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ammonia leaching gold

Dec 10 2013 · Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost easy recovery and high selective recovery of metals New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching have resulted in a


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Ammonia Leach Solution  Gold Adsorption on Activated
Ammonia Leach Solution Gold Adsorption on Activated

In order to establish the mechanism of the adsorption of gold ammine on to activated carbon the current investigation was conducted The activated carbon used was granular particle with particle size of 820 mesh The average surface area of the activated carbon was determined to be about 790 m²g by a N2 adsorption technique with the BET method

Ammoniacal thiosulphate leaching of gold ore
Ammoniacal thiosulphate leaching of gold ore

effect of ammonia effect of cupric ions and few other variables affecting the gold leaching have been studied The ammoniacal thiosulphate leaching of gold is dependant on both ammonia and thiosulphate concentration The leaching is improved significantly at a particular ratio of ammonia

Palladium Leaching in Ammonia
Palladium Leaching in Ammonia

Recently a number of techniques of recovering Palladium have been developed For example leaching of platinum group metals from spent automobile catalytic converters using halogen salt with oxygen was developed Ammonia is an inexpensive lixiviant used in leaching precious metals such as silver and gold Since palladium has some similar chemical properties to silver it is believed that

Thiosulfatecopperammonia leaching of pure gold and
Thiosulfatecopperammonia leaching of pure gold and

In thiosulfate gold leaching Cu2 ions are commonly used as oxidizing agents while the thiosulfate ion acts as a ligand forming a soluble gold thiosulfateammonia complex Aylmore and Muir 2001 It was suggested that gold leaching in the absence of Cu2 ions with

TREATMENT OF A COPPER  RICH GOLD ORE BY
TREATMENT OF A COPPER RICH GOLD ORE BY

Paper No 394 TREATMENT OF A COPPER RICH GOLD ORE BY AMMONIA ASSISTED CYANIDE LEACHING A D Bas 1 E Y Yazici 2 and H Deveci 3 ABSTRACT Copper minerals present difficulties during the cyanide leaching of gold ores leading to excessively

Ammoniacal thiosulfate leaching of refractory oxide gold
Ammoniacal thiosulfate leaching of refractory oxide gold

Jul 10 2017 · Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated According to Xray fluorescence and fire assay analyses the ore contained about 3301 wt Si 853 wt Al 726 wt K 300 wt Fe and 280 ppm Au

PDF Ammoniacal thiosulphate leaching of gold ore
PDF Ammoniacal thiosulphate leaching of gold ore

Ammoniacal thiosulphate leaching of gold finds a better substitute as it is nontoxic and environmentally safe as compared to the toxic cyanide system for gold extraction effect of ammonia

US5114687A  Ammonia extraction of gold and silver from
US5114687A Ammonia extraction of gold and silver from

Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia ammonium salts and one or more oxidants The process is particularly effective for refractory gold ores including sulfide and carbonaceous ores

Gold cyanidation  Wikipedia
Gold cyanidation Wikipedia

Gold cyanidation also known as the cyanide process or the MacArthurForrest process is a hydrometallurgical technique for extracting gold from lowgrade ore by converting the gold to a watersoluble coordination complex It is the most commonly used leaching process for gold extraction

TREATMENT OF A COPPER  RICH GOLD ORE BY
TREATMENT OF A COPPER RICH GOLD ORE BY

Paper No 394 TREATMENT OF A COPPER RICH GOLD ORE BY AMMONIA ASSISTED CYANIDE LEACHING A D Bas1 E Y Yazici2 and H Deveci3 ABSTRACT Copper minerals present difficulties during the cyanide

How to Use Bleach on Gold Ore to Remove Gold  Sciencing
How to Use Bleach on Gold Ore to Remove Gold Sciencing

Apr 24 2017 · Allow four hours for the gold to dissolve stirring every 20 minutes The chlorine reacts with the gold inside the ore to form gold chloride Filter the ore and bleach solution to remove all the impurities such as soil and rock fragments Collect the filtered gold chloride solution in a flask

US5114687A  Ammonia extraction of gold and silver from
US5114687A Ammonia extraction of gold and silver from

Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia ammonium salts and one or more oxidants The process is particularly effective for refractory gold ores including sulfide and carbonaceous ores

The Principles and Applications of Ammonia Leaching of
The Principles and Applications of Ammonia Leaching of

EhpH diagrams of various metalammoniawater systems are presented Also presented is a comprehensive literature survey on the leaching behavior of metals in ammoniacal solutions The metals considered in this paper are copper cobalt nickel zinc cadmium silver gold and palladium

Treatment of copperrich gold ore by cyanide leaching
Treatment of copperrich gold ore by cyanide leaching

High gold extractions coupled with considerably reduced levels of cyanide consumption suggest that ammonia leaching as a pretreatment process prior to cyanidation can be suitably used for copperbearing refractory gold ores In ammonia leaching pH and free NH 3 concentration are important parameters controlling the dissolution process in which

A review of the selective leaching of gold from oxidised
A review of the selective leaching of gold from oxidised

The ammonia–cyanide leach system was first patented over 100 years ago and stands out as a unique method of selectively leaching up to 90 Au and 1 Cu from oxidised copper–gold ores using 10 NaCN used in conventional cyanidation processes

Leaching metallurgy  Wikipedia
Leaching metallurgy Wikipedia

Drawbacks of leaching include its lower efficiency and the often significant quantities of waste effluent and tailings produced which are usually either highly acidic or alkali as well as toxic eg Red mud There are four types of leaching Cyanide leaching eg gold ore Ammonia leaching eg Crushed ore Alkali leaching eg bauxite ore

