amount of chlorine required in gold leaching

How to Leach Gold Ore With Chlorination Sciencing

Apr 25, 2017  Insert the ORP meter so the probe side is in the water mixture. An ORP meter is used to measure oxidation, which is required to break the gold out of the rock. In fact, according to Mine-Engineer, the amount of oxidation is directly proportional to the rate of gold leaching. The meter tells you how effective the chlorine is while it is ...

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Chlorine leaching of gold-bearing sulphide concentrate and ...

Jun 01, 1992  The extraction of gold was increased by about 3-4% after addition of the chloride in the chlorine leach process. Figure 3 shows the effect of leaching time on the extraction of gold. The leaching rate of gold in a chlorine-saturated leach solution is much higher than that of gold

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Roasting and chlorine leaching of gold-bearing refractory ...

Sep 01, 2013  When Cl 2 has been consumed as a consequence of reaction , the yellow coloration disappears and an additional amount of chlorine must be added in order to allow further oxidant leaching. (1) Points (3) and (4) have to be repeated (4 or 5 times) until the red coloration is definitively permanent: this indicates the end of the leaching.

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Cyanide-free gold leaching in exceptionally mild chloride ...

Oct 10, 2019  All the industrially applied gold leaching methods (historical chlorine gas based leaching, dominating state-of-the-art cyanide gold leaching, processes at precious metals plants) suffer from the characteristics related to aggressive and even toxic leaching media and high chemical consumption. ... with addition of minor amount oxidant (0.1–0 ...

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

Jun 01, 2007  Calcium hypochlorite produced a sluggish gold leaching kinetics, requiring twice more time (46 h) to achieve the maximum gold recovery of 58% compared to sodium hypochlorite. To have a reasonable gold leaching kinetics, it was found that OCl − in solution must be equal or higher than 10 g/L. The amount of HCl added and hence initial pH was ...

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A Method for Leaching or Dissolving Gold from Ores or ...

The hydrometallurgical leaching of native gold from gold-bearing ores or ... a halogen or even a certain amount of hydrogen peroxide to increase the dis-solution rate. Upon dissolution in this ... gold was dissolved into chlorine water (i.e., water saturated by chlorine gas) while bromine water was

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Hypochlorite Leaching of Gold Ore

The reactions between gold and hypochlorite leach solutions containing hydrochloric acid and sodium chloride are demonstrated below: 4Au + 16NaOCl + 10H2O → 4HAuCl4 ...

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How to Leach Gold Ore With Chlorination Sciencing

Apr 25, 2017  Insert the ORP meter so the probe side is in the water mixture. An ORP meter is used to measure oxidation, which is required to break the gold out of the rock. In fact, according to Mine-Engineer, the amount of oxidation is directly proportional to the rate of gold leaching. The meter tells you how effective the chlorine is while it is ...

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Roasting and chlorine leaching of gold-bearing refractory ...

Sep 01, 2013  When Cl 2 has been consumed as a consequence of reaction , the yellow coloration disappears and an additional amount of chlorine must be added in order to allow further oxidant leaching. (1) Points (3) and (4) have to be repeated (4 or 5 times) until the red coloration is definitively permanent: this indicates the end of the leaching.

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The Chlorination of Gold Ores.

The Chlorination of Gold Ores. By Mr. Donald Clark, M.M.E., B.C.E. The ideal method for extracting fine gold would be to dis-solve out the gold with some solvent which would not attack other minerals present. The solvents known 6o years ago were chlorine, bromine, and cyanide of potassium. Yet in

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

The results of the gold leaching experiments showed that the best gold leaching parameters were obtained when the hydrochloric acid-sodium hypochlorite mix was at a ratio of 1 : 2, the added ...

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Bromine leaching as an alternative method for gold ...

Mar 15, 2018  This leaching process has several advantages: it uses a gaseous mixture of chlorine and bromine that is generated in-situ by introducing hypohalides in the reactor itself; the capability of chlorine to oxide bromides implies that a low concentration of bromide is required in the leaching solution; gold is simultaneously leached by chlorine and ...

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CYANIDE-FREE PROCESS FOR GOLD EXTRACTION

Chlorine, along with a catalytic amount of bromine, is used as oxidizing agents because of the particularly fast reaction of bromine with gold. The capability of chlorine to oxidize bromides to bromine, explains the low concentration of bromide required in the brine. 2 HOCl + 2 HCl → 2 Cl2 + H2O 2 NaBr+ Cl2 → 2 NaCl+ Br2 2 Au + 3 Br2 → 2 ...

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A Method for Leaching or Dissolving Gold From Ores or ...

Aug 18, 2005  It was the first hydrometallurgical process to recover gold.9 Svistunov et al., studying the action of chlorine water onto gold, suggested that the dissolution mechanism is based on the reaction ...

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US4723998A - Recovery of gold from carbonaceous ores by ...

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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Gold processing - Refining Britannica

Gold processing - Gold processing - Refining: Gold extracted by amalgamation or cyanidation contains a variety of impurities, including zinc, copper, silver, and iron. Two methods are commonly employed for purification: the Miller process and the Wohlwill process. The Miller process is based on the fact that virtually all the impurities present in gold combine with gaseous chlorine more ...

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A novel zero emission concept for electrogenerated ...

Jan 01, 2016  In this study, a new concept for recycling of chlorine during electrogenerated chlorine leaching has been investigated and applied to the leaching of spent automotive catalyst containing 0.128 wt.% Pt and 0.015 wt.% Rh.The innocuous treatment was achieved by the electrochemical reduction of the unconsumed gas in the cathodic compartment of an in situ chlorine electrogeneration

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Gold Extraction Method Replaces Cyanide With Non

Apr 30, 2018  Chlorine and a catalytic amount of bromine combined as oxidizing agents deliver a particularly fast reaction with gold, with only a small concentration of bromine required in the brine. Chlorination also emerged as an option based on the relatively low temperature of the reaction with a wide variety of minerals.

