wo2013152424a1 chloride process for the leaching of gold

wo2013152424a1 chloride process for the leaching of gold

The invention relates to a method for leaching sulfide gold concentrate by virtue of combination of acid pressure leaching and alkali pressure leaching. The method comprises an acid pressure leaching pretreatment stage and an alkali pressure leaching stage firstly, in an acid pressure leaching process, reaction conditions are controlled, so that sulfides are oxidized, part of elemental sulfur ... A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90C and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent ...

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us patent for chloride process for the leaching of gold

us patent for chloride process for the leaching of gold

Aug 15, 2020 A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (10 m) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21%. The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory The ammonia-cyanidation leaching process proved to have no significant effect on the suppression of copper in the gravity gold concentrate and obtained gold recoveries less than those obtained in intensive cyanidation.The kinetic study on the intensive cyanidation of the gravity concentrate showed that at lower levels of cyanide and higher ...

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study on the gold leaching process by potassium

study on the gold leaching process by potassium

sparked interest in the potential application of cyanidation leaching either as a whole of ore process or as a bulk sulphide concentrate leach process for maximising gold recovery from this ore body. A concept engineering study was completed in June 2012 to assess the following processing options A whole of ore leach with SART for cyanide ... Mar 17, 2020 When considering the gold concentrate grade and gold recovery rate, the mixed gold flotation process and the flotation-roasting-cyanidation leaching process show ideal index for gold processing. However, the specific choice of process also needs to be comprehensively considered based on the nature of the ore and the investment in the gold ...

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cn104805281a method for leaching sulfide gold

cn104805281a method for leaching sulfide gold

Jul 21, 2019 A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. Mineralogical studies on the concentrate showed that very fine gold grains (10 m) were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21%. The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory May 16, 2017 The total gold leaching ratio of a refractory As-, S- and C-bearing gold concentrate calcine by direct cyanidation was only 70.2%, but there was a significant variation in the gold leaching ratio based on size fraction, in the following order medium size fraction (82.6%) coarse size fraction (72.3%) fine size fraction (59.7%).

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biooxidationthiosulfate leaching of refractory gold

biooxidationthiosulfate leaching of refractory gold

With a telluride-type gold ore flotation concentrate as the research object, the Na 2 S NaOH collaborative leaching process was applied to selectively separate tellurium before the cyanide leaching of gold and silver. The effects of process parameters including the type of leaching agent, the amount of leaching agent, liquid-solid ratio, leaching temperature, and leaching time on the ... gold processing - gold processing - Mining and concentrating The nature of the ore deposit determines the mining and mineral processing techniques applied. Oxide ore deposits are frequently of such low grade (e.g., 3 to 10 parts per million) that extensive mineral processing cannot economically be justified. In this case they are merely shattered by explosives and then piled into heaps for ...

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the intensive leaching of gold concentrates containing

the intensive leaching of gold concentrates containing

recovery of platinum, palladium, and gold from stillwater complex flot ation concentrate by a roastingleaching procedure by e. g. bdglin, 1 j. m. gomes, 2 t. g. carnahan,2and j. m. snider3 abstract The patented Albion Oxidation Process is a processing technology that permits the extraction of precious metals from refractory ore by the conventional cyanideinleach (CIL) process. Most sulphide ores can not be leached at acceptable rates at atmospheric pressure. Feed to the Albion Process is in the form of a sulphide concentrate ...

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guides for highsulfide gold processing

guides for highsulfide gold processing

Mar 25, 2021 With a telluride-type gold ore flotation concentrate as the research object, the Na 2 S NaOH collaborative leaching process was applied to selectively separate tellurium before the cyanide leaching of gold and silver. The effects of process parameters including the type of leaching agent, the amount of leaching agent, liquid-solid ratio, leaching temperature, and leaching time on the ... Aug 15, 2021 The investigation shows that the presented cyanide-free leaching approach can address the refractory nature of gold concentrates in atmospheric pressure - the simultaneous oxidation of sulfide minerals and gold in a single unit process providing new horizons for the future of the utilization of refractory gold ores.

