gold chlorination process

gold chlorination process

Gold Chlorination Processes & Methods

2016-8-31 · Chlorination Process for Gold. This process was based on the fact that chlorine, in the presence of moisture, converts gold into the trichloride AuCl3 , which is soluble in water and removed by washing, the gold being then precipitated by ferrous sulphate, sulphur dioxide, hydrogen sulphide, or charcoal. Coarse gold requires long contact and ...

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Chlorination process for recovering gold values from gold ...

A process for the recovery of precious metal values as essentially pure gold from gold alloys in the form of thin strips 0.05 to 0.25 inch thick having a gold content of up to 80% gold comprising chlorinating the strips at a temperature of 300 to 700 degrees Centigrade to form a metallic gold/metal chloride mixture and removing the metal chlorides from the gold in the mixture

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Gold Chlorination Process in VAT - 911 Metallurgist

2016-10-31 · Metallurgical ContentThe Munktell Chlorination ProcessThe Cassel-Hinman Bromine ProcessPermanganate Chlorination ProcessChlorination The

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Gold extraction by chlorination using a pyrometallurgical ...

2009-3-1 · Dunn, 1982, Dunn et al., 1991 have extracted gold by chlorination using pyrometallurgical processes at temperatures lower than the ones mentioned above, from refractory minerals and alloys, with a previous roasting process. The objective of this research was, on one hand, to study gold extraction from an alluvial material, through a ...

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Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3 · Technical Note Gold extraction by chlorination using a pyrometallurgical process M.W. Ojedaa,*, E. Perinob, M. del C. Ruiza a Instituto de Investigaciones en Tecnología Química (INTEQUI), Universidad Nacional de San Luis-CONICET, C.C. 290, 5700 San Luis, Argentina bÁrea de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina ...

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Study of Gold Leaching Behavior in the Chlorination

2021-1-11 · This reveals that the leaching behavior of gold in the chlorination process is the key to improve the gold leaching rate. Hence, the leaching behaviors of gold at different concentrations of NaClO 3, NaCl, and H 2 SO 4 were evaluated in this study.

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Chloride as an Alternative to Cyanide - SGS

Chlorination was the most popular process to extract gold, before it was rendered obsolete with the advent of the cyanidation process at the turn of the last century, not least because it required the use of potentially

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Extraction of Gold

Plattner's Chlorination-process As a preliminary step the material is submitted to an oxidizing and chlorinating roasting, to convert metals other than gold into chlorides. After chlorination of the gold, preferably with chlorine under pressure, the metal is precipitated by hydrogen sulphide or ferrous sulphate, or the gold is precipitated by ...

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(PDF) Investigation on the recovery of gold from ...

2019-12-26 · Investigation on the recovery of gold from pretreated cyanide tailings using chlorination leaching process December 2019 Separation Science and Technology 56(2):1-9

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Gold Ore - an overview | ScienceDirect Topics

Alloys containing a relatively high percentage of gold undergo prerefining by chlorination in the ‘Miller process’, in which the metal is melted in clay-lined crucibles and chlorine gas is passed into the melt. Silver and base metals are converted to their chlorides, which are either volatilized or removed from the surface of the molten gold.

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Gold extraction by chlorination using a pyrometallurgical ...

2009-3-1 · Dunn, 1982, Dunn et al., 1991 have extracted gold by chlorination using pyrometallurgical processes at temperatures lower than the ones mentioned above, from refractory minerals and alloys, with a previous roasting process. The objective of this research was, on one hand, to study gold extraction from an alluvial material, through a ...

Read More
Study of Gold Leaching Behavior in the Chlorination

2021-1-11 · This reveals that the leaching behavior of gold in the chlorination process is the key to improve the gold leaching rate. Hence, the leaching behaviors of gold at different concentrations of NaClO 3, NaCl, and H 2 SO 4 were evaluated in this study.

Read More
Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3 · recover gold from alluvial materials by an alternative process such as chlorination, preventing environmental pollution problems gen-erated by gold extraction and concentration by other conventional methods. Extractions of gold close to 99% were achieved, at a temperature of 873 K and at a reaction time of 5400 s, with no significant attack

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Investigation on the recovery of gold and silver from ...

2018-9-30 · In this work, a new chlorination roasting process for the extraction of precious metals (gold and silver) from the CT was attempted. Chlorination process, harness the feature of low boiling point and high volatile of metal chlorides. It demonstrates that CaCl 2, as a chlorination reagent, effectively break small particles and release gold . It ...

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Thermodynamic analysis of gold telluride chlorination ...

Optimal condition of gold chlorination leaching in thermodynamics was 3.5~7.8 of pH value, above 0.9 V of oxidation potential, above 1 mol·L -1 of concentration of chloride and 1×10 -5~1×10 -4 ...

