Jing-Ying et al. (2012) investigated the gold and silver recovery of thiourea from printed circuit boards of waste mobile phones . Birloaga et al. (2013) studied the effects of various factors on hydrometallurgical processes in copper and gold recovery from waste circuit boards and obtained a gold recovery of about 70% with thiourea [ 21 ].
Recycling of waste printed circuit boards (PCBs) has attracted increasing attention because of its high annually produced amount and high content of gold. In this study, gold recovery from waste PCBs was carried out by using the processes including microwave pyrolysis, acid leaching, solvent extraction and oxidative precipitation. The …
This review aims to provide an up-to-date evaluation of thiourea-gold leaching studies from electronic waste, with emphasis on the recent progression from …
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. ... Evaluation of gold and silver leaching from printed circuit board of cellphones. Waste Manage., 34 (2014), pp. 475-482, 10.1016/j.wasman.2013.10.032.
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 ...
China Resources Comprehensive Utilization, 2003, (7): 31-35. [32] Wu J, Chen L, Qiu LJ, et al. Study on selectively leaching gold from waste printed circuit boards with thiourea. Gold, 2008, 29(6): 55-58. [33] Xu XL, Li JY. Experimental study of thiourea leaching gold and silver from waste circuit boards.
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 and qualitative considerations on the technical and economic feasibility of the different routes were made. ... This study focuses on leaching of gold from fine-grained waste materials …
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 …
Study on Gold Extraction Process of Printed Circuit Board Based on Thiourea Method. Chao Deng 1,2, Pengzhi Xiang 1,2, ... and the leaching time was 2 h. Under the above conditions, the gold leaching rate reached 90.37 %. The theorem gold extraction method has certain potential application values due to its rapid gold …
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. ... Comparison of Leaching Processes of Gold and Copper from Printed Circuit Boards of Waste Mobile Phone ... Printed Circuit Board (PCB), Thiourea, Waste Mobile ...
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 ...
Keywords: iodine-iodide leaching, gold-iodide complex, gold precipitation, reducing agent, sodium hydroxide, colloidal solutions, waste printed circuit boards 1. Introduction In gold hydrometallurgy, cyanide leaching is a conven-tional approach to recover gold from its ores and concentrates and has been used for over 100 years in gold mines all ...
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 …
Request PDF | Interference of coexisting copper and aluminum on the ammonium thiosulfate leaching of gold from printed circuit boards of waste mobile phones | Ammonium thiosulfate solution is an ...
Gold recovery from waste printed circuit boards of mobile phones by using microwave pyrolysis and hydrometallurgical methods Yu-Fong Huang1, Szu-Ling Chou1 and Shang-Lien Lo1,2* Abstract Recycling of waste printed circuit boards (PCBs) has attracted increasing attention because of its high annually produced amount and high content of …
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+ > …
Still, as an amalgamation of precious and rare raw materials, electronic waste is a considerable economic resource with the most valuable components located on the printed circuit boards. Gold is ...
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 effect of a preliminary acid leaching for the recovery of gold by thiourea from printed circuit boards (PCBs) of spent mobile phones, was investigated. ... of copper was recovered in the leachate and 85% of gold in the thiourea successive leaching. The main operative parameters, namely thiourea and ferric sulphate …
Garlic peel (GP) was chemically modified by using thiourea under hydrothermal treatment, which could selectively adsorb gold ions from the 1/10 dilute aqua regia media directly without needing the dangerous evaporation operation. The synthetic chloroauric solution and practical leach liquor of the waste PCB (printed circuit board) …
In the third stage, residue from acid leaching was further processed for Au recovery using thiourea. The Au recovery of 80% was reported using 20 g/L thiourea, 28.25 g/L ferric sulfate, 10 g/L ...
The rise in the electronics industry has impacted the environment through the large volumes of waste that are improperly disposed of and the growing demand for precious and rare metals from natural sources. Leaching of copper, cobalt, gold, and silver from printed circuit boards of waste cellular phone has been carried out using …
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. ... This review aims to provide an up-to ...
printed circuit boards (Hisshion and Waller, 1984; Li and Miller, 2006; Gonen, 2003; Rizki et al., 2019; Li et al., 2012). ... improve the thiourea leaching of gold from a quartz vein type ore. The
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 ...
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+) …
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 to recover of gold form waste printed circuit …
The present communication deals with the leaching of gold from the printed circuit boards (PCBs) of waste mobile phones using an effective and less hazardous system, i.e., a copper-ammonia ...
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 …
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
