barrick thiosulfate leaching of double refractory orethe leaching of gold is then accomplished by maintaining a temperature of 50-70⁰c.7 the 2009 patent15 mentions that the thiosulfate concentration in the leaching container may have to be subsidized with more thiosulfate as the test goes along “to prevent the re- precipitation of gold as its sulfide.”
barrick thiosulfate leaching of double refractory orethe leaching of gold is then accomplished by maintaining a temperature of 50-70c.7 the 2009 patent15 mentions that the thiosulfate concentration in the leaching container may have to be subsidized with more thiosulfate as the test goes along to prevent the re- precipitation of gold as its sulfide. the overall thiosulfate leaching process in (pdf) a review of thiosulfate leaching of gold: focus on pdf thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of leaching gold and silver with an alternative system, glycine these features were studied for the treatment of mine tailings from a mexican mine. both systems were evaluated by 48-h leaching tests at different liquidsolid ratios (in the range of 1:1, 2:1 and 3:1) and showed significant recoveries of gold, > 80%, with thiosulfate as well as considerable consumption of thiosulfate. thiosulfate-copper-ammonia leaching of pure gold and pressure thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate 1087. with increasing slurry density due to faster reduction of oxidized species to reduced species (cupric reduction to cuprous) and the absence of oxygen feed regenerating the oxidant. gold leaching by organic base polythionates: new non-toxic the proposed method of the gold recovery comprises leaching with a solution of a mixture of sodium and ammonium hydrosulfite and thiosulfate, by sorption of the thiosulfate-gold complex on a highly basic anion exchanger and by isolation of the highly basic anion exchanger, the sorption being carried out 2-10 hours after the leaching. thiosulfate leachingout if thiosulfate is a viable process for extracting gold. i would like to hear the facts,from someone that has used it in a real mining situation.bits and pieces of information are what is dangerous with any process. i have edited this to include some information that may help the forum members in the future, and one in particular. thiosulphate leaching an alternative to cyanidation in gold thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. although not as aggressive a leaching agent as cyanide, thiosulphate offers several technological advantages including its lower toxicity and greater efficiency with gold deposits associated with preg-robbing ores. ammonium thiosulfateit is also used in the presence of copper as a catalyst in the leaching of gold and silver. when mixed with water ammonium thiosulfate can be used as a fertilizer and as an additive to coal-waste mixtures to reduce formation of dangerous dioxins and furans. fundamental aspects of gold leaching in thiosulfate solutions the effect of concentration of different reagents, applied potential, ph, temperature, and electrode rotating velocity on the gold leaching rate have been investigated. the effect of solution copper species on the anodic reaction of gold dissolution in thiosulfate solution was elucidated using the reqcm. (pdf) thiosulfate leaching of gold from waste mobile phones the influence of thiosulfate, ammonia and copper sulfate concentrations on the leaching of gold from pcbs of waste mobile phones was investigated. gold extraction was found to be enhanced with solutions containing 15-20. mm cupric, 0.1-0.14.
