Jun 15 2017 0183 32 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...
Despite the fact that the gold mining industry accounts for only 13 of total cyanide consumption there is growing public concern over the use of toxic cyanide for gold extraction Many researchers have identified that thiosulfate leaching is the most likely alternative to cyanidation due to nontoxicity low cost and other benefits...
recovered powders from a sodium thiosulfate leach of gold plated pins if all my experiments can be perfected i will have a safe non-toxic process to remov...
UNII-CKS1YQ9W1J Sodium aurotiosulfate CKS1YQ9W1J 33614-49-2 gold sodium thiosulfate dihydrate...
FIELD recovery of precious metals by leaching SUBSTANCE hydrometallurgical process of recovery of precious metals from refractory ores of precious metals containing carbon by thiosulfate leaching includes creation of mass of particles and/or macroparticles of ore material containing precious metals and carbon components absorbing precious metal content introduction of mass of particles and...
May 01 2003 0183 32 Ammonium thiosulfate is a noncyanide lixiviant for gold leaching However the major problem with this leaching method has been the high consumption of reagents To leach a mild-refractory copper-bearing gold ore the authors used a reagent combination of 03M NH4 2S2O3 003M CuSO4 and 3M NH3 at pH 102 for 24 hours In the testing thiosulfate consumption was 30 kg/t of...
Sep 01 2000 0183 32 This leads to the decrease in the leach rate as the copper II -thiosulfate reaction occurs Thiosulfate leaching kinetics of gold in presence of copper and ammonia 1075 x 6 4 2 IBm ii I lOmM 5mM 0 o 1 o b do do loo Cu ll Fig3 Effect of total copper concentration on gold leaching...
Jun 19 2015 0183 32 The CSIRO-patented cyanide-free thiosulphate process is adding value to Barrick Gold Corporation s gold operation The first gold bar produced with...
Aug 15 2020 0183 32 A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated Mineralogical studies on the concentrate showed that very fine gold grains...
A comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically more advantageous Description Online access for this thesis was created in part with support from the Institute of Museum and Library Services IMLS administered by the Nevada State Library Archives...
Thiosulfate leaching appears to be one of the most promising alternatives to cyanidation Understanding gold thiosulfate leaching system plays a crucial role in order to effectively extract gold in which the kinetics and equilibrium adsorption of thiosulfate polythionates gold thiosulfate and copper onto resin in...
Dec 06 2017 0183 32 Column leaching tests with thiosulfate further demonstrated that 69 to 78 pct of the gold could be directly recovered while consuming 04 to 54 kg thiosulfate/mt ore Continuous recycle of the leach solution led to increased leaching times for comparable precious metal recoveries but also significantly increased the concentration of gold in...
Gold and silver leaching in thiosulfate solution is preferable kinetically and environmentally if conducted in a closed vessel systemThe effect silver alloyed with gold was evaluated and the result showed that the dissolution rate of pure gold is higher than that form 4 and 8 wt Ag alloys And the dissolution rate of gold from 20 and 50...
May 19 2011 0183 32 out 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 situationBits 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...
Ammonium thiosulphate is an alternative gold leaching Laaviant used to replace cyanide The current problem of thiosulphate gold leaching is the high reagent consumption To understand the decomposition chemistry of thiosulphate solution stability tests were conducted in open and sealed vessek mder ambient temperature...
In a resin-in-leach system full gold recovery was also achievable with sufficient resin after 24 h leach with 006 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...
leaching of gold as its absence makes gold passive by the build up of sulphur coating on the surface as a result of decomposition of thiosulphate It is known that thiosulphate is a meta-stable species that readily undergoes decomposition in aqueous solutions Ammonia adsorbs onto the gold surface preferentially over...
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 dissolved gold In this review the four solutions to reduce the consumption of thiosulfate including the control of reaction conditions the use of additives the generation of thiosulfate in situ and...
Jun 14 2019 0183 32 This is a relatively expensive leach solution which will consume high levels of thiosulfate during leaching The gold/silver thiosulfate complexes load very poorly onto carbon and resin Recovery is by precipitation onto either zinc copper or iron filings No de-aeration is required prior to the precipitation step...
Thiosulfate leaching has great potential for the treatment of carbonaceous ores due to the low adsorption of gold thiosulfate complex on carbonaceous matter kçıl et al Also the interference of foreign cations with thiosulfate leaching is rather limited compared with cyanide leaching...
In thiosulfate gold leaching Cu2 ions are commonly used as oxidizing agents while the thiosulfate ion acts as a ligand forming a soluble gold thiosulfate-ammonia complex Aylmore and Muir 2001 It was suggested that gold leaching in the absence of Cu2 ions with an external current acting as a oxidizer is not possible...
A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated Mineralogical studies on the concentrate showed that very fine gold grains...
Jun 02 2016 0183 32 Sodium 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...
Abstract Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold extraction In the present...
Oct 06 2016 0183 32 First time any company in the western world produces gold on a commercial scale using thiosulfate From left to right Chief Metallurgists Janet Baron and Averne Flaharty-Escobar Director of Strategic Technology Solutions Yeonuk Choi and Senior Director of Strategic Technology Solutions Peter Kondos accept the MetSoc Innovation Award on behalf of their team that developed the thiosulfate...
Jan 11 2016 0183 32 Thiosulfate Gold Extraction Leach These solutions have very little solving action upon the natural sulphide contained in gold-bearing ore and should be suitable solutions for the treatment of gold or silver ore as they have a greater solving power than cyanide of potash are not poisonous and can be obtained in very large quantities at a...
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...
Abstract One of the major problems of thiosulfate leaching was the high consumption of thiosulfate In this work additive was used to reduce thiosulfate consumption and simultaneously increase gold leaching Thiosulfate leaching without additive was not effective to treat a refractory gold concentrate calcine with high iron sulfur and arsenic due to its low gold extraction 727 and high...
The gold leaching rate in ammonium thiosulfate in the presence of copper species is mainly controlled by the cathodic process which is under diffusion or mixed kinetics control The results of the rotating gold disk leaching study are consistent with those from the electrochemical study The gold leaching process in...
An improved thiosulphate leach process for the recovery of gold from ores and other gold-bearing materials characterised in that the leach solution comprises thiosulphate thiourea or a reagent chemically related thereto and an oxidant that does not oxidise thiosulphate the process producing a pregnant leach solution from which gold may be recovered...
Processes 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...
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 01-014 M thiosulfate and 02-03 M ammonia...
The thiosulfate-gold complex formed in thiosulfate leaching is not attracted to carbon so this failure to remove the carbon is no longer an issue Thus the use of thiosulfate with autoclave-processed double refractory ores does not result in the loss of the gold complex in the tails...
Thiosulfate Leaching of Gold from Copper Bearing Ores...
The invention provides the new technology of a kind of nickel citrate catalysis Leaching of Gold Using ThiosulfateIt is mainly characterized by using the catalysis of nickel citrate to replace traditional cuprammonium catalysis ie adds nickel sulfate in Leaching of Gold Using Thiosulfate ore pulp and citric acid or sodium citrate replaces copper sulphate and the addition of ammoniacal...