chlorine leaching dissolving gold in lithuania

Allow four hours for the gold to dissolve stirring every 20 minutes The chlorine reacts with the gold inside the ore to form gold chloride Filter the ore and bleach solution to remove all the impurities such as soil and rock fragments

Jun 01 2007 · Chlorine had been used to dissolve gold from ores and concentrates during the second half of the 19th century in Australia and North America At the beginning of the 20th century this process was gradually replaced by the more economical alkaline cyanide leaching Sparrow and Woodcock 1995 Nowadays however due to the realization of environmental problems of cyanide there is a

Oct 10 2019 · Chlorine gas was applied as early as the 19th century for gold leaching with Cl 2 originating from hydrochloride acid on manganese oxide Habashi 2005 Marsden and House 2006 In addition bromide bromine cyanide thiosulfate and thiourea were known as early as the late 1800s and early 1900s Marsden and House 2006

The capacity of chlorine based solutions to rapidly and effectively dissolve coarse gold in oxide ores is well established The inherent advantages of chlorine are high dissolution rates 10 – 100 times those of cyanide and low cost The high dissolution rates mean that coarse or poorly liberated gold may be dissolved over relatively short

The method consist in leaching the gold with chlorine resulted from NaClO decomposition in hydrochloric acid medium AuCl4 selective recovery from hydrochloric solutions by adsorption

Mar 15 2018 · This leaching process has several advantages it uses a gaseous mixture of chlorine and bromine that is generated insitu by introducing hypohalides in the reactor itself the capability of chlorine to oxide bromides implies that a low concentration of bromide is required in the leaching solution gold is simultaneously leached by chlorine and bromine and finally the hypohalides could be further

Hot mixtures of hydrochloric acid with strong oxidizing compounds are known to generate insitu nascent chlorine which is capable of dissolving gold efficiently

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Dec 03 2009 · Heres a chlorine leach for you CaCl2 CaOClH H2SO4 this is from the textbook on the metallurgy of gold and was used in lead lined vats to generate chlorine and to leach ores Also just a note most pool chlorine is not calcium hypochlorite

The capacity of chlorine based solutions to rapidly and effectively dissolve coarse gold in oxide ores is well established The inherent advantages of chlorine are high dissolution rates 10 – 100 times those of cyanide and low cost The high dissolution rates mean that coarse or poorly liberated gold may be dissolved over relatively short

Sep 01 2013 · This paper deals with gold extraction from a refractory concentrate by chlorine leaching The process considers a pretreatment of refractory materials by low temperature oxidation carried out with low oxygen concentration The oxidized material is treated by leaching with brine

Leaching of gold from an oxide gold ore in chloridehypochlorite solutions was performed to study the effects of operating conditions on the leaching performance and gold complexes stability

Jun 10 2010 · Acid leaching systems pH ⩾ 3may contain thiourea thiocyanate chlorine aqua regia or ferric chloride Chloride is the ligand in the last three systems and the oxidants include chlorine ferric chloride hydrogen peroxide and nitric acid which produce AuIII anionic complexes eg AuClJ

The hydrometallurgical leaching of native gold from goldbearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using hazardous chemicals such as sodium cyanide or aqua regia These chemicals represent health and safety risks for workers and a serious threat for the environment

Feb 01 2012 · 1 Introduction Chlorine has been used to dissolve gold from ores and concentrates during the second half of the 19th century This process was later replaced by the more economical alkaline cyanide leaching Sparrow and Woodcock 1995Currently due to the environmental problems of cyanide there is a need to find viable alternatives to cyanide

lurgical gold extraction routes utilize a leaching step to produce a goldbearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolution of the precious metal Therefore A Method for Leaching or Dissolving Gold from Ores or Precious

Leaching of Gold A Nikoloski1 and N Stockton2 ABSTRACT Some preliminary results on the secondary leaching of previously heap leached gold ore are presented Alternative lixiviants for gold comprising chlorine thiourea and thiosulphate were compared with cyanide using bottle roll tests Chlorine was subsequently selected for column leaching tests

Feb 05 2013 · From Getting Gold A practical treatise for prospectors miners and students Written by JCF Johnson FGS 1898 The most scientific and perfect mode of gold extraction when the conditions are favourable is lixiviation by means of chlorine potassium cyanide or other aurous solvent for by this means as much as 98 per cent of the gold contained in suitable ores can be converted into

Gold cyanidation Wikipedia Gold cyanidation also known as the cyanide process or the MacArthurForrest process is a hydrometallurgical technique for extracting gold from lowgrade ore by converting the gold to a watersoluble coordination is the most commonly used leaching process for gold

The problem with gold explained Foley is that it is one of the least reactive chemical elements making it difficult to dissolve That is why artifacts discovered from 3000 year ago still have

Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig 1 The Pourbaix diagram of Fe–S at Fe – 10 4 M S 10– M and 25 C the chlorine species regions are also marked Marsden and House 2005 Fig 2

gold electrode m2 and t is the time elapsed s Thus the slope of the kinetic plot is a measure of the leaching rate It can be seen from Figure 1 that the goldsilver leach rate increases as a function of time eventually reaching a steady state value after 350s At steady state the leaching rate for goldsilver is

The results showed that gold could be dissolved in exceptionally mild conditions when an appropriate adsorptionreduction activated carbon site was provided immediately after leaching