how to leach gold with sodium thiosulfatefinally, filter and discard the sand from the pregnant liquor. then the fun begins. it isnt easy to extract the gold from the resulting sodium aurothiosulfate, which is a distressingly stable compound. youd probably be better off using cyanide for the leaching, and just keeping the thiosulfate handy as an antidote in case you poison yourself. us6632264b2processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. the processes include subjecting the gold-bearing and copper-bearing thiosulfate solution to a ph and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an ion exchange resin. thiosulphate leaching mining sgsthiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: thiosulfate leaching of gold ores has great potential to reduce the impact on the environment. this process results in recoveries that are close to those generated by cyanide leaching in leach gold using hyposulphite of sodium aka thiosulfate gold leach gold using hyposulphite of sodium aka thiosulfate gold extraction. if to a solution of sodium hyposulphite, a solution of acetate of iron peroxide or any other acetate, such as acetate of soda or lime, is added, with perchloride or bromide of iron, the solution will turn dark red, the known reaction for acetic acid, effect of additives on thiosulfate leaching of a gold orein a resin-in-leach system, full gold recovery was also achievable with sufficient resin after 24 h leach with 0.06 m fresh ammonium thiosulfate and 2 mm edta at an agitation speed of 250 r/min. key words: gold leaching, thiosulfate, additives, leaching kinetics, thiosulfate stability thiosulfate leaching of golda reviewthe thiosulfate leaching process it catalysed by copper and has several advantages over the conventional cyanidation process. thiosulfate leaching can be considered a non-toxic process, the gold dissolution rates can be faster than conventional cyanidation and, due to the decreased interference of foreign cations, high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous-type ores. study on thiosulfate leaching of gold by cycling barren thiosulfate leaching is widely recognized as one of the most promising alternatives to cyanidation for gold leaching, of which the action of cyclic barren solution is of great importance as far as its commercial application is concerned. a review of ammoniacal thiosulfate leaching of gold: an abstractthis literature review provides an update of ammoniacal thiosulfate as a potential lixiviant of gold, the history of thiosulfate leaching and recent progress on thiosulfate leaching of gold, as well as the production, oxidation, and stabilization of thiosulfate. the leaching results of different types of gold ores including oxide, sulfide, carbonaceous, and refractory ores/concentrates and the fundamentals relevant to the oxidation of pure gold are summarized. using nickel as a catalyst in ammonium thiosulfate leaching using nickel as a catalyst in ammonium thiosulfate leaching for gold extraction harunobu arima1, toyohisa fujita2 and wan-tai yen3 1graduate student, queens university.. present address: akita zinc co., ltd., akita 011-8555, gold strike with thiosulphate mining.comthe csiro-patented cyanide-free thiosulphate process is adding value to barrick gold corporations gold operation. the first gold bar produced with the thiosulphate process was poured in late
thiosulfate leaching of golda reviewgold dissolution in thiosulfate leaching under ambient conditions the chemistry of the ammonia-thiosulfate - copper system is complicated due to the simultaneous presence of complexing ligands such as ammonia and thiosulfate, the cu(ii)-cu(i) redox couple and the possibility of oxidative decomposition reactions of thiosulfate involving the formation of tetrathionate and other additional sulfur compounds (umetsu and tosawa, 1972; kerley, 1981). a method for leaching or dissolving gold from ores or the hydrometallurgical leaching of native gold from gold-bearing 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 sodium thiosulphate gold leachingsodium thiosulphate gold leaching. the gold industry has been seeking alternative reagents for leaching gold from low-grade ores for the past 25 years. the cost and transport of cyanide, the poor recovery of gold from carbonaceous ores, the lack of selectivity of cyanide towards copper minerals and the cost of waste treatment are real factors which us8097227b2the barren thiosulfate lixiviant 150 can be recombined with the recycled pregnant leach solution and returned to the top of the heap. the barren lixiviant 150 will typically contain no more than about 0.01 ppm precious metals or 1% of the precious metal(s) in the pregnant leach solution 138. us8097227b2processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. the processes can employ heap leaching or lixiviants that include one or more blinding agents. gold strike with thiosulphate mining.comwithin the tanks, the slurry interacts with thiosulfate and a fine, bead-like material called resin that collects the gold. effect of additives on thiosulfate leaching of a gold orethiosulfate leaching of gold and the stability of thiosulfate and gold thiosulfate species. specifically, sulfide minerals retard gold leaching and catalyse the degradation of thiosulfate and gold thiosulfate. other reductants, e.g. carbonaceous matter, have also been found to affect the stability of thiosulfate and gold thiosulfate. thiosulfate leaching of goldthiosulfate leaching of gold - a review. another alternative that has been studied (in the laboratory) in previous works on the leaching of silver in sulfide or metal form with thiosulfate, is the addition of metal ions zn 2+ and cu 2+ , where these two oxidize the noble metals while thiosulfate forms stable complexes. thiosulphate dropped--testing for pm?during leaching ferric oxide, iron hydroxide and elemental sulfur will be in solids and copper in solution acting as oxidizer (oxygen rejuvenating the cupric ion) and gold will be left with the thiosulfate if this leach is working and if all conditions are maintained in solution, (< 9 ph, and temperature also seem to be factors). associated sulfide minerals in thiosulfate leaching of gold the effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore.