• Mon - Sun: 24/7 online service for you
Get A QUOTE

hypochlorite leaching of gold ore

Integrated Eco-sustainable System for Alluvial Gold Leaching-Recovery

Hypochlorite produced by electrolysis of sodium chloride has been used to leach gold from the mercury amalgam5,6. In this research work an integrated system is designed for the leaching of gold in alluvial ores using sodium hypochlorite in sodium chloride at pH 2 as a leaching solution. 2. Experimental part 2.1 Preparation of the sample

WhatsApp:+8617329420102

Chapter 237: 2. Thiosulfate Leaching Chemistry - Gold Ore Processing ...

Early reports by Jeffrey and co-workers considered the fundamental kinetic and electrochemical aspects of gold and silver leaching with ammoniacal thiosulfate and compared alternative lixiviants such as cyanide and chloride/hypochlorite Breuer et al., Breuer and Jeffrey, Jeffrey, In general, the initial rate of leaching with 0.1 thiosulfate ...

WhatsApp:+8617329420102

Direct Cupric Chloride Leaching of Gold from Refractory Sulfide Ore ...

The main steps in the direct chloride leaching process are as follows: atmospheric leaching, gold recovery by solvent extrac- tion (SX), gold reduction, and neutralization steps. In the Reference process, chloride leaching and gold recovery are pre- ceded by sulfide breakdown at elevated temperature and pres-

WhatsApp:+8617329420102

Leaching of Silver and Gold Contained in a Sedimentary Ore, Using ...

Some sedimentary minerals have attractive contents of gold and silver, like a sedimentary exhalative ore available in the eastern of Hidalgo in Mexico. The gold and silver contained represent an interesting opportunity for processing by non-toxic and aggressive leaching reagents like thiosulfate. The preliminary kinetic study indicated that the leaching process was poorly affected by ...

WhatsApp:+8617329420102

Cyanide Facts | The Cyanide Code

At low pH and at neutral pH, hydrogen cyanide is the dominant form of cyanide, and as pH increases CN- becomes the dominant form. At a pH of 11, over 99% of the cyanide remains in solution as CN-, while at pH 7, over 99% of the cyanide will exist as HCN. At a pH of 9.3 - 9.5, CN - and HCN are in equilibrium, with equal amounts of each present.

WhatsApp:+8617329420102

Research Progress of Gold Extracting by Chlorination

Jun 25, 2022Research on gold extraction by chlorination has shown a significant increase since 2010, and there are more literatures on gold extraction by liquid chlorination. Soon after the birth of the chlorination gold extraction process, the cyanidation method came out one after another.

WhatsApp:+8617329420102

Chloride-hypochlorite oxidation and leaching of refractory sulfide gold ...

In this research, oxidation of sulfide minerals and leaching of gold from a gold bearing sulfide concentrate using chloride hypochlorite solution was investigated. The effects of calcium...

WhatsApp:+8617329420102

Can gold miners say 'sayonara' to cyanide? - Canadian Mining Journal

The difficult-to-process ore has very high levels of carbonaceous, "preg-robbing" material which competes with activated carbon in the cyanidation process to capture the gold. Barrick's thiosulphate processing plant poured its first gold at the end of 2014, but the plant has underperformed on recoveries, Raponi notes.

WhatsApp:+8617329420102

INFORMATION TO USERS - University of Nevada, Reno

University of Nevada Reno Sodium Hypochlorite Pretreatment for Heap Leaching Gold Ores A thesis submitted in partial fulfillment of tht for the degree of Master of Science in Metallurgical Engineering by Frit~-Peter Sawyer M 1987 The thesis of Fritz-Peter Sawyer is approved: D, G School University of N Reno M 1987 ©1987

WhatsApp:+8617329420102

Acid leaching decarbonization and following pressure oxidation of ...