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minerals free fulltext improvement of gold leaching

minerals free fulltext improvement of gold leaching

A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90C and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent ... The ammonia-cyanidation leaching process proved to have no significant effect on the suppression of copper in the gravity gold concentrate and obtained gold recoveries less than those obtained in intensive cyanidation.The kinetic study on the intensive cyanidation of the gravity concentrate showed that at lower levels of cyanide and higher ...

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process for leaching of precious metals degussa

process for leaching of precious metals degussa

The invention relates to a method for leaching sulfide gold concentrate by virtue of combination of acid pressure leaching and alkali pressure leaching. The method comprises an acid pressure leaching pretreatment stage and an alkali pressure leaching stage firstly, in an acid pressure leaching process, reaction conditions are controlled, so that sulfides are oxidized, part of elemental sulfur ... Oct 06, 1992 A process is disclosed for the leaching of gold and silver from ores and ore concentrates through intimate contact of the ore or ore concentrate with an aqueous leach solution containing cyanide. The leach solution has a pH of 8 to 13. The leaching process takes place in the presence of an oxygen-releasing peroxo compound.

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improvement of gold leaching from a refractory gold

improvement of gold leaching from a refractory gold

Apr 28, 2020 The leaching efficiencies of metal ions (As, Cu, Zn, Fe, and Pb) and recovery of gold from refractory gold concentrate were investigated via nitric acid leaching followed by It is indicated in Table1that the gold concentrate had a high content of S (20.76%), As (1.62%) and C (6.95%), which are all possibly detrimental to gold leaching. Specically, according to the chemical phase analyses of gold in the concentrate (see Table2), the gold concentrate belongs to a refractory

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gold processing equipment process flow cases jxsc

gold processing equipment process flow cases jxsc

Aug 15, 2021 The investigation shows that the presented cyanide-free leaching approach can address the refractory nature of gold concentrates in atmospheric pressure - the simultaneous oxidation of sulfide minerals and gold in a single unit process providing new horizons for the future of the utilization of refractory gold ores. This paper deals with gold extraction from a refractory concentrate by chlorine leaching. The process considers a pre-treatment of refractory materials by low temperature oxidation carried out ...

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doc outotec copper chloride leaching process for

doc outotec copper chloride leaching process for

The Resources Intensive Cyanidation Reactor can fully isolate the current reaction tank. This guarantees that high grade concentrate cannot short circuit the gold cyanidation process. Optimal Leach Performance A Resources Intensive Leach Reactor System insures complete and Whilst the installation is similar to that used for pre-oxidation or Aachen assisted leaching in the Leachox process the flotation concentrate is pumped through the reactor multiple times perhaps as many as 30 passes in contrast to 1-2 passes for the pre-oxidation role .Depending upon the mineralogy ultrafine grinding of the flotation concentrate may be required prior to cyanidation

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recovering gold from copper concentrate via the

recovering gold from copper concentrate via the

Aug 22, 2019 Coarse gold concentrates are available in the process, so the gravity separation process directly affects the results of the entire placer gold beneficiation. Concentration. According to different types of alluvial gold mines, gravity separation amalgamation, etc. can be used to further increase the gold concentrate content. Mar 25, 2021 With a telluride-type gold ore flotation concentrate as the research object, the Na2S NaOH collaborative leaching process was applied to selectively separate tellurium before the cyanide leaching of gold and silver. The effects of process parameters including the type of leaching agent, the amount of leaching agent, liquid-solid ratio, leaching temperature, and leaching time on the

