use of thiosulfate in gld leaching

  • 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.

  • Thiosulphate Leaching Mining SGS

    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. This technology offers great potential in those jurisdictions where the use of cyanide is banned outright, or is subject to intense negative

  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING 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

  • Gold recovery from ammonia-thiosulfate leaching solution

    Nov 01, 2019· Gold leaching in the ammoniacal thiosulfate system shows a complex dependence on the variation of the thiosulfate, copper and ammonia concentration in the solution. The concentration ratio of thiosulfate to ammonia should be maintained in a range of 0.5–1.0 ( Xu et al., 2017 ) in order to keep Cu(II) as Cu(NH 3 ) 4 2+ in the appropriate

  • Thiosulfate leaching of gold—A review ScienceDirect

    Feb 01, 2001· An alternative approach is to use thiosulfate to leach gold from ores. Thiosulfate is considered a non-toxic alternative to cyanide and can leach gold faster than cyanide. In the conventional cyanide process, the recovery of gold and silver from ores is hindered by a variety of metal impurities like copper, arsenic, antimony, zinc and nickel

  • A Review of Ammoniacal Thiosulfate Leaching of Gold: An

    (2016). A Review of Ammoniacal Thiosulfate Leaching of Gold: An Update Useful for Further Research in Non-cyanide Gold Lixiviants. Mineral Processing and Extractive Metallurgy Review: Vol. 37, No. 6, pp. 385-411.

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

    A Review of Thiosulfate Leaching of Gold: Focus on Thiosulfate Consumption and Gold Recovery from Pregnant Solution Article (PDF Available) in Metals Open Access Metallurgy Journal 7(6):222

  • FUNDAMENTAL ASPECTS OF GOLD LEACHING IN

    2.2 Stability of thiosulfate solution 16 2.3 Leaching of gold in thiosulfate system 19 2.4 Research on the kinetics and mechanism 25 2.4.1 Passivation phenomena 25 2.4.2 Kinetics study of gold thiosulfate leaching 27 2.4.3 Mechanism of gold thiosulfate leaching 37 2.5 Additives studies 44 3. EXPERIMENTAL APPROACH 48 3.1 Introduction 48

  • 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.

  • COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING

    Before leaching the gold, ore must be crushed and grinded into small particles, usually particle size varies between 30 and 180 μm. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.

  • 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.

  • thiosulfate leaching gold process 】

    Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. SGS developed the thiosulfate leaching process because in some jurisdictions, increased regulation pressure means that cyanide cannot be used or transported. Inquire Now; thiosulfate leach of gold

  • sodium thiosulfate use for gold leaching

    Sodium thiosulfate WikipediaSodium thiosulfate (sodium thiosulphate) is a stone and medication. As a medication it is used to treat cyanide poisoning and pityriasis versicolor.Gold cyanidati&sodium thiosulfate use for gold leaching

  • Solidification of sulfur and arsenic in gold concentrate

    The processing of refractory minerals rich in arsenic and sulfur often causes give off arsenic and sulfur contamination during roasting and oxidation pretreatments. In this paper, the solidification

  • Thiosulfate leaching of gold—A review Semantic Scholar

    Abstract The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The application to different ore types and process options have also been discussed. The thiosulfate leaching process it catalysed by copper and has several advantages over the conventional

  • 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

  • A Review of Ammoniacal Thiosulfate Leaching of Gold: An

    (2016). A Review of Ammoniacal Thiosulfate Leaching of Gold: An Update Useful for Further Research in Non-cyanide Gold Lixiviants. Mineral Processing and

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

    It was proposed to use polythionate organic bases as efficient gold eluting agents from an anion exchanger, after leaching with a thiosulfate (Fleming et al. 2002; Matthew 2007). Thiosulfate leaching of gold represents a potentially attractive alternative to a respective cyanation process at least for three types of auriferous ores.

  • Ammoniacal Thiosulfate Leaching Of Gold Ore

    A Study Of Thiosulfate Leaching Of Gold From Carbonaceous. While a high percent extraction of gold was obtained from the carbonaceous ore poor recovery of gold was observed from the sulfide ore which is also a refractory ore as is the carbonaceous ore a comparison of thiosulfate with cyanide leaching of gold from carbonaceous ore showed that thiosulfate is chemically better and economically

  • COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING

    Before leaching the gold, ore must be crushed and grinded into small particles, usually particle size varies between 30 and 180 μm. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.

  • thiosulfate gold leaching micheldeegens

    The use of activated carbon as catalyst in the thiosulfate leach of gold is a process alternative that may not require the addition of surrogate oxidants (like copper), can work at temperatures as low as 30 °C, and thiosulfate degradations of 2.1 kg per ton of ore or lower, making it an attractive alternative for the leaching of gold.

  • Thiosulfate-copper-ammonia leaching of pure gold and

    Keywords: gold leaching, thiosulfate, quartz crystal microbalance Introduction The industrially applied leaching method for gold ores and concentrates involves the use of cyanide as a ligand for dissolution of gold. Cyanide is technically and economically a viable method for gold processing, and therefore it is hard to bring a

  • US6632264B2 Gold recovery from thiosulfate leaching

    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

  • A Kinetic Study That Compares the Leaching of Gold in the

    Jan 26, 2001· gold leaching in cyanide, ammonia/thiosulfate, and chloride/hypochlorite solutions. The gold leach rates were measured using a rotating electrochemical quartz crystal microbalance (REQCM). This instrument allows the mass of a gold sample to be measured in situ, with a

<< Previous: Mining Iron Ore Cone Crusher
>> Next: Tender Detail For Port Kembla Cement Mill