Although atmospheric pressure hypochlorite oxidation method has a positive effect on decarburization and oxidation of the pyrite, it has no improvement on ... Carbonic refractory gold ore; (b) Acid leaching residue 4:1 and 5:1 was added into titanium autoclave. Pressure oxidation was run for 1.5 h at 210 °C, with stirring speed ...

WhatsApp:+8617329420102

Leaching of an oxide gold ore with chloride/hypochlorite solutions

Due to formation of CaOCl+complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice the time (46 h) to achieve maximum gold recovery of 58% compared to sodium hypochlorite. 10 g/L of total initial hypochlorite species in solution produces reasonable gold recoveries.

WhatsApp:+8617329420102

Descripción: USE OF CHLORINE ELECTROGENERATED FROM NaCl IN ACID MEDIUM ...

This mixture of chloride and hypochlorous was used to leach gold from alluvial ore to its complex forms, [AuCl2]-, [AuCl4]-. The optimal amounts of NaCl in a neutral medium for gold leaching was 10 g L-1, while at pH 2, with a fixed NaCl concentration of 10 g L-1 it was observed a gold leaching increment of 70.4%.

WhatsApp:+8617329420102

Optimization Process of the Refractory Gold Ore Extraction by ...

Jan 8, 2021Therefore, the pH range from 4 to 6 was selected in conducting the hypochlorite leaching experiment of the gold ore sample. The control experiment in 1.0 M Ca (OCl) 2 solution and constant pH 5 showed that the cumulative percentage of gold extraction was increased to 52.2% compared to the control experiment without pH control, which was 13.5%.

WhatsApp:+8617329420102

Gold Leaching from Printed Circuit Boards (PCBs) as one of the Urban ...

Leaching time was set for two hours and the shaking speed of waterbath was set at fixed value of 200 rpm. In order to quantify the final concentration of gold in the solution, Atomic Absorption Spectroscopy (AAS) was applied for all samples. Response Surface Method (RSM) is utilized to know the optimum result of Au extracted.

WhatsApp:+8617329420102

Iodine leach for precious metals - TreasureNet 🧭 The Original ...

Iodine has never been a very popular choice for leaching gold, probably because of all the halogens (fluorine, chlorine, bromine, iodine and astatine), it ranks second to last in activeness. ... and one using Sodium Hypochlorite and NaOH, ... regardless of temperature of the leach or the length of time the ore is exposed to the leach. John ...

WhatsApp:+8617329420102

Method of Oxidative Leaching of Sulfide Ores And/Or Concentrates

a method for leaching one or more target metals from a sulfide ore and/or concentrate containing such, the method comprising the steps of: (a) exposing the ore and/or concentrate to an aqueous solution of chlorine-based oxidising species in which the hypochlorous acid comprises at least 10 mol % of the chlorine-based oxidising species; (b) .

WhatsApp:+8617329420102

Chloride Hypochlorite Oxidation and Leaching of Refractory Sulfide Gold ...

In hypochlorous acid solu- tions, gold is also dissolved as the [AuCl 4]¯ complex. Therefore it is possible to oxi- dize sulfides and leach gold simultaneously by this oxidant (Welham and Kelsall, 2000). Leaching of gold with hypochlorous acid follows reaction (1) (Jeffrey et al., 2001): +2Au + 3HOCl + 3H + 5Cl¯ 2[AuCl 4]¯ + 3H 2

WhatsApp:+8617329420102

The reasons of gold refractory, Gold ore classification, and ...

Classification based on leaching rate. III. Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do'Rob gold'in gold and silver ore, and it causes ...

WhatsApp:+8617329420102

Gold Extraction Process Methods Summary - JXSC Machine

R-OH+Au (CN)2-═R-Au (CN)2+OH-. Gold extraction process flow. (1) Adsorption: When the gold-containing cyanide solution passes through the exchange resin column, an ion exchange reaction occurs, and gold is adsorbed on the resin. (2) Desorption: Desorbing the gold on the resin into the solution with a desorbent.

