gold recovery by chlorination

gold recovery by chlorination

Gold extraction by chlorination using a

The feasibility to recover the gold present in alluvial material, by means of a chlorination process, using chlorine as a reactive agent, has been studied. The influence of temperature and reaction time was studied through changes in the reactant solid.

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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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The recovery of gold from refractory ores by the use

1990-9-1  Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added

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Recovery and kinetics of gold and iron from cyanide ...

2020-8-15  The gold enclosed by iron oxide, gold enclosed by sulfide, and exposed gold are mainly recovered by one-step chlorination-reduction roasting. From Table 3, iron mainly existed in the form of hematite and magnetite, with distribution of 89.39% and 6.82%, respectively.

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The recovery of gold from refractory ores by the use

1990-9-1  Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added

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Gold Chlorination Processes Methods

2021-3-22  In Liddell’s Handbook of Nonferrous Metallurgy, Vol. 2, 1945, there is to be found a very complete account of the uses of chlorine as applied to the recovery of gold and silver, in Chlorination Processes Methods. Introducing the chapter entitled “Chlorine Metallurgical Processes” Liddell says: Chlorine as a metallurgical agent appears to have lost ground during recent years, and much ...

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Recovery of Gold from Incinerated Sewage Sludge

2019-5-26  In a series of studies into the development of an efficient and selective recovery process for gold that eliminates the need for water, the release behavior of gold from an incinerated sewage sludge ash heated to between 100 and 1000 °C under a chlorine gas stream was investigated.

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Gold Chlorination Process by Miller

2021-3-22  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.

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Recovery of gold from sulfide refractory gold ore: Oxidation ...

2021-2-22  The method consisted of two stages roasting for arsenic and sulfur removal, gold recovery by thiourea leaching, followed by an enhanced chlorination roasting for gold recovery in the presence of pyrite. In the two-stage roasting process, the phase transition of FeAsS and FeS 2 during the roasting process was analyzed.

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A study of gold leaching performance and mechanism

Abstract: In the present work, sodium dicyanamide (SD) was used as a leaching reagent for gold recovery, and the effects of SD dosage and solution pH on gold leaching performance were investigated.It was found that a gold recovery of 34.8% was obtained when SD was used as the sole leaching reagent at a dosage of 15 kg/t. It was also found that in the presence of a certain amount of

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The recovery of gold from refractory ores by the use

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology.

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Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3  rine reagent and a simplification of gold separation and purification. The chlorination equipment used in the laboratory has a simple design and permits a safer use of chlorine gas. References Deng, H., Li, X., 1987. Chloride roasting of a complex gold ore and treatment of chlorine fume for precious-metal recovery-experimental results ...

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Gold Chlorination Processes Methods

2021-3-22  In Liddell’s Handbook of Nonferrous Metallurgy, Vol. 2, 1945, there is to be found a very complete account of the uses of chlorine as applied to the recovery of gold and silver, in Chlorination Processes Methods. Introducing the chapter entitled “Chlorine Metallurgical Processes” Liddell says: Chlorine as a metallurgical agent appears to have lost ground during recent years, and much ...

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What are the Cyanide-Free Gold Recovery Methods?

1. Water Chlorination Process. The gold leaching chemical reaction equation of this cyanide-free gold recovery method is as follows: 2Au+3Cl2+2HCl→2HauCl4. The reaction shows that gold is oxidized by chlorine and combined with chloride ions, so it is called the water chlorination gold leaching method.

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Chlorine extraction of gold - DUNN; WENDELL E.

The chlorination reaction may be conducted under pressures of 1 to 2 atmospheres, absolute. In order to obtain the maximum recovery of gold from the ore, staged reactors may be used. The amount of chlorine consumed to made gold by-products is small since the amount of gold in the ore is generally small. Excess chlorine is used in the process.

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Method of recovering gold powder - Nippon Mining

The gold recovery method of the invention comprises basically the steps of solvent extraction from a gold bearing chlorination leach solution with DBC, scrubbing the resulting gold bearing organic phase with hydrochloric acid and reducing gold from the organic phase

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Gold Chlorination Process by Miller

2021-3-22  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 all the chlorides formed rise to the surface and are ...