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The Extraction of Gold by Amalgamation and Chlorination

2019-10-31 · amalgamation of gold with mercury and the use of the chlorination process in the extraction of gold from its ores.3 In her publication on colonial technology, Jan Todd criticised the slow acceptance of the chlorination process in Australia compared with the short time it took to utilise the process in South Africa and New Zealand, stating that ...

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Simultaneous extraction of gold and zinc from refractory ...

2020-4-23 · Abstract: A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of gold and zinc were investigated.

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US4353740A - Chlorine extraction of gold - Google Patents

A process for treating a particulated gold bearing ore to recover the gold therein is disclosed. The process includes roasting the ore to remove sulfides as sulfur dioxide followed by chlorination of the ore at a temperature of about 350° C. in the presence of iron to form a mixture of volatile gold chlorides and volatile gold-iron chlorides in the chlorine off gases followed by condensing ...

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Gold Refining Archives - Page 7 of 7 - Mineral Processing ...

2022-1-4 · Miller’s Gold Chlorination process was introduced by F.B. Miller. The refining process employs chlorine gas, which passed into molten gold covered with a layer of borax and silica, and reacts with most of metals present in the molten charge. Platinum group metals do not react. Basically, gold is slightly attacked in the first moments and .

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Recovery of gold from sulfide refractory gold ore ...

2021-11-28 · The thiourea leaching combined with pyrite enhanced chlorination roasting was first proposed to effectively extract gold from the second stage roasting slag, and the pyrite shown a great role in promoting gold extraction during chlorination roasting. In this process, gold could be effectively recovered from the sulfide refractory gold ore with ...

Read More
Gold extraction by chlorination using a pyrometallurgical ...

2009-3-1 · Dunn, 1982, Dunn et al., 1991 have extracted gold by chlorination using pyrometallurgical processes at temperatures lower than the ones mentioned above, from refractory minerals and alloys, with a previous roasting process. The objective of this research was, on one hand, to study gold extraction from an alluvial material, through a ...

Read More
Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3 · recover gold from alluvial materials by an alternative process such as chlorination, preventing environmental pollution problems gen-erated by gold extraction and concentration by other conventional methods. Extractions of gold close to 99% were achieved, at a temperature of 873 K and at a reaction time of 5400 s, with no significant attack

Read More
Investigation on the recovery of gold and silver from ...

2018-9-30 · In this work, a new chlorination roasting process for the extraction of precious metals (gold and silver) from the CT was attempted. Chlorination process, harness the feature of low boiling point and high volatile of metal chlorides. It demonstrates that CaCl 2, as a chlorination reagent, effectively break small particles and release gold . It ...

Read More
Thermodynamic analysis of gold telluride chlorination ...

Optimal condition of gold chlorination leaching in thermodynamics was 3.5~7.8 of pH value, above 0.9 V of oxidation potential, above 1 mol·L -1 of concentration of chloride and 1×10 -5~1×10 -4 ...

Read More
Simultaneous extraction of gold and zinc from refractory ...

2020-4-23 · Abstract: A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of gold and zinc were investigated.

Read More
The Extraction of Gold by Amalgamation and Chlorination

2019-10-31 · amalgamation of gold with mercury and the use of the chlorination process in the extraction of gold from its ores.3 In her publication on colonial technology, Jan Todd criticised the slow acceptance of the chlorination process in Australia compared with the short time it took to utilise the process in South Africa and New Zealand, stating that ...

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Metals | Free Full-Text | Gold Extraction from Cyanidation ...

2018-12-5 · During the roasting process, the chlorination reagent, CaCl 2 reacts with mineral components as well as the O 2 and H 2 O in the atmosphere . As a result, Cl 2 and HCl gas will generate/release, and chlorinate the gold. Due to the feature of low boiling point and high volatile of metal chlorides, the gold chloride volatilizes from the cyanide ...

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Refining of Gold at the Rand Refinery - SAIMM

2011-6-26 · authority on gold metallurgy, and the chlorine refining process was chosen specifically with a view to the rapid and effective treatment of large amounts of bullion. This process had been patented by F.B. Miller, Assayer of the Sydney Mint, in 1867 and used in Australia since 1872 in contrast to the Lon­

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Utilization of gold-bearing and iron-rich pyrite cinder ...

2017-11-9 · The chlorination−volatilization process has been adopted to make full use of gold-bearing and iron-rich pyrite cinder. However, problems of low recovery rate, pulverization of pellets, and ring formation have been encountered during the industrialization of this process. The effects of various parameters on the volatilization rates of valuable metals and on the

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Recovery of gold from sulfide refractory gold ore ...

2021-11-28 · The thiourea leaching combined with pyrite enhanced chlorination roasting was first proposed to effectively extract gold from the second stage roasting slag, and the pyrite shown a great role in promoting gold extraction during chlorination roasting. In this process, gold could be effectively recovered from the sulfide refractory gold ore with ...

Read More