WhatsApp:+8617329420102

Bromine leaching as an alternative method for gold dissolution

cyanide and thiosulfate leaching for the same ore indicates that bromine is a good technical alternative for leaching this gold ore. The following advantages may be stressed: fast dissolution rate, non-toxic reagents, it does not require the use of pH regulator and can be performed with low quantities of leaching solution. 1. Introduction

WhatsApp:+8617329420102

Chloride-hypochlorite oxidation and leaching of refractory sulfide gold ...

In this research, oxidation of sulfide minerals and leaching of gold from a gold-bearing sulfide concentrate using chloride-hypochlorite solution was investigated. The effects of calcium hypochlorite concentration, sodium chloride concentration and initial pH of leachant on changes of the slurry pH and Eh were examined.

WhatsApp:+8617329420102

Thiosulfate Leaching of the Auriferous Ore from Castromil Deposit: A ...

It became clear that the process depends on the concentrations of ammonia, thiosulfate and copper. Based on this fact, a few leaching tests were performed in order to assess the best reagent prescription, and also the effects of different combination of these concentrations. Higher thiosulfate concentrations cause the decrease of gold dissolution.

WhatsApp:+8617329420102

How you can Leach Gold Ore With Chlorination

Sep 21, 2021Direct hypochlorite leaching resulted in gold recovery of 23.0 % in 4 hours and 72.7 % in 24 hours. After pre-oxidation and subsequent leaching with hypochlorite, the recovery was 80.2 % and 98.8 % in 4 and 24 hours, respectively. After ultrasonic treatment, the gold extraction was 36.7-66.5 % in 4 hours of agitation.

WhatsApp:+8617329420102

Topic 3: Ore processing and metal recovery - SlideShare

1. Topic 3: Ore processing and metal recovery From a series of 5 lectures on Metals, minerals, mining and (some of) its problems prepared for London Mining Network by Mark Muller mmuller.earthsci@gmail 24 April 2009. 2.

WhatsApp:+8617329420102

process for the recovery of gold from an ore in chloride

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 leach (CICL).

WhatsApp:+8617329420102

gold dressing agent leaching agent lv jin for mining - Alibaba

1.Application Scope of Wangpai ①Applicable ore types: golden and silver oxidized ore, primary ore, high-sulfur and high-arsenic gold ore, cyanidation slag, gold concentrate, pyrite cinder and anode mud etc; ②Applicable beneficiation process: dump leaching,pool leaching and carbon pulp (agitation leach) etc. 2.

WhatsApp:+8617329420102

Chlorine leach of refractory gold ore | & Metal ...

Sep 29, 2020The ore was roasted at 650 degrees C for half an hour and cooled before it was submerge with acid mix. Kept it in for 4 hours and adding 15ml sodium hypochlorite every 20 minutes to keep oxidation at 1100mV. No heat added. Precipitated with metabisulfide mixed in water. Solution was a nice yellow and turned dark blood orange and back to yellow.

WhatsApp:+8617329420102

Physikochemical Bases of "Green" Technology of Gold Mining ...

Keywords: leaching of gold, organic acids, ore dressing, sodium hypochlorite I. Introduction In this paper, we report on the results of our 11-year research (2009 - 2021) devoted to the development of an integrated waste-free (low-waste) technology for processing minerals containing non-ferrous and precious

WhatsApp:+8617329420102

Leaching of gold-containing ores with application of oxidation ... - KIMS

oxidation activators. The gold recovery degree was 77.3% with direct gravity concentrate cyanidation, and 85.7% with preliminary oxidation using calcium hypochlorite increasing the gold recovery degree by 8.4%, when leaching the gravity tailings using calcium hypochlorite -73.1%, sodium peroxide - 75.6%, Ascor oxidation activator (AS-45102 ...

WhatsApp:+8617329420102

Hypochlorite Leaching Of Gold Ore - HeNan Mining Heavy Industries Co., Ltd.

Hypochlorite Leaching Of Gold Ore An oxide gold ore was subjected to chloride hypochlorite leaching at room temperature concentration and HCl concentration on gold leaching performance were investigated kinetics taking twice the time 46 h to achieve maximum gold recovery of 58 compared to sodium hypochlorite Read More

WhatsApp:+8617329420102

Leaching of an oxide gold ore with chloride/hypochlorite solutions

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 gold leaching performance were investigated. Due to formation of CaOCl + complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice ...

WhatsApp:+8617329420102

ore beneficiation hypochlorite

ore beneficiation hypochlorite PLS fill the form carefully, so that we can draft the solution and quote the price to you quickly. Application* Crushing Mobile Crush Sand Making Grinding Capacity >50 TPH >30 TPH >10 TPH <10 TPH Get a Quotation

WhatsApp:+8617329420102

Hydrometallurgy 2008: Proceedings of the Sixth International Symposium ...

Hydrometallurgy 2008 proudly takes its place as the most up-to-date, comprehensive book published in this field. Following the tradition of the previous international symposiums, this resource tackles the newest in primary and secondary resource recovery with sections on environmental hydrometallurgy, research and industrial applications, base and precious metals, and leaching.Case histories ...

WhatsApp:+8617329420102

What is involved in the gold leaching test?

The leaching of gold ore requires a pretreatment agent selection test. The pretreatment agents are mostly calcium peroxide, sodium hypochlorite, sodium peroxide, hydrogen peroxide, citric acid, lead nitrate, etc. Normally, the leaching effect after pretreatment will be compared with the conventional case without adding pretreatment agent. ...

WhatsApp:+8617329420102

The leaching kinetics of gold from gold scraps in Cl2-saturated HCl ...

Baghalha M. "Leaching of an oxide gold ore with chloride/hypochlorite solutions". International Journal of Mineral Processing, 82, 178-186. 2007. Kozin LF, Prokopenko V, Bogdanova AK. "Kinetics and mechanism of the gold corrosion dissolution in hypochlorite solutions". Protection of Metals, 41(1), 22-29, 2005.

WhatsApp:+8617329420102

How To Separate Gold From Ore After Crushed

gold recovery efficiency from operating heap leaches is typically 70, although it can range from 50 to 90. silver recovery efficiency is typically 55. most gold heap leaches apply cyanide within a range of 200600 mg/l nacn. silver-bearing ores should usually be leached with a cyanide level of 6001000 mg/l nacn., (pdf) gold extraction and recovery .

WhatsApp:+8617329420102

Gold Recovery of Refractory Sulfide Concentrates Using Direct ... - Esdm

reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a 2.5-liter glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the prescribed concentration of reagents.

WhatsApp:+8617329420102

WO2013152424A1 - Chloride process for the leaching of gold - Google

A process for the extraction of gold from a gold-bearing ore or concentrate, comprising the steps of leaching the gold-bearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90°C and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent ...

WhatsApp:+8617329420102

The Cyanide Heap Leaching Behavior of Cupriferous Gold Ores

To develop a fundamental understanding of cyanide heap leaching of low-grade gold ores, with significant copper mineralization, two sets of column leach tests were operated under two different leaching solutions. In one set, four 1.5 m tall column tests were leached with sodium cyanide solution. In the second set, another four columns were

WhatsApp:+8617329420102

Digital Archives @ UP Diliman

The process is capable of both dissolving the old and oxidizing the ore, which removes the "refractory" nature of the ore. In this study, a two stage leaching process has been proposed and conducted. The first stage consists of oxidation using hypochlorite-bearing reagents at alkaline conditions for 3 hours. Solution pH is then lowered for the ...

WhatsApp:+8617329420102

Related Posts

Solve the problem?
Get the latest quotation? Hit The Button.

Online Service