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Wang H X, Sun C B, Li S Y, Fu P F, Song Y G, Li L, Xie W Q. Study on gold concentrate leaching by iodineiodide. International Journal of Minerals Metallurgy and Materials, 2013, 20(4): 323–328. Article Google Scholar Xu Q, Chen D H, Chen L, Huang
Leaching of gold by the iodineiodide system can be carried out in a wide pH range between 2 and 10 31, in contrast to cyanide leaching, which is normally carried
In this study, selective leaching of gold from PCB was performed in an iodinehydrogen peroxide (I 2H 2 O 2) solution system. The effects of different
A novel process for gold leaching from waste mobile phones (WMPs) was proposed. • In iodide solution, Na 2 S 2 O 8 is an ecofriendly oxidant for gold leaching
Gold extraction by iodineiodide solution is an effective and environmentfriendly method. In this study, the method using iodineiodide for gold leaching is proved
After electrolytic experiment, the anode iodine solution can be recycled for electrolyte or leaching gold from waste PCB. Key words: electrodeposit; waste printed circuit board;
Abstract. Gold leaching in iodineiodide solution has been intensely researched in 1980s; while due to the high cost, it has not been applied in industry.
The most widelyresearched noncyanide lixiviant systems for the gold recovery such as thiourea,thiosulphate,thiocyanate etc.are reviewed according to the gold leaching
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
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
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
[7] Aylmore M. and Muir D. 2001 Thiosulfate leaching of gold a review Minerals Engineering 14 135174. Google Scholar [8] Camelino S., Rao J., Padilla R.L. and Lucci R. Initial studies about gold leaching from printed circuit boards (PCB's) of waste cell phones Procedia Materials Science 9 105112. Google Scholar
A reaction controlled system was determined for goldiodine leaching. The activation energy was found to be 35.57 kJ/mol, which fits in the range of calculations from other researchers 51,52.
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
Iodine gold leaching can be a promising alternative to cyanide leaching because of its low volatility and hazardousness . The process presents high leaching rates and the formed gold iodide complexes are more stable in aqueous solutions than the complexes with other halogens [ 20 ].
Kinetical calculations were conducted to determine the dissolution model and activation energy of the gold leaching with iodine. After comparing different models, it was found that the shrinking core model for a cylindrical geometry suits to the experimental data (Fig. 9) 49, 50. A reaction controlled system was determined for goldiodine leaching.
The welldocumented toxicity and environmental concerns around the use of cyanide in the gold mining industry 12 has led to the adoption of the International Cyanide Management Code, a voluntary program intended
promotes the dissolution of gold according to the reaction listed in Table 10. Table 10. Chemical reactions in gold leaching (P25/R105) Reaction Stoichiometry Yield Reaction Heat Au + 4HCl(aq
the gold leaching is their powerful oxidizing ability, leading to a high dissolution rate compared to alkaline cyanide leaching. Iodine/iodide has been reported as an alternative to cyanidation with air as the oxidant. The stable golddiiodo and tetraiodo complexes are stable up to pH 14 [26]. Xu et al. reported that the gold
Study on gold concentrate leaching by iodine iodide. Apr 19, 2013 Gold extraction by iodineiodide solution is an effective and environmentfriendly method. In this study, the method using iodineiodide for gold leaching is proved feasible through thermodynamic calculation.
Keywords: iodineiodide leaching, goldiodide complex, gold precipitation, reducing agent, sodium hydroxide, colloidal solutions, waste printed circuit boards 1. Introduction In gold hydrometallurgy, cyanide leaching is a conventional approach to recover gold from its ores and concentrates and has been used for over 100 years in gold mines all
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(I2) to n(I), H2O2 concentration, the ratio of solid to liquid, leaching time, pH, leaching temperature were studied. Through orthogonal experiment,
ABSTRACT. Gold leaching in iodineiodide solution has been intensely researched in 1980s; while due to the high cost, it has not been applied in industry. Currently, as the drawbacks of other hydrometallurgies appearing such as aqua regia and cyanidation, mining and exploration companies are shifting their attention to the iodide
Iodine leaching of gold is a kind of halogen gold extraction method. The stability of the gold iodine complex formed by leaching of the gold reaction ranks only second to the gold cyanide complex [1], and the ligand in the leaching of the gold system remains stable in the range of 0–14 [2].
ABSTRACT Gold leaching in iodineiodide solution has been intensely researched in 1980s; while due to the high cost, it has not been applied in industry. (PCB) is the essential part of electronic devices and has an important source of base and precious metals with high economic potential.
A reaction controlled system was determined for goldiodine leaching. The activation energy was found to be 35.57 kJ/mol, which fits in the range of calculations from other researchers 51,52.
Iodine gold leaching can be a promising alternative to cyanide leaching because of its low volatility and hazardousness . The process presents high leaching rates and the formed gold iodide complexes are more stable in aqueous solutions than the complexes with other halogens [ 20 ].
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
Gold bioleaching mediated by iodide oxidizing bacteria (IOB) has been proposed as a sustainable alternative to conventional technologies such as cyanidation. (45 ppm gold) using onestep, twostep and spent medium leaching at 1% pulp density over 10 days. Twostep bioleaching of ore concentrate resulted in the highest gold leaching
promotes the dissolution of gold according to the reaction listed in Table 10. Table 10. Chemical reactions in gold leaching (P25/R105) Reaction Stoichiometry Yield Reaction Heat Au + 4HCl(aq
