types of thiosulfate leaching of gold from ores

types of thiosulfate leaching of gold from ores

  • 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 which can make cyanide unattractive in some circumstances. However there are also

  • Thiosulfate leaching of gold—A review ScienceDirect

    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. In addition, thiosulfate can be cheaper than cyanide.

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  • Thiosulfate Leaching of Gold from Copper Bearing Ores

    Thiourea leaching from an oxidized gold-copper ore with 90-95% gold extraction was also reported (McInnes et al., 1989). However, acid pre-leaching of soluble copper was required in order to reduce thiourea consumption to acceptable levels. Ammoniacal Thiosulfate Leaching. Ammonium thiosulfate has been used in photography for many decades.

  • A study of thiosulfate leaching of gold from carbonaceous

    5. Decomposition of thiosulfate was found to be g r eater at high temperatures. The optimum conditions for extraction of gold were found to be pH of 10.5, and temperature of 35°C. At these optimum conditions, 73 percent gold extraction was obtained. It was also shown that thiosulfate will leach gold from oxide ores but not as effectively as

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  • pretreatment of refractory ores prior to gold leaching

    Refractory Gold Ore Treatment MethodsMetallurgical ContentGold Leaching Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering

  • Barrick Thiosulfate Leaching of Double Refractory Ore

    the ore, but autoclaves cannot; autoclaves can only remove the sulfides. 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

  • Thiosulfate leaching of gold—A review ScienceDirect

    Feb 01, 2001· TABLE 7 Suggested resins for gold thiosulfate adsorption (after Thomas et al., 1998) Resin Type Manufacture Dowex M-41 Type I Dow chemical Dowex MSA- 1 Amberlite IRA-904 Amberlite IRA-910 Type II Type I Type II Dow chemical Rohm&Haas Rohm&Haas Lewatit M-600, MP 500 Bayer Gel-type resin 21K Dow chemical Pulp ,1 Leach 1 RIP Au + Cu Tails And

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  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in stirred tank reactors or heaps, the size and type of equipment needed for a thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our

  • thiosulfate leaching Gold Refining Forum

    May 19, 2011· 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 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 Mining SGS

    Thiosulfate 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. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign.

  • A Review of Ammoniacal Thiosulfate Leaching of Gold: An

    This 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

  • Thiosulfate Leaching Thiosulfate leaching is an alkaline

    Mar 17, 2019· Thiosulfate Leaching Thiosulfate leaching is an alkaline process which removes gold from carbonaceous ores instead of using cyanide. It is less destructive and toxic, and has a higher efficiency with preg-robbing ores as a leaching agent. The major chemical components of thiosulfate are common fertilisers which include ammonium thiosulphate and ammonium sulphate.

  • The treatment of copper-gold ores by ammonium thiosulfate

    The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide

  • (PDF) A Review of Thiosulfate Leaching of Gold: Focus on

    of gold in a silicate-type ore was ext racted by nickel-ammonia-catalyzed thio sulfate leaching, and thiosulfate consumption was only 1.2 kg/t-ore [4 4]. The dissolved gold in nickel-ammonia-c

  • Thiocyanate leaching of gold UBC Library Open Collections

    This study focused on evaluating sodium thiocyanate as an alternative reagent to the conventional cyanidation process for leaching of gold ores. Goldcorp’s Coffee project in Yukon-Canada supplied three mineral samples namely, Supremo Oxide 68151, Supremo oxide 68151, Supremo Composite 72142 for this study. As a baseline for comparison with thiocyanate extraction results, cyanidation

  • Gold leaching by organic base polythionates: new non-toxic

    Thiosulfate leaching of gold represents a potentially attractive alternative to a respective cyanation process at least for three types of auriferous ores. Firstly, in auriferous ores containing an organic carbon material, the recovery of gold by thiosulfate leaching is generally significantly higher due to the insensibility of the thiosulfate

  • (PDF) Gold dissolution in non-ammoniacal thiosulphate

    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

  • Biooxidation-Thiosulfate Leaching of Refractory Gold

    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 (10 μm) were encapsulated in pyrite and arsenopyrite, while the amount of monomer gold was only 21%.The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold

  • thiosulfate leaching Gold Refining Forum

    May 19, 2011· 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 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.

  • GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING

    thiosulfate leaching of gold (Chen, 2008). This shows how much a mineralogical investigation is important to be performed before leaching study of any gold ore by the thiosulfate process. Several gold localities are scattered in the Arabian Shield of the kingdom of Saudi Arabia which has about 20 million tons of recoverable gold ores.

  • AMMONIUM THIOSULFATE LEACHING OF AN OXIDE GOLD

    AMMONIUM THIOSULFATE LEACHING OF AN OXIDE GOLD-COPPER ORE Araki, C.D.', Ciminelli, V.S.T.1, Freitas, L.R.2 Whether or not this conclusion is valid for ali types of ores is a matter opened for discussion. At ali events, the results of the present work, in which an oxide gold-copper ore was

  • NIOSHTIC-2 Publications Search 10011646 Copper

    The models predicted 90-pct gold extraction and a consumption of 0.2 Kg s2o2- 3/t ore at 0.20M s2o2-3, 0.00625M so2-3, 0.001.M cu2+, 0.09M nh4oh, and leaching for 48 h. Actual tests resulted in 83-pct gold extraction with 0.4 Kg s2o2-3 consumed /t ore.

