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sodium hypochlorite process gold

Advances in Gold and Silver Processing

using sodium sulphite. A similar process was conducted by Finkelstein et al. (1966) in South Africa for the treatment of Merrill slimes and gravity gold concentrates with chlorine leaching. A very high purity gold product at 999.9 parts per thousand was produced. Schneiner et al. (1971) and Guay et al. (1961, 1973) have pre-treated Carlin-type carbonaceous refractory gold ore in Nevada with ...

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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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CLEVR Process™ - Dundee Technologies

DST’s CLEVR Process TM uses sodium hypochlorite with a catalytic amount of sodium hypobromite in acidic conditions to put the gold into solution. Contact time is short, and the process operates in a closed loop. All chemicals are recycled within the circuit and, sea water is also suitable where available. Depending on the nature of the mineral, pre-treatment may be required prior to the gold ...

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Gold Recovery Process from Primary and Secondary

However, by adding sodium hypochlorite to the gold(I) solution in hydrochloric acidic media, ... the main hydrometallurgical process for gold and silver ores is cyanide leaching followed by gold recovery by means of adsorption on strongly basic anion exchange resins and activated carbon or by means of cementation using zinc powder. In the adsorption process, the adsorbed gold is recovered by ...

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How to Use Bleach on Gold Ore to Remove Gold Sciencing

24/04/2017  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. This ...

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(PDF) Detoxification of Cyanide in a Gold Processing Plant ...

The oxidants including chlorine, hypochlorite (sodium or calcium), ozone, hydrogen peroxide, ... This process consists of leaching gold from the ore as a gold-cyanide complex, and gold being ...

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

An alternative non-cyanide lixiviant, namely sodium hypochlorite, has been used for the selective extraction of gold and silver from a copper concentrate. Hypochlorite leaching of the as-received ...

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Manufacturing Process - Sodium Hypochlorite

There are many stages to be done to create sodium hypochlorite. The process is split in two components called, "Reaction and Product Discharge" and "Bleach Filtration". ("Intratec Solutions LLC", 2005) In the Reaction and Product Discharge stage, there is a chlorine absorption system that can be divided into two systems. The first system has a packed column that contains caustic safely. Then ...

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Sodium hypochlorite - Wikipedia

In the process, sodium hypochlorite (NaClO) and sodium chloride (NaCl) are formed when chlorine is passed into cold dilute sodium hydroxide solution. The chlorine is prepared industrially by electrolysis with minimal separation between the anode and the cathode. The solution must be kept below 40 °C (by cooling coils) to prevent the undesired formation of sodium chlorate. Commercial solutions ...

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How to Use Bleach on Gold Ore to Remove Gold Sciencing

24/04/2017  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

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DISSOLUTION OF SILVER AND GOLD WITH SODIUM

Two-stages leaching was carried out, first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4), a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl), the results shows extraction around 96% for Mn, 98.73% and 83% of Ag and Au respectively. The usefulness of high acidity and ...

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

Miner. Process. 49(1), ... conditions were obtained at 200 g/dm3 3calcium hypochlorite, 200 g/dm sodium chloride and initial pH 11 (with 200 g/dm3 concentrate, stirring speed 600 rpm and temperature 25 C) at which about 82% gold was extracted in 2 h. Keywords: refractory gold ore, oxidative pre–treatment, non–cyanide leaching Introduction Although cyanide has been used commercially for

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

01/06/2007  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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Sodium hypochlorite - Wikipedia

Sodium hypochlorite (commonly known in a dilute solution as bleach) is a chemical compound with the formula NaOCl or NaClO, comprising a sodium cation (Na +) and a hypochlorite anion (OCl − or ClO −). It may also be viewed as the sodium salt of hypochlorous acid. The anhydrous compound is unstable and may decompose explosively. It can be crystallized as a pentahydrate NaOCl 5 H 2 O, a ...

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EXTRACTION OF GOLD, SILVER AND COPPER FROM THE COPPER ...

process of those concentrate all gold and silver are practically in the blister copper, which is cast into anodes. Those copper anodes are electrorefined in an electrolytic system, where the electrolyte is an acid copper sulphate solution, where a high purity electrolytic copper is produced (>999,9/1000). The slime when submitted to an oxidative leaching process, using sodium hypochlorite and ...

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Mechanisms of Actions of Sodium Hypochlorite in Cleaning ...

microbes (disinfection) are performed with sodium hypochlorite in a single process. However, the *Correspondingauthor.Tel:+81-86-286-9600,Fax:+81-86-286-9630. 148S.FUKUZAKl TABLE 1. Characteristics of sodium hypochlorite solution as the ideal disinfectant. mechanisms of sodium hypochlorite actions in clean- ing and disinfection processes are originally different from each other.

