ammonium polysulfide gold extraction

  • A Method for Leaching or Dissolving Gold from Ores or

    lurgical gold extraction routes utilize a based on the selective and fast dissolu tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious Metal Scrap Nicolas Geoffroy and Fran231;ois Cardarelli 4Au0 + 8 ous solutions of ammonium thiosulfate6 according to the overall reaction scheme given in

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  • The dissolution of gold colloids in aqueous thiosulfate

    The dissolution of gold by oxidation with copper(II) in oxygen free solutions appears to be a result of the reaction between gold, thiosulfate ions and the mixed complex Cu(NH3)p(S2O3)0.

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  • Refining Community 187; Topic Ammoniun Polysulfide Injection

    Apr 25, 20160183;32;Below about 38186;F, ammonium polysulfide, tends to salt out of the concentrated solution (storage tank) The temperature at and downstream of the polysulfide injection point should be not exceed 230186;F. If the polysulfide solution is flashed above about 230186;F, polysulfide will decompose to H2S and elemental sulphur.

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  • Sodium thiosulfate

    Ammonium thiosulfate is typically preferred to sodium thiosulfate for this application. Gold extraction. Sodium thiosulfate and ammonium thiosulfate area component of an alternative lixiviants to cyanide for extraction of gold. Thiosulfate forms strong soluble complexes with gold(I) ions, [Au(S 2

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  • Treatment of a Polysulphide Ore by Ammoniacal Thiosulfate

    trioctyl methyl ammonium chloride (Aliquat) which does not need a pH adjustment for its use in solvent extraction process [10]. The problem of this technique lies on the extraction of gold from the organic phase for further gold recovery. Gold electrodeposition from ammoniacal thiosulfate solutions, by application of a direct current, presents

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  • Thiosulfate leaching of goldA review, Minerals

    Extraction of gold from a gold ore by ammonium thiosulphate leaching Kim, S.K; Sohn, Y.S Gold pyrite association result of oxysulfide and polysulfide transport of gold

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  • BACKGROUND NOTE ON CYANIDE IN GOLD MINING

    BACKGROUND NOTE ON CYANIDE IN GOLD MINING thiourea, polysulfide, ammonia and ammonium copper cyanide38, chlorine, bromine and iodine. Many alternative lixiviants are however more hazardous and persistent than cyanide EUROSTAT study on the impacts of gold extraction

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  • Kinetics and Mechanism of Gold and Silver Dissolution In

    More recently Kakovskii and Tyurin (1962) showed that ammonium polysulfide (NHtf)2Sx is also a good solvent for gold. None of these reagents, however, is used in commercial practice yet. The present review deals mainly with the theoretical aspects of cyanidation; no attempt was made to cover papers describing operation of cyanide mills.

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  • Solvent Extraction of Gold(I) from Alkaline Cyanide

    Separation Science and Technology Volume 48, 2013 H.Q. ( 2006) Solvent extraction of gold from polysulfide solution. Hydrometallurgy, 82 144. Jiang , also can be extracted by water soluble quaternary ammonium salt such as CTAB with assistance of TBP

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  • Thiosulfate Leaching of Gold a Review Redox

    R. Importance of solution chemistry for thiosulfate leaching of gold. Aghamirian. Behaviour of gold and silver in oxidising zine of sulfide deposit Izu. Zhang W and Li Y.K. 72 76 Thomas. Gold extraction from mild refractory ore using ammonium thiosulfate.. Cambridge. Nonferrous Metals (China).736. Inc. Zhao. 2.

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  • ammonium polysulfide gold extraction mountainboards

    ammonium polysulfide gold extraction US5114687A Ammonia extraction of gold and silver from ores and The process is particularly effective for refractory gold ores including sulfide and to extract gold and silver from various ores or ot

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  • Tools for Mining Small Complex Gold Deposits ecropa

    Action area n176; I.3 Innovative extraction of raw materials 2) Mining of small deposits Objectives of the commitment The main objective is to increase transnational cooperation to develop best practice for mining small mineral deposits. The focus will be on known gold

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  • Sodium Thiosulfate Formula Sodium Thiosulfate Uses

    Apart from its medical uses, it also has applications in water treatment, neutralizing bleach, leather tanning, gold extraction, photographic processing, and chemical heating pads. Health effects/safety hazards Sodium thiosulfate is not a toxic material and is used for medical purposes.

