leaching gold from printed circuit boards thiourea

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Gold Leaching from Printed Circuit Boards of Discarded ...

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 ...

Recovery of Precious Metals from Discarded Mobile Phones ...

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 ie a thiourea leaching process as an alternative to the conventional and toxic cyanide leaching of gold The influence of particle size thiourea and Fe 3 concentrations and temperature on the leaching of gold

leaching gold from printed circuit boards thiourea

Gold leaching from printed circuit boards(PCB) of discarded cell phones was carried out via the process of nitric acid oxidation-acidic thiourea leaching,with the influences of particle size,mass fraction of ferric sulfate,pH value,thiourea concentration and reaction temperature on the leaching process investigated.The results show that the smaller the particle size,the higher the rate of gold ...

Gold Leaching from Printed Circuit Boards of Discarded ...

From a literature review (leaching of gold ores, mostly), it was found that there are two research lines. Some authors worked with lower concentrations of thiosulfate and ammonium for a leaching time of 4 hours, whereas others worked with higher concentrations of thiosulfate and ammonium and a leaching …

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 Gold From Printed Circuit Boards Thiourea

Jun 01 2012 · Thiourea is a selective and less hazardous agent as an alternative to the conventional and toxic cyanide The agent was applied to leach gold and silver from PCBs of waste mobile phones The influence of the particle size thiourea and Fe 3 concentrations and temperature was investigated In the best condition about 90 of gold …

GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF …

Thiourea leaching gold and silver from the printed circuit . The rapid growth in the use of electronic equipments combined with early obsolescence has contributed enormously to the generation of large quantity of electronic e waste One such e-waste the mobile phone printed circuit boards PCBs contain various precious metals which can be extracted by different hydrometallurgical routes The ...

(PDF) Current Status on Leaching Precious Metals from ...

Jan 01, 2015· Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards (PCBs) with Ammonium Thiosulphate. International Journal of Metallurgical Engineering. Varanasi, India, pp. 17-21. Örgül S., Atalay Ãœ., 2002. Reaction chemistry of gold leaching in thiourea solution for a Turkish gold ore. Hydrometallurgy Vol. 67, Elsevier.

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

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

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 …

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

According to Wu et al, in general, a printed circuit board from mobile phones has a composition of polymers (30 to 35%), oxides (30%), and metals ( 30 to 40%). According to Huissman et al (2007), …

Comparison of Leaching Processes of Gold and Copper from ...

Thiourea leaching gold and silver from the printed circuit . The rapid growth in the use of electronic equipments combined with early obsolescence has contributed enormously to the generation of large quantity of electronic e waste One such e-waste the mobile phone printed circuit boards …

Electrostatic Separation for Recovering Metals and ...

The recovery rate of copper was found to be 96.42%, and 94.3% of the gold was leached in the former process. Similar trends were obtained for the leaching of copper and gold in the latter process, but it was lower that about 95.27% of copper was recycled, while 93.4% of gold …

Initial Studies about Gold Leaching from Printed Circuit ...

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

leaching gold from printed circuit boards thiourea in togo

When thiourea and PCB (Printed Circuit Boards) co-exist, Acidiplasma sp. Fv-Ap displayed the most robust Fe-oxidation. The Eh level during the reaction was first optimized by fluctuating the initial ratio of thiourea to Fe3+ (TU:Fe3+ = 2:1–40:1, by using 1 mM Fe3+ vs. 2–40 mM thiourea).

GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF MOBILE …

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 ...

Use of Thiourea Leaching During Gold-Containing Dump ...

Aug 31, 2016· Gold is often found on printed circuit boards, particularly under keyboards where its durability is an advantage. According to the UE researchers, about 300 tonnes of the metal are used in ...

Current Status on Leaching Precious Metals from Waste ...

From a literature review (leaching of gold ores, mostly), it was found that there are two research lines. Some authors worked with lower concentrations of thiosulfate and ammonium for a leaching time of 4 hours, whereas others worked with higher concentrations of thiosulfate and ammonium and a leaching …

thiourea circuits for sale

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 ...

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

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

Current Status on Leaching Precious Metals from Waste ...

Current research on leaching precious metals from waste printed circuit boards (PCBs) in the world is introduced. In the paper, hydrometallurgical processing techniques including cyanide leaching ...

Thiourea bioleaching for gold recycling from e-waste —

The traditional gold leaching method is cyanidation, which carries serious security and environmental problems. More and more attention is paid to the research on non-cyanide process. A high-arsenic-and-sulphur refractory gold …

A better way to mine gold from old electronics

(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 …

Leaching Gold From Printed Circuit Boards Thiourea

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 …

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

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 ...