gold dissolution from ores and recovery systems

  • Process Flow-Sheet for Gold and Antimony Recovery from …

    Recovery of gold from refractory ores requires a pretreatment to liberate the gold particles from the host mineral. In particular, in the case of stibnite (Sb2S3), the antimony (Sb) forms stable...

  • US5114687A

    Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia, ammonium salts and one or more oxidants. The process is particularly effective for refractory gold ores including sulfide ...

  • Recovery Refractory Resources

    As a result, refractory ores require physical or chemical pre-treatment for adequate gold recovery to be achieved through traditional cyanidation and carbon adsorption processes. Pyrite and arsenopyrite are the most common host minerals in refractory gold deposits.

  • Treatment of copper-rich gold ore by cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching

    noted that copper sulphide bearing gold ores yielded poor gold extraction and demanded high reagent dosages for their treatment. MUIR et al [8] reported that the ammoniacal cyanide leaching was an effective system for the recovery of gold from a copper-rich(1.2

  • WO1991013177A1

    A process for the hydrometallurgical recovery of gold from gold-bearing material comprising the step of treating gold-bearing material with an acidic lixiviant solution containing thiourea and ferric ions, characterized in that the said solution also includes a complexing ...

  • INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF GOLD AND SILVER FROM TURKISH GOLD ORES

    Influence of lead nitrate on cyanide leaching of gold and silver from Turkish gold ores 509 similar effect inhibiting partially the formation of sulfur layer. However, in the case of chalcopyrite this mechanism is not observed (Deschenes et al., 2000). On the other hand

  • Minerals | Free Full-Text | Effect of Particle Size and …

    The recovery of gold by ore leaching is influenced by the size of the particles and the chemical environment. The effect of particle size on the dissolution of gold is usually studied using mono-size particles as the gold in solution comes from the ore of a unique leached particle size. This paper proposes a method to estimate the gold dissolution as a function of particle size using a bulk ...

  • The leaching of gold, silver and their alloys in alkaline glycine …

    from ores, the dissolution of gold was done by occurred via gold-oxidising (peroxides) and a mixture of gold complexing (amino acids) agents secreted by the bacteria. Some of the identified micro-bacterial synthesised amino acids are asparagine, glycine, aspartic

  • (PDF) Thermochemistry of thiocyanate systems for leaching …

    The mechanism of dissolution of gold by iron(III)-thiocyanate solutions is directly linked with the autoreduction process, in which FeIII is spontaneously reduced to FeII while oxidizing SCN- This ...

  • US4337226A

    The residue is then leached with a solution comprising sulfuric acid and NaOCl or H 2 O 2 to extract platinum, palladium, copper and gold. Metal values are recovered from ore concentrates by means of dry grinding, followed by a two-stage leaching process in which the ground concentrate is first leached with sulfuric acid at a temperature of about 90° to 100° C. to selectively leach nickel and iron.

  • Environmentally Benign, Rapid, and Selective Extraction …

    The extraction of gold from ores and electronic waste is an important topic worldwide, as this precious metal has immense value in a variety of fields. However, serious environmental pollution and high energy consumption due to the use of toxic oxidation reagents and harsh reaction conditions is a well‐known problem in the gold industry.

  • Gold Extraction & Recovery Processes

     · Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly ...

  • Environmentally Benign, Rapid, and Selective Extraction …

    The extraction of gold from ores and electronic waste is an important topic worldwide, as this precious metal has immense value in a variety of fields. However, serious environmental pollution and high energy consumption due to the use of toxic oxidation reagents and harsh reaction conditions is a well‐known problem in the gold industry.

  • Refractory Gold Ore Treatment Methods

    Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and …

  • [PDF] Gold Extraction and Recovery Processes for Internal …

    Various methods such as gravity concentration, flotation, panning, pyrometallurgy, cyanidation etc are available for the extraction of gold metal from its ores. Amongst these methods, cyanidation is the most common method used in the leaching of gold from the ore. This process involves the dissolution of gold containing ores in dilute cyanide solution in the presence of lime and oxygen. For ...

  • Recovery of gold from secondary sources—A review

     · There are two main areas of bio-hydrometallurgy for recovery of gold, namely bio-oxidation and bio-sorption. Bio-oxidation has been successfully applied in recovery of gold from metallic sulfides, which are the major bearing minerals of gold, and spent electronic materials, by the use of bacterially assisted reactions.

  • Cyanidation of Gold Ores | SpringerLink

    Abstract Alchemists—driven by greed and curiosity—did not manage to produce gold from cheap materials, but they certainly initiated and advanced chemical knowledge. The discovery of aqua regia by the Arab alchemist Jabir Ibn Hayyan in the sixth century introduced a chemical technology for the extraction of gold from its ores.

  • US5114687A

    Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia, ammonium salts and one or more oxidants. The process is particularly effective for refractory gold ores including sulfide ...

  • The Metallurgy of Cyanide Gold Leaching – An …

    Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates. Despite the difficulties and hazards of working with cyanide, no other process has yet been proven to be an economic viable alternative.

