·3 2 H 2 A somewhat similar problem exists during the pressure leaching of refractory gold ores to decompose pyrite or arsenopyrite to free the gold values akaganeite; lepidocrocite can be formed during commercial iron precipitation depending on the solution composition and exact operating conditions Davey and Scott 1975
Cyanidation has been used to extract gold and silver from ores concentrates and calcines since the 1890s The precipitation of gold from cyanide solutions by zinc cementation was patented in 1884 and was applied industrially as early as the cyanidation process
·The same applies in a less degree to the use of iron screening on the zinc trays and some metallurgists have substituted screens made of fibre or some non metallic material Average value of solution before precipitation $ in gold and oz in silver Average value of solution after precipitation at the rate of 15 tons per hour
·collection of gold iron tin and platinum occurs demonstrating that adaptable selective metal precipitation is controlled by just one variable This discovery could be exploited in metal
·The simple diamide ligand L was previously shown to selectively precipitate gold from acidic solutions typical of e waste leach streams with precipitation of gallium iron tin and platinum possible under more forcing conditions Herein we report direct competition experiments to afford the order of selectivity Thermal analysis indicates that the gold gallium and iron
·Current practice focusses on the precipitation of four species iron hydroxide the jarosites and hematite Precipitation of impurity ions from zinc leach solutions with high iron contents A special emphasis on cobalt precipitation Hydrometallurgy Volume 164 2016 pp 118 124
·Hydrometallurgical gold recovery processes play a pivotal role in the gold mining industry contributing to more than 90% of global gold production Among the array of techniques available the Merrill Crowe process adsorption ion exchange and solvent extraction are central in extracting gold from leach solutions While the Merrill Crowe process and gold complex
·Ferrous sulfate has an disadvantage it contain iron So when dropping gold you inevitably introduce a lot of iron to the solution If we take it more analytically iron II oxidation is one electron process So for one auric ion you need 3 ferrous sulfate molecules This reaction has very low "atom economy" as it is named these days
·The jarosite process was developed in the 1960s and is nowadays the most important way for the removal of iron from zinc leach liquor Jarosite is a basic iron sulphate with the general formula XFe 3 SO 4 2 OH 6 whereby X can be represented by monovalent cations such as K NH 4 Na Ag H 3 O or 1/2 Pb Bayliss et al 2010 Jarosite
·having caused precipitation of gold is found Tellurium usually classed as a non metal may interact with gold chloride in solution to precipitate gold as shown by the following equation 2 3Te 4AuCl3 = 4Au 3TeCl4 This may account in part for the precipitation of gold in the oxidized portion of gold telluride deposits II
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