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Sodium Hypochlorite Handbook - Occidental Petroleum

he patented a process for the manufacture of bleaching powder where chlorine gas was absorbed in a dry lime hydrate. Labarraque succeeded, in 1820, in preparing sodium hypochlorite by chlorinating a solution of caustic soda. Varying concentrations of this solution have found a multitude of applications so that the general public is now well acquainted with the material. This handbook will ...

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Buy Gold Recovery Chemicals: Nitric Acid $15, Hydrochloric ...

How To Use Sodium Hypochlorite (Bleach) To Dissolve Gold. Bleach is the chemical compound sodium hypochlorite. When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from gold ore. Allow four hours for the gold to dissolve, stirring every 20 minutes.

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When finished, wash and dry your hands

Use of hypochlorite bleach After cleaning, a chlorine-releasing product is recommended for use against norovirus. The preferred disinfectant is 0.1% sodium hypochlorite (1000 parts per million available Chlorine). Follow the manufacturer’s instructions and never mix different types of chemical as the fumes can be dangerous. If a bleach is used, a good quality chlorine based (hypochlorite ...

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DISSOLUTION OF SILVER AND GOLD WITH SODIUM

Two-stages leaching was carried out, first to eliminate manganese from the sample using sodium sulfite (Na2SO3) as a reductive reagent and sulfuric acid (H2SO4), a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl), the results shows extraction around 96% for Mn, 98.73% and 83% of Ag and Au respectively. The usefulness of high acidity and ...

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Sodium Hypochlorite Chemical Production - Chemical ...

The chemical process relies on the acquisition of chlorine and caustic soda (sodium hydroxide; NaOH) feedstock from external sources, in contrast with the electrochemical process for bleach, which also involves brine electrolysis. The process The chlorination of caustic soda to sodium hypochlorite is an exothermic reaction. The chemical production process depicted below is a widely used ...

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Mechanisms of Actions of Sodium Hypochlorite in Cleaning ...

microbes (disinfection) are performed with sodium hypochlorite in a single process. However, the *Correspondingauthor.Tel:+81-86-286-9600,Fax:+81-86-286-9630. 148S.FUKUZAKl TABLE 1. Characteristics of sodium hypochlorite solution as the ideal disinfectant. mechanisms of sodium hypochlorite actions in clean- ing and disinfection processes are originally different from each other.

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Sodium hypochlorite pretreatment for heap leaching

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OPERATOR ESSENTIALS

Sodium hypochlorite Sodium hypochlorite is chlorine gas dissolved in sodium hydroxide. This is essentially household bleach. Sodium hypochlorite is a disinfectant that is liquid at room temperature and can be dosed with chemical feed pumps. Hypochlorite chemistry Na+ OCl– + H 2 O ——> H+ OCl– + Na+ OH– Hypochlorite (OCl–) is the disinfecting ion in this compound. The hydroxyl ion ...

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Mechanisms of actions of sodium hypochlorite in cleaning ...

Sodium hypochlorite fulfills many requirements as the ideal disinfectant and furthermore it has an excellent cleaning action. The effectiveness of sodium Mechanisms of actions of sodium hypochlorite in cleaning and disinfection processes Biocontrol Sci. 2006 Dec;11(4):147-57. doi: 10.4265/bio.11.147. Author Satoshi Fukuzaki 1 Affiliation 1 Industrial Technology Center of Okayama

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When finished, wash and dry your hands

Use of hypochlorite bleach After cleaning, a chlorine-releasing product is recommended for use against norovirus. The preferred disinfectant is 0.1% sodium hypochlorite (1000 parts per million available Chlorine). Follow the manufacturer’s instructions and never mix different types of chemical as the fumes can be dangerous. If a bleach is used, a good quality chlorine based (hypochlorite ...

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Understanding Sodium Hypochlorite Treatment Plant

Sodium hypochlorite disintegrates when heated or if it contacts acids, sunlight, certain metals, and poisonous and corrosive gases, including chlorine gas. It is a strong oxidant that reacts with flammable compounds and reducing agents, and it is flammable. These characteristics must be kept in mind during transport, storage and use. The presence of caustic soda in sodium hypochlorite means ...

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EXTRACTION OF GOLD, SILVER AND COPPER FROM THE COPPER ...

process of those concentrate all gold and silver are practically in the blister copper, which is cast into anodes. Those copper anodes are electrorefined in an electrolytic system, where the electrolyte is an acid copper sulphate solution, where a high purity electrolytic copper is produced (>999,9/1000). The slime when submitted to an oxidative leaching process, using sodium hypochlorite and ...

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Cyanide Destruction: A New Look at an Age-Old Problem ...

Traditional treatment involves a high pH of 10.5, and a high oxidation-reduction potential (ORP) of +600 mV. It is a chemically heavy process, using approximately 23 gallons of 12.5% sodium hypochlorite solution to destroy one ounce of cyanide. Sodium hypochlorite usage at this rate is quite high.

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