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Chlorine Amounts Necessary for Disinfection – Pure Water ...

Basic chlorine pellets used in dry pellet chlorinators are around 70% to 75% calcium hypochlorite. Example of a practical application. To disinfect your 50 gallon hot water heater requires 1.5 cups of bleach left in the tank for two hours or 3/4 cup of bleach left overnight. For a 30 gallon tank, cut the amount

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Chlorine leach process - FALCONBRIDGE NICKEL MINES LIMITED

I claim 1. In a process for recovering metal from solid particles selected from sulphides and alloys and containing at least two metals selected from nickel, copper and precious metals, by chlorine leaching the particles as an agitated slurry in a cuprous ion-bearing aqueous chloride solution, the redox potential of which increases upon feeding chlorine thereto and decreases upon feeding the ...

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Chloramine, Chlorine, Lead and Pipes: How Water Treatment ...

What do the most Common Water Treatment Chemicals–Chlorine and Chloramine–Have to do with Lead in Water? Flint’s water crisis is a disastrous story of negligence and environmental injustice. After the city switched its water source, lead–a neurotoxic metal– began leaching from

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International Journal of Mining Science and Technology

Roasting and chlorine leaching of gold-bearing refractory concentrate: ... This paper deals with gold extraction from a refractory concentrate by chlorine leaching. The process ... by electrolysis of NaCl solution in the required amount to avoid gas storage. This is

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(PDF) Chloride-hypochlorite oxidation and leaching of ...

Results showed that after 30 min leaching, 100% of gold was extracted from a 45 min-milled sample while only 37.2% of gold was obtained from the un-milled sample after 480 min leaching (at 25 °C ...

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How to Use Bleach on Gold Ore to Remove Gold Sciencing

Apr 24, 2017  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 mixture produces chlorine that dissolves gold from gold ore.

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CYANIDE-FREE PROCESS FOR GOLD EXTRACTION

Chlorine, along with a catalytic amount of bromine, is used as oxidizing agents because of the particularly fast reaction of bromine with gold. The capability of chlorine to oxidize bromides to bromine, explains the low concentration of bromide required in the brine. 2 HOCl + 2 HCl → 2 Cl2 + H2O 2 NaBr+ Cl2 → 2 NaCl+ Br2 2 Au + 3 Br2 → 2 ...

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Use of chloride–hypochlorite leachants to recover gold ...

Gold leaching optimization is achieved using a rotary drum reactor fed with the leaching solution, the process takes 6 hours and 95 % of gold recovery is obtained, the remnant gold from the ...

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BACK GROUND OF GOLD LEACHING REAGENT ----

The amount of time required for near‐complete gold cyanidation ranges from as little as 10 hours to as long as 44 hours and depends on the size of the gold particles present in the ore. The more oxygen present at the time of cyanidation, the less time the process will take.

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Gold parting - Wikipedia

Gold parting is the separating of gold from silver.Gold and silver are often extracted from the same ores and are chemically similar and therefore hard to separate. Over the centuries special means of separation have been invented. The very earliest precious metals had mixes of gold and silver; gold and silver alloy is called electrum.With the advent of coinage, methods had to be invented to ...

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Facts about Drinking Water Disinfection and the Free ...

water systems in Texas are also required to maintain a minimum amount of residual disinfectant throughout the distribution system to make sure levels of harmful microorganisms remain low. Treatment prior to distribution may utilize a number of different disinfectants, but a public water system is required to use either chlorine or

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Chlorine Residual Testing The Safe Water System CDC

The presence of free chlorine (also known as chlorine residual, free chlorine residual, residual chlorine) in drinking water indicates that: 1) a sufficient amount of chlorine was added initially to the water to inactivate the bacteria and some viruses that cause diarrheal disease; and, 2) the water is protected from recontamination during storage.

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When are You Required to Report an Oil Spill and Hazardous ...

Oct 07, 2020  Any person or organization responsible for a release or spill is required to notify the federal government when the amount reaches a federally-determined limit. Separate reporting requirements exist for: Oil spills; Hazardous substance releases;

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Process simulation and gate-to-gate life cycle assessment ...

Dec 26, 2019  Gold leaching by hypochlorite has been studied by Baghalha and Yen et al. , who suggest that an oxidative pretreatment should be adopted when processing refractory ore (Yen et al. 1990). Gold leaching in hypohalide media is highly dependent on the acidity and generates chlorine gas (Lalancette 2009; Lalancette et al. 2015a).

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NICKEL MATTE CHLORIDE LEACHING - Outotec

Leaching Process, is suitable for nickel refining and is a highly flexible, calcium chloride based processing route for nickel matte and other nickel-containing raw mate-rials. It incorporates two-stage leaching and iron precip-itation stages that make the recovery of precious metals such as gold

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How to Do Cyanide Removal in Gold Tailings? CNFREE

Gold Stripping Chemicals Used for Gold Cyanidation You Need to Know! December ,23,2020 What are the Cyanide-Free Gold Recovery Methods? November ,24,2020 Global Sodium Cyanide Market Analysis. October ,15,2020 Technical Requirements and Advantages of Gold Cyanide Tailings Paste Filling. September ,18,2020

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Gold Extraction Method Replaces Cyanide With Non

Apr 30, 2018  Chlorine and a catalytic amount of bromine combined as oxidizing agents deliver a particularly fast reaction with gold, with only a small concentration of bromine required in the brine. Chlorination also emerged as an option based on the relatively low temperature of the reaction with a wide variety of minerals.

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