leaching gold iodide

Apr 19, 2013· 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

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  • us4557759a iodine leach for the dissolution of gold

    us4557759a iodine leach for the dissolution of gold

    A process for the hydrometallurgical recovery ofgoldfrommaterials containing gold comprising leachingthe materials with alixiviant containing iodine.To a solution concentrated with natural

  • leaching and adsorption of gold from waste printed circuit

    leaching and adsorption of gold from waste printed circuit

    Iodine-iodide leaching and activated carbon adsorption processes for recovery of gold (Au) from waste printed circuit boards (WPCBs) were discussed in this paper. Apressure oxidative acid leaching (POAC) was carried out in an autoclaveusingdiluted sulfuric acid (1M H 2 SO 4 ) solutionin order to remove high concentrations of some base metals especially copper (Cu), aluminum (Al), iron (Fe) and zinc (Zn) due to their negative effect ongold…

  • iodine gold leaching

    iodine gold leaching

    Over the last few years there has been an intense effort to identify lixiviants other than cyanide forgoldand silverleaching. Bromide andiodidealso exhibit the ability to form polyhalide complexes. This characteristic promotes the dissolution of Br2(s) and I(2)s in aqueous solution. Iodine reacts withiodideion as follows: I(2)s = I2(aq

  • alternative lixiviants to cyanide for leaching gold ores

    alternative lixiviants to cyanide for leaching gold ores

    Jan 01, 2016·Chlorine, bromine,and iodine are well-known lixiviants for leaching gold, as reviewed by Tran et al. (2001). Chlorination was applied extensively in the late 19th century before the introduction of the cyanidation process. Bromine/bromide for leaching gold from ores was reported as early as 1846

  • flexicone technology for sulfide ores flexicone

    flexicone technology for sulfide ores flexicone

    Iodine-iodide technology leaching of gold, silver and palladium from ores and concentrates. We have developed iodine-iodide gold leaching technology in an environment with a pH of 4-9. This technology isuniversal and makes it possible to operate the system under less corrosive conditions with a lower concentration ofiodine

  • iodine 7%leachforgold gold refining

    iodine 7%leachforgold gold refining

    Sep 20, 2007· Typically 24-48 hours to collect fine gold. The leach will only stop working when the PH rises to 7. Mix everything together in your container, making sure you have fresh air circulation, as confined. Iodine fumes can be toxic, and burn your eyes. For agitation, you can add a …

  • recovery of gold from electronic waste by iodine iodide

    recovery of gold from electronic waste by iodine iodide

    Leaching experiments were carried out in solutions, containing 25 g l-1 iodine and 100 g l-1 KI, under room temperature, rotating speed of 500 rpm and mass ratio of 1:10. The degree of gold

  • iodide pressure oxidation gold leaching autoclave

    iodide pressure oxidation gold leaching autoclave

    Table of ContentsEffect of stirring speedEffect of temperatureEffect of partial pressure of oxygenEffect of potassiumiodideconcentrationEffect of pH ofiodidesolution The pressure oxidation process is especially suitable for the sulfide type of refractory ores. It includes two stages of operation. First, the refractory ore is subjected to an autoclave oxidation. At elevated temperatures

  • study on gold concentrate leaching by iodine iodide

    study on gold concentrate leaching by iodine iodide

    Among them, an iodine-iodide solution is a highly selective and efficient leaching agent for the recovery of gold from gold ores and WPCBs [21, [23] [24][25]. Several decades ago, the first

  • non cyanideleaching processes in gold hydrometallurgyand

    non cyanideleaching processes in gold hydrometallurgyand

    Aug 25, 2014· (2015). Non-cyanideLeaching Processes in Gold Hydrometallurgy and Iodine-Iodide Applications: A Review. Mineral Processing and Extractive Metallurgy Review: Vol. 36, No. 3, pp. 198-212

  • recovery of gold from electronic waste by iodine iodide

    recovery of gold from electronic waste by iodine iodide

    Leaching experiments were carried out in solutions, containing 25 g l-1 iodine and 100 g l-1 KI, under room temperature, rotating speed of 500 rpm and mass ratio of 1:10. The degree of gold

  • iodinegold leaching gold refining

    iodinegold leaching gold refining

    Apr 24, 2020· Iodineleachmakes most sense as it mostly ignores the trash metals, and is recyclable.However, according to the research done by the patent filers,iodideAND iodine must be present for it to work effectively. 2:1 ratio ofiodideto iodine. There are about a dozen or more papers done on thisleachinggoing back to the early 1900's

  • leaching and electrochemical behavior of goldin iodine

    leaching and electrochemical behavior of goldin iodine

    The comparision ofgold leachingbetweeniodideand cyanide is also presented, in which a rate constant of about 2.6×10-9 mol/cm2·sec for 10-2 M I- and 5×10-3 M I2 was obtained. This value is close to that for typical cyanidation. Cyclic voltammetry experiments were also performed to examine the electrochemical nature of the reaction

  • iodineleachfor the dissolution ofgold in situ, inc

    iodineleachfor the dissolution ofgold in situ, inc

    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

  • recovery ofgoldfrom electronic waste by iodine iodide

    recovery ofgoldfrom electronic waste by iodine iodide

    The aim of this research is to investigate the possibility of iodine-iodide gold recovery from gold-plated metal, which is a waste product of the electronic industry. Leaching experiments were carried out in solutions, containing 25 g l-1 iodine and 100 g l-1 KI, under room temperature, rotating speed of 500 rpm and mass ratio of 1:10

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