  • (PDF) Heap leaching as a key technology for recovery of …

    Heap leaching technology is finding increasingly widespread application to recover values from low-grade ores, especially in the gold and copper industry. The particular attractiveness of the process is the relatively low-cost recovery of the target

  • HYDROMETALLURGY OF GOLD: NEW PERSPECTIVES AND TREATMENT OF REFRACTORY SULPHIDE ORES

    electrowinning for the recovery of gold from low grade ores has been attempted. Several projects have been conducted with the aim of developing an extractant which would extract gold from typical cyanide solutions (Fleming 1992; Alguacil et al. 1994,

  • The leaching of gold, silver and their alloys in alkaline glycine …

    from ores, the dissolution of gold was done by occurred via gold-oxidising (peroxides) and a mixture of gold complexing (amino acids) agents secreted by the bacteria. Some of the identified micro-bacterial synthesised amino acids are asparagine, glycine, aspartic

  • US4557759A

    Gold is subsequently recovered on activated charcoal. The excess iodide formed during the process is reoxidized to iodine electrochemically in a special diaphragm cell to regenerate the lixiviant. A process for the hydrometallurgical recovery of gold from materials containing gold comprising leaching the materials with a lixiviant containing iodine.

  • Minerals | Free Full-Text | A New Direction for Biomining: …

    Recovery of metals during reductive dissolution of laterite by At. ferrooxidans based on X-ray fluorescence (XRF) analysis and dissolution by aqua regia of samples of ore before and after leaching. These are compared with recovery values determined by metal concentration in the leach liquor, which are based on the elemental composition of the laterite determined by BHP Billiton (nd, not ...

  • Gold extraction from paleochannel ores using an aerated alkaline …

    1 Gold extraction from paleochannel ores using an aerated alkaline glycine lixiviant for consideration in heap and in-situ leaching applications E.A. Oraby a,c, J.J. Eksteen a *, A. Karrech b, M. Attar b a Facultyof Science and Engineering, Western Australian

  • Gold Dissolution from Ore with Iodide-Oxidising …

     · The dissolution rate of gold is directly proportional to the concentrations of iodine and iodide, unaffected by a change in pH between 2 and 10 9,10, in contrast to gold cyanidation, which is ...

  • (PDF) Gold dissolution in non-ammoniacal thiosulphate …

    The dissolution rate of gold in the alkaline oxygen-thiosulfate system is dramatically lower than that of conventional copper catalyzed ammonia-thiosulfate and cyanide systems (Zhang and Nicol, 2003

  • Gold Dissolution from Ore with Iodide-Oxidising Bacteria

    Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly composed of gold, pyrite, galena, and chalcopyrite. Eight bacterial strains ...

  • Gold extraction from paleochannel ores using an aerated alkaline …

    1 Gold extraction from paleochannel ores using an aerated alkaline glycine lixiviant for consideration in heap and in-situ leaching applications E.A. Oraby a,c, J.J. Eksteen a *, A. Karrech b, M. Attar b a Facultyof Science and Engineering, Western Australian

  • Gold Dissolution from Ore with Iodide-Oxidising Bacteria

    Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly composed of gold, pyrite, galena, and chalcopyrite. Eight bacterial strains ...

  • Biomining—biotechnologies for extracting and recovering metals from ores …

    that utilize biological systems (chiefly prokaryotic microorganisms) to facilitate the extraction and recovery of Occasionally metals from ores and waste materials [1,2–9]. the term is used synonymously with bio-leaching, though strictly the latter refers to where ...

  • (PDF) Gold Extraction and Recovery Processes For Internal …

    The gold laden pregnant solution drains out from the bottom of the pile and is collected for gold recovery by either carbon adsorption or zinc precipitation. The barren solution is then recycled to the pile. Heap leaching generally requires 60 to 90 days for processing ore that could be leached in 24 hours in a conventional agitated leach process.

  • RECOVERY OF GOLD FROM ORES

    Furthermore, the reagents were not effective in destroying refractory materials in the ores and were, therefore, inefficient in dissolution of the gold. As a result, roasting prior to extraction was often necessary to obtain satisfactory gold recovery.

  • Gold dissolution and copper suppression during leaching …

     · However, the treatment of sulfide ores gave poor gold recovery and required higher reagent concentrations (). It was also found that, due to the loss of volatile ammonia, a significant loss of gold and cyanide was observed due to the precipitation of gold as AuCN⋅CuCN ( Muir et al., 1991, …

  • (PDF) Gold Extraction and Recovery Processes For …

    Gold Extraction and Recovery Processes Wong Wai Leong Amongst these methods, cyanidation is the most common method used in the leaching of gold from the ore. This process involves the dissolution of gold containing ores in dilute cyanide solution in the presence of lime and oxygen.

  • RECOVERY OF GOLD FROM ORES

    Furthermore, the reagents were not effective in destroying refractory materials in the ores and were, therefore, inefficient in dissolution of the gold. As a result, roasting prior to extraction was often necessary to obtain satisfactory gold recovery.

  • [PDF] Gold Extraction and Recovery Processes for Internal …

    Various methods such as gravity concentration, flotation, panning, pyrometallurgy, cyanidation etc are available for the extraction of gold metal from its ores. Amongst these methods, cyanidation is the most common method used in the leaching of gold from the ore. This process involves the dissolution of gold containing ores in dilute cyanide solution in the presence of lime and oxygen. For ...

  • Gold cyanidation

    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 is the most commonly used leaching process for gold extraction. ...

  • Recovery Refractory Resources

    gold recovery from refractory ores has received an increased amount of attention" 148,150,153,155,156,158,160MM1209 dd 148 21/08/2012 10:02 use of Earth''s natural resources ...

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