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(PDF) Gold recovery from WEEE by chlorine system

Gold Recovery from WEEE by Chlorine S y stem

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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 using an aqueous ...

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The recovery of gold from refractory ores by the use of ...

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

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Gold Chlorination Processes Methods

2016-8-31  The mill had a capacity of about 6500 tons, per month, and about 90 per cent of the gold and 84 per cent of the silver in the ore were recovered by the process described. Chlorine Volatilization of Gold

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Gold extraction by chlorination using a pyrometallurgical ...

2009-3-1  One of the most widely used chlorinating agents for gold recovery is calcium chloride. The non-ferrous and precious metals react with chlorine to form the corresponding chlorides, which are volatile at the temperature required for the process (1273–1473 K) (Panias and Neou-Syngouna, 1990, Deng and Li, 1987).

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Gold extraction by chlorination using a pyrometallurgical ...

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...

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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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Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3  The feasibility to recover the gold present in alluvial material, by means of a chlorination process, usingchlorine as a reactive agent, has been studied. The influence of temperature and reaction time was stud-ied through changes in the reactant solid. The techniques used to characterize the mineral samples andthe reaction residues were stereomicroscopy, X-ray diffraction, X-ray fluorescence and scanning elec-tronic microscopy. Results indicate that gold extraction is favored by increasing, both, the temperatureand the reaction time. The best recovery

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Gold Chlorination Process by Miller

2015-7-8  It has been noted that the slag may content 1-2% of gold as small beads and tiny particles of gold produced by the reaction of chlorine gas and the molten charge. Usually, the gold is recovered by adding sodium carbonate to the molten charge.

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Gold recovery from refractory gold concentrates by ...

2019-3-1  process of gold bearing sulfur concentrate consumes a lot of energy and releases pollutants such as SO 2 into the air. Couldn’t achieve a satisfactory recovery by electro-chlorination, Zhu et.al had researched leaching of refractory gold ores by ultrasonic-assisted electro-chlorination, the application of

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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 using an aqueous ...

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Recovery of Gold from Incinerated Sewage Sludge Ash by ...

Request PDF Recovery of Gold from Incinerated Sewage Sludge Ash by Chlorination In a series of studies into the development of an efficient and selective recovery process for gold that ...

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Gold Chlorination Process by Miller

2015-7-8  Gold Chlorination Process by Miller. 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

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Miller Gold Refining Process by Chlorination

2016-3-24  Describes the Miller Chlorination Process used in gold refining in all its steps and chemistry. The reactor and chemical used to obtain pure 99.999% gold bars.

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How to Leach Gold Ore With Chlorination Sciencing

2017-4-25  How to Leach Gold Ore With Chlorination ... The rock and gold have been separated, but let the sediments sit in the mixture until it settles to the bottom. Filter the sediment out of the HCL solution using a coffee filter in a funnel or a piece of canvas. The gold

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Gold recovery from refractory gold concentrates by ...

2019-3-1  process of gold bearing sulfur concentrate consumes a lot of energy and releases pollutants such as SO 2 into the air. Couldn’t achieve a satisfactory recovery by electro-chlorination, Zhu et.al had researched leaching of refractory gold ores by ultrasonic-assisted electro-chlorination, the application of

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Leaching of an oxide gold ore with chloride/hypochlorite ...

Gold recovery by activated carbon adsorption was about 49.852%. View. Show abstract ... However, due to high treatment cost, chlorination required high gold ore grades of about 50 g/t (Habashi ...

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Solvent Extraction of Gold(III) with Diethyl Carbonate

2020-6-1  in the recovery of gold from secondary sources, including waste electric and electronic equipment (e-scrap), jewelry, spent catalysts, and copper anode slime.1−6 Developed in the mid-19th century, extraction of gold by chlorination was the first hydrometallurgical gold extraction process available on the commercial scale.

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Gold refining by solvent extraction—the Minataur™ Process

2009-8-26  tested as reducing agents to precipitate gold from the loaded strip liquor. The use of oxalic acid introduces a further degree of selectivity and enables a gold purity of 99.999% to be Gold refining by solvent extraction—the MinataurTM Process 170 JULY/AUGUST 1997 The Journal of The South African Institute of Mining and Metallurgy Table I

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Recovery of Lithium by Chlorination

2017-8-31  The addition of calcium carbonate to the clay was found to improve the lithium recovery. Reaction conditions found to affect the lithium recovery were ratio of clay to carbonate, reaction temperature, and HCl concentration. The best conditions for selective chlorination

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Preliminary Study on Comprehensive Recovery of Gold ...

Preliminary Study on Comprehensive Recovery of Gold Concentrates by Chlorination Chlorination was used to extract gold, silver, copper, lead and zinc from gold concentrate. Parameters of J3 leaching agent (the patented reagents of the research group) concentration, acidity, NaCl concentration, leaching temperature were optimised.

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gold recovery by chlorine gas - BINQ Mining

2012-12-5  gold recovery by chlorination Gulin Solutions ADVANTAGES OF PROCESS The generation of chlorine gas in the chlorine cell 72 using brine as a chlorine source and the use of the gas for the recovery of gold, »More detailed

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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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High-temperature chlorination of gold with transformation ...

2016-10-3  The study results showed that the technical indices of gold high-temperature chlorination rate of 85.19 % and iron recovery of 87.75 % were obtained from cyanide tailings (gold grade of 4.57 gt −1, iron grade of 42.95 %) by chlorination–reduction one-step roasting . The new technology presents advantages of short process time, low energy ...

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extraction of gold by chlorination - africaentrepreneurs.co.za

Gold Chlorination Processes Methods. 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.

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Recovery of gold from carbonaceous ores by simultaneous ...

The ore used in this example is so refractory that with the chlorine levels used, a cyanide leach is mandatory to give a total gold recovery above 80 percent. EXAMPLE V. The same very refractory ore used in Example I was again used in this example. Chlorination rates were greatly increased in this example to improve gold recovery.

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EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD FROM

The optimum recovery of gold with NaOCl is 98.86 % Au at leaching temperature of 40°C, solvent concentration 5 M, NaOCl 5 mL and 20% solid after 120 minutes leaching time. Silver loss under this condition is 2–3%.

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黄金冶炼氰渣火法处理研究现状及展望-Research Status and ...

Gold is wrapped by iron ore and vein stone, which can be recovered effectively only by pyrometallurgical process. Current pyrometallurgical processes include gold and silver recovery by chlorination volatilization roasting, iron recovery by reduction roasting and magnetic separation, and gold and iron recovery by cyanide slag-copper concentrate combined smelting.

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(PDF) Gold Extraction and Recovery Processes For Internal ...

Gold Recovery from Solution The common processes for recovery of the solubilized gold from solution are (certain processes may be precluded from use by technical factors) [5,6]: Carbon Adsorption Merrill-Crowe process Electrowinning Ion-exchange/Solvent Extraction (i) Carbon Adsorption The process known as carbon in pulp, or charcoal in pulp or ...

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Refining of Gold at the Rand Refinery - SAIMM

2011-6-26  transferred to the Silver Refining Branch for subsequent silver recovery. 10.4.2.2 Melting and sampling The average assay of the crude bullion received from the mine is gold 84070, silver 11 % and base metals 5%, although any gold assay over 50% is nor­ mally acceptable. A standard shape of tapered bar has been adopted by all

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