In the gold leaching experiments, a certain amount of gold or PCB sample was placed in the DMF-CuCl 2-CaCl 2 system on a shaking apparatus at a given temperature. After a specific amount of time, the sample was removed. The detailed parameters and the gold leaching rate are listed as Table 3 for pure gold leaching, and Table 4 for PCBs
Printed circuit board (PCB) is the essential part of electronic devices and has an important source of base and precious metals with high economic potential. ... Gold leaching in iodine-iodide ...
This will be a good learning experience for you. Irons, I am a bit stranded. You were talking about 7gr/liter of iodine crystals in water+NaOH I've noticed patents talking about mixing 4 parts of potassium iodide with 1 part iodine crystal. Question: Is the 7gr/liter equal to 4 parts of KI...
Eco-Goldex O-series ; The O Series (it refers to Ores) is specially formulated and manufactured with the purpose of replacing the toxic sodium cyanide in gold/silver/PGM rock ore leaching. The O series can compete sodium cyanide easily in most rock ore processing including gold leaching rate (similar or even better), agent consumption (similar or slightly higher) and leaching time (similar or ...
Iodine leaching is advantageous owing to faster leaching, gold selectivity, less leaching of base metal, easy to regenerate iodine, no corrosion, and no toxicity (Zhang et al. 2012). Sodium thiosulfate and ammonium thiosulfate are commonly used for the extraction of gold from e-waste.
Xu Q, Chen D H, Chen L, Huang M H. Gold leaching from waste printed circuit board by iodine process. Nonferrous Metals, 2010, 62 (3): 88–90 (in Chinese) CAS Google Scholar 47. Baghalha M. Leaching of an oxide gold ore with chloride/hypochlorite solutions. International Journal of Mineral Processing, 2007, 82(4): 178–186
Iodine leaching process for recovery of gold from waste PCB [J] Chinese Journal of Environmental Engineering, 3 (5) (2009), pp. 911-914 (in Chinese) View Record in Scopus Google Scholar. 36. Qu XU, Dong-hui CHEN, Liang CHEN, Man-hong HUANG. Electrodepositing gold of iodine leaching solution from waste printed circuit board [J] The Chinese ...
Iodine leach for the dissolution of gold . United States Patent 4557759 . Abstract: A process for the hydrometallurgical recovery of gold from materials containing gold comprising leaching the materials with a lixiviant containing iodine. To a solution concentrated with natural salts is added elemental iodine until saturated, whereupon mineral ...
The metals extraction from leaching PCB powder in solutions containing 30 g/L glycine at pH 11.0 and room temperature (23 ± 2 °C) has been studied. Metals extraction from leaching the PCB powder in glycine solutions for 24 h is shown in Table 5. After 24 h, the results show that glycine selectively dissolves base metals and aluminium (Al ...
： The technical process of electrodepositing gold of iodine leaching solution from waste printed circuit board (PCB) was investigated. The results show that ...
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.
A process for the hydrometallurgical recovery of gold from materials containing gold comprising leaching the materials with a lixiviant containing iodine. To a solution concentrated with natural salts is added elemental iodine until saturated, whereupon mineral sulfides in the ore zone charged with this solution react with the iodine to form iodide.
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 time of 24 hours (O'Malley, 2002 O'Malley, G. P.; Recovery of Gold from Thiosulfate ...
Highlights Two gold ores were subjected to iodide/iodine leaching. The carbonaceous ore showed only 20% gold extraction. Gold extraction from the oxide ore reached 89% in 24 h. A power law rate equation was applied to model the gold extraction kinetics. Gold leaching rate was first order with respect to tri-iodide concentration.
The design of technical process for recovery of gold from waste printed circuit board(PCB) by iodine leaching process was investigated.The influences of iodine concentration,the ratio of n(I 2) to n(I-),H 2O 2 concentration,the ratio of solid to liquid,leaching time,pH,leaching temperature were studied.Through orthogonal experiment,the most optimized qualifications of iodine leaching gold …
Apart from thiourea, aqueous-based iodine solution, noncyanide compound, is also tested for its capability and found suitable for leaching precious metal from PCB. However, factors such as cost and quantity of the iodine solution being used make the process economically less viable for use.
Iodine Gold Leaching. Over the last few years there has been an intense effort to identify lixiviants other than cyanide for gold and silver leaching. Bromide and iodide also exhibit the ability to form polyhalide complexes. This characteristic promotes the …
Gold leach based on the Iodine/Potassium Iodide etch. Solution buffered at pH 9 with carbonate/ bicarbonate. Three ways of precipitating tried - SMB, Electro...
Gold extraction by iodine-iodide solution is an effective and environment-friendly method. In this study, the method using iodine-iodide for gold leaching is proved feasible through thermodynamic calculation. At the same time, experiments on flotation gold concentrates were carried out and encouraging results were obtained. Through optimizing the technological conditions, the …
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(formula) [33,34] and iodine [35,36] were investigated for their effectiveness to recover valuable metals from waste PCB. Sulphuric Acid leaching, often in combination with an oxidant is the most common method to extract base metals from their primary and secondary sources [37], including discarded PCB. Sulphuric acid is a
Complete PCB leaching (whole unit) of the mobile phone was also done to observe its effect on the leaching of gold. Results are compared with the shredded PCBs granules as shown in Fig. 7. About 78.8% of gold was leached with a complete PCB while in case of shredded sample it was 30.35% with the same pulp density (40 g/L) and other leaching ...
The technical process of electrodepositing gold of iodine leaching solution from waste printed circuit board (PCB) was investigated. The results show that the most optimized conditions of ...
PCB leaching using sodium thiosulfate and ammonium thiosulfate. Table 7, Table 8, Table 9 show that aqua regia, cyanide and nitric acid are efficient leaching agent for metals present in PCB's. However, these leaching agents have great disadvantages such as high cost, high toxicity to the environmental and workers.
Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to …
The design of technical process for recovery of gold from waste printed circuit board(PCB) by iodine leaching process was investigated.The influences of iodine concentration,the ratio of n(I 2) to n(I-),H 2O 2 concentration,the ratio of solid to liquid,leaching time,pH,leaching temperature were studied.Through orthogonal experiment,the most optimized qualifications of iodine leaching gold from ...
Printed circuit board (PCB) is the essential part of electronic devices and has an important source of base and precious metals with high economic potential. ... Gold leaching in iodine-iodide ...
Xu Qu, Chen Donghui, Chen Liang,et al .Gold leaching from waste printed circuit board by iodine process[J].Nonferrous Metals,2010,62（3）：88-90. 2: Angelidis T N, Kydros K A, Matis K A .A fundamental rotating disk study of gold dissolution in iodine-iodide solutions [J].Hydrometallurgy,1993,34（1）：49-64. 3
Flotation as a separation technique in the coal gold agglomeration process. Minerals Engineering, 2000, 13: 255-264. [42] Zhang XY, Chen L, Fang ZT. Review on gold leaching from PCB with non-cyanide leach reagents. Nonferrous Metals, 2009, 61: 72-76. [43] Xu Q, Chen DH, Chen L, et al. Gold leaching from waste printed circuit board by iodine ...
Bahl SK, Leach GL (1980) Gold etchant composition and method. US Patent 4,190,489, 26 Feb 1980. 55. Nguyen NV, Jeong J, Shin D, Kim BS, Lee JC, Pandey BD (2012) Simultaneous recovery of gold and iodine from the rinse water of the semiconductor industry using activated carbon. Mater Trans 53:760–765. Article Google Scholar 56.