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US Patent for Recovery of gold from carbonaceous

A gold recovery process is disclosed in which the gold content of ores, including carbonaceous ores or mixtures of carbonaceous and oxide ores, is extracted by a simultaneous chlorine leach and ion exchange resin adsorption procedure. The process eliminates or reduces the degree of oxygenation and cyanidation required to conduct a standard gold extraction process.

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Recycling gold and copper from waste printed circuit ...

Chlorination is a feasible alternative for the recovery of metallic elements due to the higher dissolution rate, non-polluting character and selective leaching of different metals by controlling the redox potential. In the present study, an efficient and less-polluted chlorination process to recycle gold and copper from waste PCBs was investigated.

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Chapter - L HYDROMETALLURGY SOLUTION MINING

2013-5-9  Many of studies on the kinetic aspect of gold chlorination suggest that the diffusion through the product layer is the rate- controlling step (M.I. Jeffrey et al 2001). Figure 1. The evolution of Au concentration versus time, at different temperatures Figure 2. The maximum recovery of gold from anode slime at different temperature

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The recovery of gold from refractory ores by the use

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology.

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Method of recovering gold powder - Nippon Mining

The gold recovery method of the invention comprises basically the steps of solvent extraction from a gold bearing chlorination leach solution with DBC, scrubbing the resulting gold bearing organic phase with hydrochloric acid and reducing gold from the organic phase

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US Patent for Recovery of gold from carbonaceous

A gold recovery process is disclosed in which the gold content of ores, including carbonaceous ores or mixtures of carbonaceous and oxide ores, is extracted by a simultaneous chlorine leach and ion exchange resin adsorption procedure. The process eliminates or reduces the degree of oxygenation and cyanidation required to conduct a standard gold extraction process.

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Electrochemical recovery of minor concentrations of gold ...

Electrochemical recovery of minor concentrations of gold from cyanide-free cupric chloride leaching solutions Ivan Korolev a, b, Pelin Altınkaya a, b, Petteri Halli b, Pyry-Mikko Hannula b, Kirsi Yliniemi b, Mari Lundstr€om b, * a Outotec Research Center, P.O. Box 69, Kuparitie 10, 28101 Pori, Finland b Aalto University School of Chemical Engineering, P.O. Box 16100, 00076 Aalto, Finland

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Recycling gold and copper from waste printed circuit ...

Chlorination is a feasible alternative for the recovery of metallic elements due to the higher dissolution rate, non-polluting character and selective leaching of different metals by controlling the redox potential. In the present study, an efficient and less-polluted chlorination process to recycle gold and copper from waste PCBs was investigated.

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Extraction of Gold

Bromine acts more energetically than chlorine, and has also been employed in the extraction. The recovery of the gold is effected similarly, and the bromine is then liberated by the action of chlorine, but it is impossible to prevent loss of bromine. Cyanide-process The extraction of gold by the cyanide-method is of great technical importance.

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Chapter - L HYDROMETALLURGY SOLUTION MINING

2013-5-9  Many of studies on the kinetic aspect of gold chlorination suggest that the diffusion through the product layer is the rate- controlling step (M.I. Jeffrey et al 2001). Figure 1. The evolution of Au concentration versus time, at different temperatures Figure 2. The maximum recovery of gold from anode slime at different temperature

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Refining Gold Jewelry Scraps - Ganoksin Jewelry

Miller Chlorination Process. A pyrometallurgical chlorination process, the Miller process is one of the oldest and most widely used processes in large scale gold refining. It involves bubbling chlorine gas through molten bullion. ... Compare the overall cost of in-house refining to the recovery efficiency (the amount of gold and other precious ...

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How to Use Bleach on Gold Ore to Remove Gold

Gold is an almost non-reactive metal, but halogens — chlorine, bromine, fluorine and iodine — can dissolve it. Chlorine is the cheapest and lightest product that can achieve this. Bleach is the chemical compound sodium hypochlorite. When combined with hydrochloric acid, the

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Gold refining by solvent extraction—the Minataur™ Process

2009-8-26  in gold-refining technology, but may be instrumental in initiating important changes in the legislation regulating the marketing of gold in South Africa. Gold of either 99.99% or 99.999% purity can be produced from intermediate process products having a wide range of gold contents. The process comprises oxidative leaching of the solid

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