sodium hypochlorite process gold

sodium hypochlorite process gold

Advances in Gold and Silver Processing

0.5 % sodium hypochlorite solution, less than 30 % of gold is dissolved in one hour. As the concentration of sodium hypochlorite increases the rate of gold dissolution increases. In a 2 % sodium hypochlorite solution, 88 % of the gold is dissolved in 20 minutes and more than 91 % of the gold dissolved in one hour. If the concentration

Hypochlorite Leaching of Gold Ore

Nov 08, 2017 · An acidic hypochlorite solution can be added to the autoclave for pressure oxidation and extraction of the gold at the same time. It required 50 % sodium hypochlorite or 120 kg/t available chlorine to extract 97 % of the gold from the ore. When 3 % HCl and 10 g/L NaCl was added to the leach solution, the same amount of gold could be extracted ...

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.

CLEVR Process™ - Dundee Technologies

Technology. 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

US3639925A - Recovery of gold from carbonaceous ores ...

Carbonaceous gold ores are rendered amenable to a conventional cyanide recovery process by pretreatment with sodium hypochlorite or calcium hypochlorite compounds at temperatures under 70* C. Hypochlorite solutions can be generated in situ by electrolysis of chloride solutions.

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 ...

Sodium Hypochlorite - an overview | ScienceDirect Topics

Sodium hypochlorite is produced for the treatment of cooling water (CW). Sea water is pumped through strainers to banks of electrochiorination cells. Thyristor controlled rectifier units provide LV variable voltage DC supplies to the cells, thereby controlling the rate of production of sodium hypochlorite by electrolysis within the cells. A by-product of the process is hydrogen, which is of ...

Frequently Asked Questions (FAQs) about Sodium ...

Investigations have shown sodium hypochlorite to be an effective disinfectant having broad applications. Although a number of other disinfectants (calcium hypochlorite, ozone, UV, solar disinfection) and treatment processes (filters, slow sand filtration) have been investigated, sodium hypochlorite appears to offer the best mix of low cost, ease of use, safety, and effectiveness in areas

Right to Know Hazardous Substance Fact Sheet

Sodium Hypochlorite is a clear, slightly yellow or green liquid with a strong Chlorine odor. It is usually mixed in water and used as a household cleaner, a disinfectant, and a bleaching ... f Label process containers. f Provide employees with hazard information and training.

Buy Gold Recovery Chemicals: Nitric Acid, 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. The chlorine reacts with the gold inside the ore to form gold ...

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

An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl)2 vs. NaOCl, OCl− concentration, and HCl concentration on ...

US20100059387A1 - Process for the on-site production of ...

The present invention relates to a novel economical on-site electrochemical based membrane cell based process with the capability of producing high strength sodium hypochlorite and/or elemental chlorine gas in any ratio as required by the needs of a water or wastewater treatment plant. The system is compact and modular, using membrane cell based electrolyzers and utilizing novel process ...

Frequently Asked Questions (FAQs) about Sodium ...

Investigations have shown sodium hypochlorite to be an effective disinfectant having broad applications. Although a number of other disinfectants (calcium hypochlorite, ozone, UV, solar disinfection) and treatment processes (filters, slow sand filtration) have been investigated, sodium hypochlorite appears to offer the best mix of low cost, ease of use, safety, and effectiveness in areas

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

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 63 Fig. 1. The Pourbaix diagram of Fe–S at [Fe] –= 10 4 M, [S] = 10– M and 25 C (the chlorine species regions are also marked) (Marsden and House, 2005) Fig. 2.

Antimicrobial Irrigants in the Endodontic Therapy

Sodium hypochlorite is still the most effective ‘gold standard irrigant’. Unlike with sodium hypochlorite, the extrusion of iodine and chlorhexidine is thought to be more forgiving to the soft tissues as they do not dissolve organic tissue. Chelators in liquid form are not a replacement for antimicrobial irrigants like NaOCl.

DETOXIFICATION OF EFFLUENTS WITH CYANIDE.

Figure 4.11: Chromatograms of the reaction of cyanide with sodium hypochlorite and ozone. Figure 4.12: Degradation of cyanide in leaching by cyanidation. Figure 4.13: Gold and silver extraction curve in cyanidation process. Figure 4.14: Mass Balance of the process and was balance referent to the Gold, Silver and CN-behavior.

Routine Cleaning, Disinfecting and Maintenance of EEG ...

Gold-plated cup electrodes are commonly used as measurement of electrical activity of the brain during an electroencephalography (EEG) and to determine sleep/wake states ... Disinfect the electrodes in Bleach (5.25% Sodium Hypochlorite ) a. Soak the electrode cup in a 1:500 dilution of household bleach for less than 1 hr. (Adding 2 milliliters ...

THIOSULPHATE LEACHING – AN ALTERNATIVE TO

thiosulphate leaching process, followed by resin-in-pulp gold extraction, has been developed by SGS to the point where it is a technically and economically viable alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in

Selecting an appropriate method to remove cyanide from the ...

Jun 05, 2018 · Consequently, using sodium hypochlorite is suggested as the most appropriate method to remove cyanide from the wastewater of the Moteh gold mine. Based on the data provided by various experts, the use of sodium hypochlorite was selected as the best option (the option ranked first).

Effect of Pretreatment of Sulfide Refractory Concentrate ...

The majority of the refractory gold and silver occurs in occlusion in sulphides, then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochlorite-sodium-hydroxide solution followed of pressure cyanidation of the oxidized concentrate, for the extraction of precious metals. This process was conducted and evaluated under cyanide and oxygen ...

Study of Hypochlorite Reduction Related to the Sodium ...

Apr 21, 2016 · Reduction of hypochlorite is the most important side reaction in the sodium chlorate reactor leading to high energy losses. Today chromate is added to the reactor solution to minimize the hypochlorite reduction but a replacement is necessary due to health and environmental risks with chromate. In order to understand the effect of different substrates on the hypochlorite reduction, α

CYANIDE WASTEWATER TREATMENT - Sensorex

hypochlorite or by addition of chlorine gas and sodium hydroxide. In the second step, cyanate is oxidized to carbon dioxide and nitrogen by further addition of the chosen oxidizing agents. pH and REDOX (ORP) Control in Cyanide Wastewater Treatment Systems In order to ensure that the alkaline chlorination process

Gold Recovery Process from Primary and Secondary Resources ...

Here, the sample solution of sodium gold(I) sulfite, Na 3 [Au(SO 3) 2], was colorless. But, after the addition of excess amount of sodium hypochlorite in the presence of hydrochloric acid, the color was changed to pale yellow, the color of AuCl 4 −, i.e.,

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

In this paper, gold leaching of a refractory sulfide concentrate by chloride–hypochlorite solution was investigated and effects of stirring speed, temperature and particle size on the leaching ...

The Igoli Mercury Free Gold Extraction Process Acid Bleach ...

The process uses a mixture of pool acid (dilute hydrochloric acid), bleach (sodium hypochlorite) and sodium metabisulphate to leach and recover gold. Artisanal and small-scale miners concentrate their gold using sluice boxes followed by panning as a final physical separating method.

Sodium hypochlorite | NaOCl - PubChem

Sodium hypochlorite in 0.5% w/v solution is called Dakin's solution, and is used as an antiseptic to clean infected topical wounds. Sodium hypochlorite is an inorganic sodium salt in which hypochlorite is the counterion. It is used as a bleaching and disinfecting agent and

Effect of Pretreatment of Sulfide Refractory Concentrate ...

The majority of the refractory gold and silver occurs in occlusion in sulphides, then precious metal dissolution is possi- ble by first oxidizing auriferous sulfide concentrate using sodium hypochlorite-sodium-hydroxide solution followed of pressure cyanidation of the oxidized concentrate, for the extraction of precious metals.

Detoxification of Cyanide in a Gold Processing Plant ...

Nov 16, 2007 · In laboratory experiments, cyanide in waste water from the Muteh gold mine in Iran was oxidized by sodium and calcium hypochlorite to cyanate (CNO−), which is 1,000 times less environmentally hazardous than cyanide. Experiments were conducted using waste water containing 270 mg/L cyanide over a pH range of 6–13 and temperatures between 25 and 50°C. Cyanide was

Resistance to Cyclic Fatigue of Nickel-Titanium Files ...

Sep 19, 2020 · Background/purpose . To assess the resistance to cyclic fatigue (CF) displayed by two nickel-titanium (NiTi) files, One Curve (OC) and ProTaper Gold (PTG), after their immersion in 2.5% sodium hypochlorite (NaOCl) solution at body temperature. Materials and Methods . Forty-five files from each brand were randomly assigned to three groups (n = 15) and

Chlorination process for removing precious metals from ore ...

A process for removing precious metals from comminuted ores. The process comprises the steps of first contacting comminuted ore with a primary acidic hypochlorite solution, separating the ore from the primary hypochlorite solution and then contacting the separated ore with an aqueous hypochlorite solution having a pH greater than 7.

CYANIDE WASTEWATER TREATMENT - Sensorex

hypochlorite or by addition of chlorine gas and sodium hydroxide. In the second step, cyanate is oxidized to carbon dioxide and nitrogen by further addition of the chosen oxidizing agents. pH and REDOX (ORP) Control in Cyanide Wastewater Treatment Systems In order to ensure that the alkaline chlorination process

Hydrometallurgical process for the recovery of silver from ...

In EP-A10 176 100, the use of sodium hypochlorite to generate chlorine gas is exploited in that the sodium hypochlorite solution is introduced into a hydrochloric acid slurry which has previously been freed from acid soluble copper, nickel and lead. Of course, this process requires a separate step for the removal of the copper, nickel and lead.

Compare and evaluate the antibacterial efficacy of sodium ...

Sodium hypochlorite remains the gold standard for bacterial elimination in root canal therapy. However, with C. officinalis , further scientific investigation can be carried out to elucidate its antimicrobial effectiveness and mechanisms inside the root canal system

Water Treatment - Ixom

Ixom provides chemicals, technologies, services and equipment for water treatment. Ixom products and services are used by water authorities for the supply of safe drinking water and the treating of waste water and by industrial customers in water and process applications. Markets include pulp and paper, food and beverage, cleaning, pool, dairy ...

Guidelines for disinfection of quarantine facility (for ...

• Cover the spill with sodium hypochlorite(1%)for 10–20 minutes contact time. • Clean up spill and discard into infectious waste bin, and mop area with soap and hot water. • Clean the mop and mop area with 1% sodium hypochlorite. • Wash mop with detergent and hot water and allow it to dry. Stethoscope Alcohol-based rub/Spirit swab

Calcium Hypochlorite Sodium Process Water ... - Alibaba

Buy Sodium Hypochlorite Saudi Arabia Direct From Sodium Hypochlorite Factories at Alibaba. Help Global Buyers Source Saudi Arabia Easily. MENU ... Gold Plus Supplier ... Sort By : Minimum Order: OK. Add to Compare. Calcium Hypochlorite Sodium Process Water Treatment Compound. Tianjin Yufeng Chemical Co., Ltd. US $950.00-$1350 ...