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Leaching Gold From Printed Circuit Boards Thiourea

Thiourea leaching gold and silver from the printed

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. The influence o

Thiourea leaching gold and silver from the printed

Thiourea Leaching Gold And Silver From The Printed

Jun 01, 2012 Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones 1. Introduction. Mobile phones are essential tools for telecommunication and are also regarded as fashion icons to... 2. Materials and methods. Since thiourea is not stable and easy to decompose in alkaline ...

Initial Studies about Gold Leaching from Printed

Initial Studies About Gold Leaching From Printed

Jan 01, 2015 The conditions studied in the leaching test were thiosulfate molar concentration between 0.08 M and 0.12 M and ammonium hydroxide from 0.1 M to 0.2 M, temperature of 20 C, pH 10.5 and 15 mM of cupric ion. 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

Thiourea leaching gold and silver from the printed circuit

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 of particle size, thiourea and Fe concentrations and temperature on the

Effect of Acid Leaching PreTreatment on Gold

Effect Of Acid Leaching Pretreatment On Gold

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.

Thiourea leaching gold and silver from the printed

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. The influence of particle size, thiourea and Fe 3 concentrations and temperature on

Thiourea bioleaching for gold recycling from ewaste

Thiourea Bioleaching For Gold Recycling From Ewaste

Feb 01, 2019 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. While awareness of the use of biohydrometallurgical techniques in metal mining industries is increasing, the knowledge on microbiological precious metal solubilization is still limited.

Current Status on Leaching Precious Metals from

Current Status On Leaching Precious Metals From

Jan 01, 2012 Results of the experiment of leaching gold from waste PCBs with thiourea by Zhong 35 showed that suitable leaching conditions are as follows solid-liquid 15, leaching temperature 35 , thiourea concentration 10 g/L, Fe 3 concentration 0.3%, H 2 SO 4 concentration 5%, leaching period 1h.

thiourea gold leaching process

Thiourea Gold Leaching Process

Sep 10, 2018 The use of thiourea as an alternative lixiviant to gold cyanidation for processing gold-bearing ores or concentrates was first developed by Soviet metallurgists in the 1940s. However, the interest for thiourea leaching of gold mainly came during the 1980s and 1990s to establish a parallel process.

Study on the influence of various factors in the

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

PDF Gold Leaching from Printed circuit Board Scrap with

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 ...

Effect of Acid Leaching PreTreatment on Gold Extraction

Effect Of Acid Leaching Pretreatment 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 ...

PDF Leaching of gold silver and accompanying metals

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

Effect of Acid Leaching PreTreatment on Gold Extraction

Effect Of Acid Leaching Pretreatment 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 gold

Use of Thiourea Leaching During GoldContaining Dump

Use Of Thiourea Leaching During Goldcontaining Dump

Nov 06, 2019 X. Li Jing-ying and W. Liu, Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones, Waste Management,32, No. 6, 12091212 (2012). Article Google Scholar

An advanced study on the hydrometallurgical processing of

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.

Mechanism and Clean Procedure to Extract Gold from

Mechanism And Clean Procedure To Extract Gold From

(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

Study on the influence of various factors in the

Study On The Influence Of Various Factors In The

Apr 01, 2013 No gold dissolution was observed by performing leaching tests with thiourea and ferric ion in the same experimental conditions on 10 g of waste printed circuit boards (A sample) at a particle size 3 mm without a preliminary oxidative leaching process. It may be possible that Cu has the effect to passivate the surface.

Hydrometallurgical Recovery of Metals from Large Printed

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

US4778519A Recovery of precious metals from a thiourea

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

Current Status on Leaching Precious Metals from Waste

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 leaching, thiosulfate leaching, and halide leaching of precious metals are addressed in detail. In order to develop an environmentally

THIOUREA LEACHING OF PRECIOUS METALS Mechanism of

Thiourea Leaching Of Precious Metals Mechanism Of

Thiourea leaching of Au and Ag from spent printed circuit boards was carried out by Xu and Li (2011), and the influence of leaching time, reaction temperature, thiourea concentration, Fe concentration, and material particle size on Au leaching rates were investigated. The results showed that Au and Ag leaching rates can reach 90.9% and 59.8% ...

