thiosulphate leaching of gold from ores

Thiosulfate Leaching of Gold from Copper Bearing Ores

2018/11/17 0183 32 Gold from Copper-Bearing Ores Gold is commonly associated with chalcopyrite association with tetrahedrite, tennantite, as well as bornite and chalcocite also occurs Unlike gold associated with pyrite and arsenopyrite in refractory ores, the gold particles in many chalcopyrite ores are often discrete, allowing a significant portion of gold ,...

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Gold recovery from refractory carbonaceous ores by ,

1996/07/16 0183 32 Wan et al, US Pat No 5,354,359, disclose leaching gold from preg-robbing ores with a thiosulfate lixiviant followed by cementation or precipitation of the leached precious metal valu PCT application WO 91/11539 discloses...

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leaching of gold silver by cyanide method is a redox ,

2019/12/31 0183 32 The silver ores are found along with gold ores in Gold Leaching Process Many opportunities exist throughout the world for small cyanide plants, possibly using a Gold Leaching Process, both for production and pilot operations, especially in areas not easily accessible, and where labor and local costs are on a level for profitable operation...

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Gold extraction

Gold extraction refers to the processes required to extract gold from its or This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore 1 Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold ....

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THIOSULFATE LEACHING OF SILVER FROM A SOLID ,

Thiosulphate leaching was examined with regard to the highest possible leaching efficiency and optimization process parameters The effect of thiosulfate ions concentration within the range from 025 to 100 mol/dm3 at a040 to 1 ....

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Barrick Thiosulfate Leaching of Double Refractory Ore

recover gold from double refractory ores instead of single refractory ores, gold has a strong affinity for the carbon in the ore slurry along with the activated carbon used to capture the gold in solution and thus, can be lost through the tails...

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COMPARISON OF CYANIDE AND THIOSULPHATE ,

Thiosulphate leaching can be considered as a non-toxic process It has its own pros and cons which have been discussed in this work The topics of this work are gold ores and their suitability for leaching processes, pretreatment...

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ThiosulphateasanAlternativetoCyanideforGoldProcessing ,

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 ....

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Thiosulphate as an alternative to cyanide for gold ,

2013/07/18 0183 32 Thiosulphate is an attractive alternative reagent to cyanide for processing gold or It is relatively cheap and non-toxic, forms relatively strong gold and silver complexes, and readily leaches gold ores in ammoniacal ....

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Gold strike with thiosulphate

2019/01/07 0183 32 Thiosulphate has long been seen as a potential alternative to cyanide for liberating gold from ores, but until now it has proved difficult to master Cyanide is highly toxic and an environmental hazard...

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A study of thiosulfate leaching of gold from ,

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, ,...

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Gold leaching by organic base polythionates new non ,

Gold leaching is the key stage in process of gold mining There are a few well-reputed leaching methods using a variety of different reagents Nowadays the most popular industrial processes include cyanide, thiourea, and...

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GOLD LECHING FROM A SAUDI ORE BY THE ,

Gold leaching from a Saudi ore by the nonpolluting thiosulfate process 61 thiosulfate media other than copper and ammonia Zhang et al, 2005 Chandra et al, 2005 Carbonaceous sulfide ores after oxidative pre-treatment are...

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Review of rate constants for thiosulphate leaching of ,

Table 1, Table 2 list the different types of ores/concentrates and conditions used in selected batch leaching experiments which considered the copper or gold leaching Berezowsky and Sefton, 1979, Zipperean et al, 1988, Jiang et al, 1993, Abbruzzesse et al, 1995, Molleman and Dreisinger, 2002, Feng and Van Deventer, 2002a, Feng and ,...

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thiosulfate 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 ....

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LR Freitas, RBE Trindade and T Carageorgos

THIOSULPHATE LEACHING OF GOLD-COPPER ORES FROM IGARAPE BAHIA MINE CVRD LR Freita/ RBE Trindade2 and T Carageorgos3 1Centre of Technology, Companhia Vale do Rio Doce, Santa Luzia-MO, Brazil2 ....

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Gold recovery from ammonia

1 Introduction 11 Chemistry of thiosulfate leaching of gold Since the 1880 s, Cyanidation has been the main method for the extraction of gold and silver from a wide range of ores, because of its high extraction efficiency and cost ....

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Kinetic Investigation and Dissolution Behavior of ,

Since these two reagents are the most promising cyanide alternatives for gold ores, a gold-silver alloy was used to see the effect of alloying elements onto the dissolution reaction Besides the four promising cyanide alternatives, also MSA was tested at 25 and 45 176 C with and without the addition of hydrogen peroxide...

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The role of ligands and oxidants in thiosulfate ,

gold and silver extraction during thiosulfate leaching and conventional cyanidation of oxide ores 21 In the case of gold ores of low silver grade 03 Ag g/t , thiosulfate leaching resulted low gold and silver extraction compared to...

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Thiosulphate Stability In Gold Leaching Process

gold ore to 62 with a thiosulphate consumption of 19kg/tSulphate addition could not ùnprove the thiosulphate stability significantiy, Gold Ieachmg at high pulp density 62 produced the same gold extraction and greatiy reduced the thiosulphate ....

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Thiosulphate Leaching Mining SGS India

2017/10/17 0183 32 Thiosulphate 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 thiosulphate leaching process are benign This technology ....

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The deportment of mercury during thiosulfate leaching ,

2010/11/01 0183 32 This paper reports on the behavior of mercury and its compounds during the thiosulfate leaching and recovery of gold Thiosulfate solutions are shown to dissolve Hg0 and Hg2Cl2 to a similar extent as cyanide, but the leaching of HgS is significantly slower in thiosulfate solutions compared to cyanide Hence, the use of thiosulfate may be an option for treating ores ,...

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Thiosulfate Leaching Thiosulfate leaching is an alkaline ,

2019/03/17 0183 32 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 ,...

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Sodium thiosulfate

Sodium thiosulfate sodium thiosulphate is an inorganic compound with the formula Na 2 S 2 O 3 x H 2 O Typically it is available as the white or colorless pentahydrate, Na 2 S 2 O 3 5H 2 O Na 2 S 2 O 3 Molar mass...

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Sodium Thiosulphate Gold Leaching

2017/03/17 0183 32 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 ,...

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Ammoniacal thiosulphate leaching of gold ore

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 study, an attempt is made to assess the...

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Recent Advances in the Development of an ,

Thiosulphate leaching of gold and silver ores has been studied by many researchers over the years and there is an extensive literature on the subject Some recent examples are the papers by Tozawa et al, 1981, Langhans et ....

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PDF Ammoniacal thiosulfate leaching of gold from a ,

Ammoniacal thiosulfate leaching of gold from a refractory ore using a full factorial design...

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PDF Treatment of a Copper

2012/01/01 0183 32 Cyanide leaching of the ore resulted in a gold extraction of only 22 while gold extractions as high as 62 were achieved by ammoniacal thiosulphate leaching The concentrations of thiosulphate ....

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Review of rate constants for thiosulphate leaching of gold ,

Analysis of initial rate data over the first 30-60 min of gold leaching from sulphide concentrates or silicate ores over a range of ammonia, thiosulphate, and copper II concentrations, pH 9-105 and temperatures up to 70 C shows...

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