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gold recovery from gold copper concentrates using

gold recovery from gold copper concentrates using

Outotec Copper Chloride Leaching Process utilizes mixed chloride sulphate media in atmospheric leaching conditions to extract copper, silver and gold from copper concentrate.The leaching solution is purified with solvent extraction and copper is recovered Nov 16, 2020 Chemical Leaching. Chemical leaching makes use of the chemical properties of gold to leach it from ore, concentrate, or tailings. This process is mostly used in large scale mining operations but has been increasingly adopted in small scale mining because of

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4 reasons and solutions of poor gold leaching effect

4 reasons and solutions of poor gold leaching effect

The leaching of gold in the Pyhsalmi copper concentrate was signi cantly slower than in the other concentrate therefore, the mode of occurrence of gold in the Pyhsalmi concentrate was studied in more detail. About 20% of the gold in the copper concentrate is gravitative recoverable, as shown by Knelson preconcentration tests resulting gold copper gravity concentrates. This process makes it possible to improve recoveries and reduce costs in gold copper deposits where gravity concentration can recover a significant fraction of the contained gold or copper prior to further processing by CIP or flotation. The process involves leaching

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leaching of copper concentrates

leaching of copper concentrates

Mar 29, 2019 Gold cyanidation process refers to a kind of gold extraction process that adopting cyanide as the leaching liquid to extract gold, which is the main modern method of extracting gold from ore or concentrate. Gold cyanidation process mainly include cyanide leaching, washing and filtration of leaching pulp, gold extraction from cyanide liquid or ... Apr 08, 2013 A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90 C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent ...

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the selective leaching of copper from a goldcopper

the selective leaching of copper from a goldcopper

Jun 22, 2020 For the gold ore or concentrate with high arsenic content and high gold grade, the roasting method is mostly used. The roasting process includes oxidation roasting and solidification roasting. The aim is to expose the wrapped gold sufficiently to increase the The method according to claim 1 wherein the method further comprises leaching the deposited gold concentrate, prior to said reducing leach step, in an aqueous liquor comprising one or more agents selected from the group consisting of hydrochloric acid, nitric acid, alkali, lead acetate, chelating agents, carboxylic acids and their salts ...

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cyanide gold extraction process jxsc machine

cyanide gold extraction process jxsc machine

The analysis of gold content in concentrate sample us- ... and cyanide leach. The selection of suitable sample preparation is highly depends on the gold concentration and the further method to nal determination. ... container that is used to process gold cupellation process, so when process. Such concentrates have to be oxidized to liberate the gold, and incorporation of the PlatsolTM process means that, while the sulphides are oxidisng, the gold is leaching, at minimal incremental cost, and in a non-cyanide lixiviant. PROCESS ChEMISTRY The most important leaching reactions taking place in the autoclave are

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selective preleaching of tellurium from telluridetype

selective preleaching of tellurium from telluridetype

The effect of several process variables for a chal- , copyrite concentrate are presented. Temperature is the most economically significant. While high single-stage copper recoveries can be made in the leach, the economic necessity of limiting oxidation of sulfur suggests that a multi-stage leach procedure recovering about 50 per cent per ternative process would be useful for recovering both copper and gold from such a low-grade concentrate. Cyanideammonia leaching of Telfer otation tailings has been carried out by Muir et al. (1991) for 24 h with 0.3 M NH 3/0.1 M (NH 4) 2SO 4. This process extracted 82% Cu and no gold, followed by subsequent cyanidation of the washed leach

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gold processing mining and concentrating britannica

gold processing mining and concentrating britannica

The traditional gold leaching method is cyanidation, which carries serious security and environmental problems. More and more attention is paid to the research on non-cyanide process. A high-arsenic-and-sulphur refractory gold concentrate in Sichuan was taken as the object of study. After the roasting-oxidation pretreatment of the sample, potassium ferricyanide was adopted to carry on the ... The oxidative leach can be operated under a range of pH conditions, varying from acidic to neutral. For the processing of a refractory gold/silver concentrate, the pH of the oxidative leach is held at 5.5 by the continual addition of limestone slurry to ensure complete oxidation of the sulphur to sulphate.

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