  • Going for gold: Alternative processing methods

    Jan 17, 2014· Thiosulfate was chosen for in-situ or in-place leaching of gold as it is more environmentally friendly than cyanide, however its stability and rate of gold recovery is

  • Process Mineralogical Study of the Arsenical Zone from a

    May 28, 2020· In this study, mineralogical and microanalysis characterization, as well as diagnostic leaching and cyanidation tests, were performed to gain a better understanding of the refractory nature of the arsenical zone of a Carlin-type gold deposit and also to evaluate possible treatment routes to maximize gold recovery. The results obtained showed that only 56% of the ore’s gold content is

  • Thiosulfate Leaching Thiosulfate leaching is an alkaline

    Mar 17, 2019· Thiosulfate Leaching Thiosulfate leaching is an alkaline process which removes gold from carbonaceous ores instead of using cyanide. It is less destructive and toxic, and has a higher efficiency with preg-robbing ores as a leaching agent. The major chemical components of thiosulfate are common fertilisers which include ammonium thiosulphate and ammonium sulphate.

  • AMMONIUM THIOSULFATE LEACHING OF AN OXIDE GOLD

    AMMONIUM THIOSULFATE LEACHING OF AN OXIDE GOLD-COPPER ORE Araki, C.D.', Ciminelli, V.S.T.1, Freitas, L.R.2 Whether or not this conclusion is valid for ali types of ores is a matter opened for discussion. At ali events, the results of the present work, in which an oxide gold-copper ore was

  • The treatment of copper-gold ores by ammonium thiosulfate

    The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide

  • NIOSHTIC-2 Publications Search 10011646 Copper

    The models predicted 90-pct gold extraction and a consumption of 0.2 Kg s2o2- 3/t ore at 0.20M s2o2-3, 0.00625M so2-3, 0.001.M cu2+, 0.09M nh4oh, and leaching for 48 h. Actual tests resulted in 83-pct gold extraction with 0.4 Kg s2o2-3 consumed /t ore.

  • Process Mineralogical Study of the Arsenical Zone from a

    May 28, 2020· In this study, mineralogical and microanalysis characterization, as well as diagnostic leaching and cyanidation tests, were performed to gain a better understanding of the refractory nature of the arsenical zone of a Carlin-type gold deposit and also to evaluate possible treatment routes to maximize gold recovery. The results obtained showed that only 56% of the ore’s gold content is

  • Thiocyanate leaching of gold UBC Library Open Collections

    This study focused on evaluating sodium thiocyanate as an alternative reagent to the conventional cyanidation process for leaching of gold ores. Goldcorp’s Coffee project in Yukon-Canada supplied three mineral samples namely, Supremo Oxide 68151, Supremo oxide 68151, Supremo Composite 72142 for this study. As a baseline for comparison with thiocyanate extraction results, cyanidation

  • GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING

    thiosulfate leaching of gold (Chen, 2008). This shows how much a mineralogical investigation is important to be performed before leaching study of any gold ore by the thiosulfate process. Several gold localities are scattered in the Arabian Shield of the kingdom of Saudi Arabia which has about 20 million tons of recoverable gold ores.

  • Biooxidation-Thiosulfate Leaching of Refractory Gold

    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 (10 μm) were encapsulated in pyrite and arsenopyrite, while the amount of monomer gold was only 21%.The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold

  • Microwave pretreatment of a double refractory gold ore

    Abstract Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an

  • Gold cyanidation Wikipedia

    Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex.It is the most commonly used leaching process for gold extraction.. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents

  • Alternative Lixiviants to Cyanide for Leaching Gold Ores

    Of these, copper-catalyzed ammoniacal thiosulfate-leaching system has been most extensively studied, with most work focused on understanding and applying the system to carbonaceous ores and copperegold ores, where gold recovery is poor when using cyanide or cyanide consumption is high.

  • Cyanide-free gold recovery CSIRO

    Aug 02, 2019· Thiosulphate dissolves the fine gold out of ores (the gold that has not recovered by gravity) at similar rates to conventional techniques. It's safe and lowers environmental impacts. The method has undergone intensive testing in the laboratory to understand its leaching performance in association with reagent recovery and recycle.

  • A Study of the Modes of Gold Loss in the Calcium

    The evermore increasing complexity of gold ores is forcing operations to seek alternative gold leaching reagents to the traditional use of cyanidation. At the Barrick Goldstrike mine, the implementation of a non-toxic thiosulfate leaching process is about to become an industrial reality. With modification to the existing infrastructure and leaching circuit, this new process allows for the

  • Going for gold: Alternative processing methods

    Jan 17, 2014· Thiosulfate was chosen for in-situ or in-place leaching of gold as it is more environmentally friendly than cyanide, however its stability and rate of gold recovery is