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  • Solvent extraction of gold(III) by

    Recently, the solvent extraction technique for the recovery of gold from chloride solutions using amines and other types of extractants has received some attention.15 In the case of gold extraction in chloride media using amines as extractants, the observed extraction order is quaternary ammonium salt gt; tertiary amine gt; secondary amine

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  • Process for removing and recovering copper, silver and

    Mar 02, 19990183;32;Process for removing and recovering copper, silver and zinc from sulfide ores The present invention relates to a process for removing and recovering copper, silver and zinc from sulfide ores, more particularly, those bearing gold. it is not a common practice in the gold extraction industry to implement significant efforts in

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  • TUESDAY, AUGUST 23, 2005, P.M. MetSoc of CIM

    Carbonaceous gold ores are particularly attractive for leaching by ammonium thiosulfate as the gold thiosulfate Gold extraction from the ore using 0.55 M NaSH, 4.1 atm (60 PSI) Polysulfide complexes of gold are also likely to be formed, and may contribute substantially to gold leaching.

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  • Noble Metal Recovered As Free Metal Patents and Patent

    After a liquid/solids separation step, the solution obtained is subjected to an organic solvent extraction step using an oxime to obtain a solution of organic solvent containing gold, which is stripped with sodium thiosulphate to recover gold. The extraction may be operated to extract gold with or without iron.

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  • DEPARTMENT OF DEFENCE

    differences between these two common polysulfide curing agents it is essential to understand the chemistry of the curing process. The curing (polymerization) process involves the oxidation of the terminal thiol groups in the polysulfide prepolymers to form the corresponding disulfide.

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  • AMMONIUM POLYSULFIDE, SOLUTION CAMEO Chemicals NOAA

    AMMONIUM POLYSULFIDE SOLUTION is a strongly alkaline aqueous solution. Reacts with acids to generate toxic gaseous hydrogen sulfide. Reacts with bases to release gaseous ammonia. May react vigorously with oxidizing agents, including inorganic oxoacids, organic peroxides and epoxides.

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  • Solvent extraction of gold from polysulfide solution

    Gold extraction with N 1923 and TBP from sodium polysulfide solution was also studied and the conclusions are analogous. The effect of using ammonium polysulfide is interesting and shows greater extraction than sodium polysulfide at lt; pH 9.5 but lower extraction at gt; pH 9.5.

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  • US4369061A Recovery of precious metals from difficult

    Precious metals such as gold and silver are recovered from difficult to treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.0, and at least 0.05% sulfite ion, sulfite and thiosulfate requirements being maintained by the reaction in situ of sulfur dioxide and

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  • Ammonium sulfide Revolvy

    Ammonium sulfide , also known as diammonium sulfide , is an unstable salt with the formula (NH)S. Aqueous solutions purporting to contain this salt are commercially available. With a pK exceeding 15, the hydrosulfide ion cannot be deprotonated to an appreciable amount by ammonia .

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  • Right to Know Hazardous Substance Fact Sheet

    f Inhaling Ammonium Polysulfide can irritate the nose, throat and lungs. f Exposure to Ammonium Polysulfide can cause headache, dizziness, nausea and vomiting. f Ammonium Polysulfide can release Hydrogen Sulfide Consult the Right to Know Hazardous Substance Fact Sheet on HYDROGEN SULFIDE. f Ammonium Polysulfide is a DOT CORROSIVE material.

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  • (PDF) Alkaline Sulfide Gold Leaching Kinetics ResearchGate

    Also, in some gold bearing ores and concentrates, conventional cyanide leaching is not the best method for gold extraction due to the presence of cyanicides or pregrobbing carbon such as found in

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  • The study of the kinetics of gold leaching in the ammonium

    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.

