsorb the gold and silver ...

Read More