Study on Gold Extraction Process of Printed Circuit Board

Study On Gold Extraction Process Of Printed Circuit Board

Jun 01, 2020 PDF On Jun 1, 2020, Chao Deng and others published Study on Gold Extraction Process of Printed Circuit Board Based on Thiourea Method Find, read and cite all the research you need on ResearchGate

Technology of Gold Extraction from Mature Dumps by

Technology Of Gold Extraction From Mature Dumps By

Jul 06, 2020 The conditions of performing thiourea leaching were selected based on a review of literature sources related to this area. It was noted in 14, 611, 1319, 23 that Thio is an expensive reagent, so all studies are focused on the use of thiourea leaching for rich raw material with gold content 1015 g/t. It was established that, for ...

Effect of Acid Leaching PreTreatment on Gold Extraction

Effect Of Acid Leaching Pretreatment On Gold Extraction

Jan 13, 2021 Experimental study of thiourea leaching gold and silver from waste printed circuit boards. Journal of Qingdao University (ET), 2011, 2669-73. 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.

A critical review on the recycling of copper and precious

A Critical Review On The Recycling Of Copper And Precious

Oct 23, 2017 Li J Y, Xu X L, Liu WQ. Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones. Waste Management, 2012, 32(6) 12091212. CAS Article Google Scholar 17. Cui J, Zhang L. Metallurgical recovery of metals from electronic waste A

An Alkaline GlycineBased Leach Process of Base and

An Alkaline Glycinebased Leach Process Of Base And

Aug 09, 2019 An alkaline glycine leaching system has been evaluated to extract and remove base and precious metals derived from waste printed circuit boards. This leach system has the benefit over other alkaline systems such as pure cyanide-based or ammonia based leach systems in that it is safer and environmentally friendlier, with no volatile reagents and ...

Comparison of Leaching Processes of Gold and Copper

Comparison Of Leaching Processes Of Gold And Copper

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 were leached. Both the two processes were nontoxic and non-cyanide system.

Process development for recovery of copper and precious

Process Development For Recovery Of Copper And Precious

Aug 05, 2013 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, (6)1209-1212 2012

An advanced study on the hydrometallurgical processing of

An Advanced Study On The Hydrometallurgical Processing Of

Sep 18, 2014 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

Challenges and opportunities in the recovery of gold from

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 AuSC(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 ...

Study on Gold Extraction Process of Printed Circuit Board

Study On Gold Extraction Process Of Printed Circuit Board

The printed circuit board is rich in recyclable metals Cu, Au, Ag, Pt, Pb, etc. The precious metals such as gold are extracted from it, which is in line with the concept of resource recycling. In this paper, the theorem method was used to extract gold from waste circuit boards. The effects of reaction time, reaction temperature, theorem concentration, and Fe3 mass

Hydrometallurgical Recovery of Metals from Large Printed

Hydrometallurgical Recovery Of Metals From Large Printed

Sep 29, 2015 Orgul S. Reaction chemistry of gold leaching in thiourea solution for a Turkish gold ore. Hydrometallurgy 67, 7177 (2002). Google Scholar Zhu P. et al. A new technology for separation and recovery of materials from waste printed circuit boards by dissolving bromine epoxy resins using ionic liquid. J. Hazard. Mater. 239, 270278 (2012).

Leaching of gold and silver from printed circuit board of

Leaching Of Gold And Silver From Printed Circuit Board Of

Leaching of gold and silver from printed circuit board of mobile phones ... NCEL, M. S., In NCE M., BAYRAMOGLU, M. Leaching of silver from solid waste using ultrasound assisted thiourea method. Ultrasonics Sonochemistry v.12, p.237-242, 2005.). ... The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium ...

Study on the Gold Leaching Process by Potassium

Study On The Gold Leaching Process By Potassium

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 concentrate in Sichuan was taken as the object of study. After the roasting-oxidation pretreatment of the sample, potassium ferricyanide was