Online Message

CONTACT US

message-img
  • Ammonium thiosulfate extraction of gold from printed

    01/01/2020· Gold extraction in ammonium thiosulfate medium from natural Au ores, which contains negligible amounts of unwanted and coexisting metals, is already well understood (Ilyas and Lee, 2018, Molleman and Dreisinger, 2002; Langhans and Carnahan, 1992). In Au extraction from e-wastes, however, the effects of coexisting metals (e.g., Cu, Zn, Al, Fe, Pb and Ni), which are abundant in e

    Details >
  • Ammoniacal thiosulphate leaching of gold ore

    environmentally safe as compared to the toxic cyanide system for gold extraction. In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore samples from two different mines namely Akeshi and Hishikari of Japan. In this study, the effect of thiosulphate concentration, effect of ammonia, effect of cupric ions, and few other variables

    Details >
  • Gold Recovery from Nickel Catalyzed Ammonium

    Copper catalyzed ammonium thiosulfate leaching process has been proposed as an alternative gold extraction process to cyanidation. In order to recover gold from the ammonium thiosulfate solution, ion exchange process has been proposed as a gold recovery method using strongly basic anion exchange resin. However, the co-adsorption of copper along with gold causes difficulty in separating gold

    Details >
  • Study on Gold Extraction from Thiosulfate-Ethylenediamine

    25/03/2020· Thiosulfate-ammonia-copper ion is the standard system for thiosulfate extraction of gold. This system is thoroughly studied in theory and practice, but the ammonia used in the process is toxic and volatile, so some scholars [3-5] Seeking a new system to replace the thiosulfate-ammonia-copper ion system. The thiosulfate-ethylenediamine-copper immersion gold system is a polyamine

    Details >
  • Gold Cementation from Ammonium Thiosulfate Solution by

    Ammonium thiosulfate leaching is an alternative gold ex-traction method to cyanidation because of its low toxicity.1–7) However, the gold recovery method from the leach solution was not widely studied. In our study of gold leaching,8) an optimum condition to extract gold from Hishikari ore was de-veloped. In this paper, the cementation method

    Details >
  • The treatment of copper–gold ores by ammonium

    01/10/2002· The effectiveness of low thiosulfate concentrations was confirmed by Cao et al. (1992), who studied the effects of the concentrations of thiosulfate, copper and ammonia on the extraction of gold and silver from a sulfide concentrate. Leaching was performed with a 0.2-M thiosulfate solution at 2-h retention time, which yielded 95% gold extraction. The sparge air was treated with ammonia in

    Details >
  • Separation of Gold from Other Metals in Thiosulfate

    23/10/2006· In the case of ammonium thiosulfate solutions, the percent extraction of gold is increased tremendously in comparison with other metals, and thus gold can be separated from them. The pH 50 of gold extraction for a mixed solvent of primary amine with amine oxide is about 9.0, which is very close to the pH of the actual leaching solutions. By

    Details >
  • 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 publicity for environmental reasons ; This process

    Details >
  • THIOSULPHATE LEACHING AN ALTERNATIVE TO CYANIDATION

    by resin-in-pulp gold extraction, has been developed by SGS to the point where it is a technically and economically viable 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

    Details >
  • Ammonium Thiosulfate For Gold In Situ Extraction Project

    Ammonium Thiosulfate For Gold In Situ Extraction Project Australia. We are a professional mechanical equipment manufacturer, we provide original parts, service solutions, extensive training and extensive wear, crushing chambers and screening media solutions to reduce operating costs, improve product quality and maximum productivity.

    Details >
  • Study on Gold Extraction from Thiosulfate-Ethylenediamine

    25/03/2020· Thiosulfate-ammonia-copper ion is the standard system for thiosulfate extraction of gold. This system is thoroughly studied in theory and practice, but the ammonia used in the process is toxic and volatile, so some scholars [3-5] Seeking a new system to replace the thiosulfate-ammonia-copper ion system. The thiosulfate-ethylenediamine-copper immersion gold system is a polyamine

    Details >
  • Gold Recovery from Nickel Catalyzed Ammonium

    Copper catalyzed ammonium thiosulfate leaching process has been proposed as an alternative gold extraction process to cyanidation. In order to recover gold from the ammonium thiosulfate solution, ion exchange process has been proposed as a gold recovery method using strongly basic anion exchange resin. However, the co-adsorption of copper along with gold causes difficulty in separating gold

    Details >
  • Separation of Gold from Other Metals in Thiosulfate

    15/02/2007· In the case of ammonium thiosulfate solutions, the percent extraction of gold is increased tremendously in comparison with other metals, and thus gold can be separated from them. The pH 50 of gold extraction for a mixed solvent of primary amine with amine oxide is about 9.0, which is very close to the pH of the actual leaching solutions. By

    Details >
  • The treatment of copper-gold ores by ammonium

    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

    Details >
  • Gold Recovery from Nickel Catalyzed Ammonium

    Copper catalyzed ammonium thiosulfate leaching process has been proposed as an alternative gold extraction process to cyanidation. In order to recover gold from the ammonium thiosulfate solution, ion exchange process has been proposed as a gold recovery method using strongly basic anion exchange resin. However, the co-adsorption of copper along with gold causes difficulty in separating gold

    Details >
  • Thiosulfate leaching of gold A review Request PDF

    05/10/2020· The cyanide-based solution was able to extract 88% of the gold, while sodium and ammonium thiosulfate extracted 70 and 75% of the gold, respectively. The electrowinning tests showed a 94% recovery

    Details >
  • US6632264B2 Gold recovery from thiosulfate leaching

    The ion exchange resin once loaded with gold and optionally copper is eluted with a mixture of sodium tetrathionate, ammonium thiosulfate and sodium sulfite. Gold and optionally copper are recovered from the eluate by electrowinning or precipitation. US6632264B2 Gold recovery from thiosulfate leaching Google Patents Gold recovery from thiosulfate leaching Download PDF Info Publication

    Details >
  • GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF

    In the sodium thiosulfate and ammonium thiosulfate tests, it was possible to extract 70 and 75% of the gold contained in the PCB, respectively, using solutions containing 0.12 M of sodium or ammonium thiosulfate, 0.2 M of ammonium and 20 mM of copper sulfate in 4 hours of leaching, at a temperature of 30(2(C and pH 10. The use of alternative leaching agents (sodium thiosulfate and ammonium

    Details >
  • Leach Gold using Hyposulphite Of Sodium AKA

    Thiosulfate Gold Extraction The fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold ores. The gold will dissolve only in small quantities. According to researchers, if gold leaf is treated for a time with sodium hyposulphite solutions

    Details >
  • The Extraction of Gold from E-waste by Hydrometallurgy

    The effects of copper sulfate and ammonium thiosulfate [(NH 4) 2 S 2 O 3], the environment PH, and pulp mass were analyzed. 56.7 % of gold was extracted in suitable and optimal conditions, which are in 0.1 molar thiosulfate, 40 ml copper sulfate, and 8 hours time. Gold extraction efficiency of PCBs in the range of PH = 10-10.5 may be attributed to the presence of thiosulfate stability and

    Details >

News & Cases

We provide quality and efficient solutions to our global customers