WhatsApp)
Based on the contents of metals analyzed by Inductively Coupled Plasma Optical Emission Spectrometer (ICPOES), containing copper and precious metals such as gold, the paper compared the extraction processes of gold, copper from waste mobile phone printed circuit board (PCB). In this study, two processes, nitric acid and thiourea (NT), sulfuric acidhydrogen peroxide and iodine (SPI) were
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
Thiourea leaching Thiourea was first synthesized in 1868, also known as sulfurized urea. It is an organic complexing agent with reducibility, being able to form white crystal of complexes with many metal ions. Under acidic conditions, with the presence of oxidant (usually Fe3+), thiourea and gold will form soluble cationic complexes. Comparing with other leaching reagent, thiourea shows much poorer stability.
It is found that the sample of the dumps contains sorptionactive minerals, which lead to the loss of gold with tails. Therefore, it is suggested that raw material should undergo a preliminary acid treatment to reduce the consumption of thiourea and sodium sulfite should be added to
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,, a thiourea
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,, 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 and silver
and toxic cyanide can deal with the leaching of gold from the printed circuit boards (PCBs) of waste mobile phones. Thiosulfate method can effectively extract gold from discarded printed circuit
Dec 01, 2011#0183;#32;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,, a thiourea
Sodium thiosulfate (Na 2 S 2 O 3) and ammonium thiosulfate ( (NH4) 2 S 2 O 3) were evaluated as to PCB leachers. Different concentrations of ammonium hydroxide (NH 4 OH), copper (II) sulfate (CuSO 4) and hydrogen peroxide (H 2 O 2) were added in the leaching tests with thiosulfate.
X. Li Jingying and W. Liu, Thiourea leaching gold and silver from the printed circuit boards of waste mobile phones, Waste Management,32, No. 6, (2012). Article Google Scholar
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 (Fe 3+) concentration on the recovery of gold and silver were investigated. The PCB was pretreated physically to reduce the thiourea consumption and enhance the leaching process.
One such ewaste, the mobile phone, the 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 thiosuphate as a leaching agent from waste mobile PCBs containing % Au, % Ag, % copper, % Ca, % Al, % Sn, % Fe, % Zn, % Pd etc..
Abstract. 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
Mar 26, 2015#0183;#32;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,, a
Gold Leaching From Printed Circuit Boards Of Discarded. Gold leaching from printed circuit boardsPCB of discarded cell phones was carried out via the process of nitric acid oxidationacidic thiourea leaching,with the influences of particle size,mass fraction of ferric sulfate,pH value,thiourea concentration and reaction. Leaching Of Gold And Silver From Printed Circuit Board
Jan 01, 2015#0183;#32;The treatment of these boards is desirable from an economic and environmental perspective. In this paper we inform the results achieved on laboratory leaching of gold contained in PCB''s from cell phones. The reagents used were ammonium thiosulfate in basic medium and thiourea in sulfuric acid solution.
leaching gold from printed circuit boards thiourea. Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards (PCBs) with Ammonium Thiosulphate Abhishek Tripathi1, Thiourea is a noncyanide 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.
Jun 01, 2012#0183;#32;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
Jan 01, 2016#0183;#32;Thus the thiourea leaching method is a feasible for extracting gold from the waste printed circuit 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 to recover of gold form waste printed circuit board. 2 Experimental
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
The present labscale 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
WhatsApp)