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  • US5876588A Process for removing and recovering copper

    Ores containing copper, zinc, silver in the form of sulfides are treated by a solution of sulfurated sulfite ions and ammonium ions in order to remove most of the metals from the sulfide ores. This treatment renders the resulting gold bearing ores much more amenable to cyanide extraction. Dissolved metals are reclaimed by appropriate techniques, such as electrowinning or liquid liquid

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  • Reagents Test Solutions (TS) uspbpep

    Ammonium Polysulfide TS Yellow liquid, Gold Chloride TS Dissolve 1 g of gold chloride in 35 mL of water. Litmus TS Digest 25 g of powdered litmus with three successive 100 mL portions of boiling alcohol, continuing each extraction for about 1 hour. Filter, wash with alcohol, and discard the alcohol filtrate.

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  • Method for thiosulfate leaching of precious metal

    Jun 27, 20060183;32;Using gold as an example, the thiosulfate leaching of precious metal bearing material in the absence or substantial absence of copper and ammonia under elevated oxygen partial pressure can be illustrated by the following reaction

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  • Screening of Non cyanide Leaching Reagents for Gold

    A direct gold extraction from WEEE by selective leaching and precipitation would have many advantages. Due to raising social awareness of the ecological impacts of cyanidic gold extraction and environmental specifications, cyanide cannot be used as gold extractant in modern processes.

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  • Alkaline sulfide gold leaching kinetics ScienceDirect

    1. Introduction. The recovery of gold from ores is a hydrometallurgical process, with cyanidation being the dominant means of recovering gold for over 125 years.The popularity of cyanide can be attributed to the simplicity and selectivity of the extraction process.

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  • extraction gold using chemical mountainboards

    Environmentally Benign, Rapid, and Selective Extraction of Gold . Jun 14, 2017 The extraction of gold from ores and electronic waste is an important a new, lowtoxicity gold extraction chemistry using a combination of. Artisanal and Small Scale Gold Mining Without Mercury EPA

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  • Sodium thiosulfate Sciencemadness Wiki

    Sodium thiosulfate is an inorganic compound with the chemical formula Na 2 S 2 O 3, widely used in titrations and as cyanide poisoning antidote.The most common form of this salt is the pentahydrate Na 2 S 2 O 3 183;5H 2 O.This solid is slightly efflorescent.

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  • Sodium thiosulfate

    Ammonium thiosulfate is typically preferred to sodium thiosulfate for this application. Gold extraction. Sodium thiosulfate and ammonium thiosulfate area component of an alternative lixiviants to cyanide for extraction of gold. Thiosulfate forms strong soluble complexes with gold(I) ions, [Au(S 2 O 3) 2] 3.

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  • Solvent extraction of gold from polysulfide solution

    The extraction of Au(I) from a polysulfide solution with TBP, amine alkyl extractants and their mixture was studied. The results show that Au(I) could be extracted with TBP or amine alkyl

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  • Process for wastewater treatment Radian Corporation

    Apr 12, 19880183;32;Process for wastewater treatment . spent liquors are spent cyanide solutions from electroplating and metal finishing shops and barren bleed solutions from gold and silver extraction operations. Cyanide containing waste scrub gases are produced in fluid catalytic cracking processes. e.g., as sodium polysulfide or potassium

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  • Cyanide Treatment with Hydrogen Peroxide USP Technologies

    While hydrogen peroxide will oxidize free cyanide, it is common to catalyze the reaction with a transition metal such as soluble copper, vanadium, tungsten or silver in concentrations of 5 to 50 mg/L (2). steryldimethylbenzyl ammonium chloride is added to precipitate ferrocyanide. Finally, ferric sulfate is added as a sweep floc to

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  • Mineral Processing and Extractive Metallurgy Review

    Mineral Processing and Extractive Metallurgy Review, 7 , pp. 115 135. [Taylor amp; Francis Online] [Google Scholar]), and Haque (1987 Haque , K. E., 1987, Gold leaching from refractory oresLiterature survey. Mineral Processing and Extractive Metallurgy Review, 2 , pp. 235 253.

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  • US Patent for Recovery of precious metals from difficult

    This patent proposes the use of ammonium thiosulfate as a secondary leach for the recovery of silver and gold, in conjunction with a hydrometallurgical process for the recovery of copper from the copper bearing sulfidic ore. FIG. 3 of this patent shows a flow diagram for the extraction of precious metals from chalcopyrite concentrate before the

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