Thiosulfate leaching of goldA review  ScienceDirect
Thiosulfate leaching of goldA review ScienceDirect

Thiosulfate leaching can be considered a nontoxic process the gold dissolution rates can be faster than conventional cyanidation and due to the decreased interference of foreign cations high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceoustype ores In addition thiosulfate can be cheaper than cyanide

US5308381A  Ammonia extraction of gold and silver from
US5308381A Ammonia extraction of gold and silver from

Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia ammonium salts and one or more oxidants The process is particularly effective for refractory gold ores including sulfide and carbonaceous ores

THIOSULPHATE LEACHING – AN ALTERNATIVE TO
THIOSULPHATE LEACHING – AN ALTERNATIVE TO

THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide Although not as aggressive a leaching agent as cyanide thiosulphate offers several technological

COPPERII EXTRACTION FROM AMMONIA LEACH
COPPERII EXTRACTION FROM AMMONIA LEACH

Ammonia leaching of sulfide copper concentrates generate buffer type liquors pH ranges from 9 to 10 because of the excess of ammonia and significant amount of ammonia sulfate as a leaching agent Metals such as Cu Ni Co and Zn occur in ammonia systems as a cationic amminacomplexes Alkalinity of the solution and free

Kinetic Investigation and Dissolution Behavior of Cyanide
Kinetic Investigation and Dissolution Behavior of Cyanide

May 10 2019 · For gold extraction usually ammonium or sodium thiosulfate salts are used in an ammoniacopper leaching solution Copper sulfate acts as a catalyst while ammonia

Thiosulphate DroppedTesting for PM  Page 2  Gold
Thiosulphate DroppedTesting for PM Page 2 Gold

Jan 11 2012 · the pyrite may hold considerable portion of gold locked up in its crystal bondbesides free gold this cold be a major portion of your gold in these pyrite bonds and should be DECOMPOSED broken down before leaching to me this means to roast ore PRETREATMENT and break sulfide pyrite bond with gold if ammonia and copper is maintained in proper

How to Use Bleach on Gold Ore to Remove Gold  Sciencing
How to Use Bleach on Gold Ore to Remove Gold Sciencing

Apr 24 2017 · Allow four hours for the gold to dissolve stirring every 20 minutes The chlorine reacts with the gold inside the ore to form gold chloride Filter the ore and bleach solution to remove all the impurities such as soil and rock fragments Collect the filtered gold chloride solution in a flask

A Review of Ammoniacal Thiosulfate Leaching of Gold An
A Review of Ammoniacal Thiosulfate Leaching of Gold An

The factors affecting gold leaching such as pH temperature and oxidants in leaching solutions reagent concentrations and foreign ions are presented to update the current understanding on gold dissolution in a CuIINH 3S 2 O 3 2system KEYWORDS Ammonia copperII gold leaching

Kinetic Investigation and Dissolution Behavior of Cyanide
Kinetic Investigation and Dissolution Behavior of Cyanide

May 10 2019 · For gold extraction usually ammonium or sodium thiosulfate salts are used in an ammoniacopper leaching solution Copper sulfate acts as a catalyst while ammonia

Gold recovery from waste mobile phones PCBs using
Gold recovery from waste mobile phones PCBs using

Gold recovery from waste mobile phones PCBs using ammonia thiosulphate leaching and copper cementation process by Ramphagane Frank Nchabeleng Thesis submitted in fulfillment of the requirements for the degree Master of Engineering Chemical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology

Leaching of Gold from the Waste Mobile Phone Printed
Leaching of Gold from the Waste Mobile Phone Printed

Leaching of Gold from the Waste Mobile Phone Printed Circuit Boards PCBs with Ammonium Thiosulphate Literature reveals that only limited studies have been carried out to recover the metals from waste mobile phonePCBs Ammonium thiosulfate NH 4 2 S 2 O 3 is a leachant which is nontoxic as well as economical It works to stabilize gold as

Cyanide Gold Extraction Process  JXSC Machine
Cyanide Gold Extraction Process JXSC Machine

Dec 20 2018 · Cyanide gold extraction process the process of extracting gold with cyanide is called cyanidation gold extraction which is the main method for extracting gold from ore or concentrate Basic Gold Cyanide Process Steps The cyanidation gold extraction process includes cyanide leaching washing and leaching of the leaching slurry extraction of gold from the cyanide or cyanide slurry

Ammonia extraction of gold and silver from ores and other
Ammonia extraction of gold and silver from ores and other

May 19 1992 · Gold is associated with sulfide minerals such as pyrite arsenopyrite and antimonybearing sulfides The straight cyanidation yielded a mere 60 gold recovery after 24 hours of leaching A number of tests using ammonia were carried out over the range of chemical conditions specified below The leaching conditions employed were

Fundamental aspects of gold leaching in thiosulfate
Fundamental aspects of gold leaching in thiosulfate

The kinetics and mechanism of gold leaching in the ammoniathiosulfatecopper ATSCu system have been studied using the rotating electrochemical quartz crystal microbalance REQCM Anodic polarization cathodic polarization and leaching experiments were included in this study

Alternative lixiviants to cyanide for leaching gold ores
Alternative lixiviants to cyanide for leaching gold ores

Ammonia leaching of gold in the presence of an oxidant is carried out at temperatures between 100 and 3001C and 600–1000 kPa of pressure using 5–10 gL copperII as oxidant 55 M free ammonia and 05 M ammonium sulfate Leaching times are short around 1–4 h

US6632264B2  Gold recovery from thiosulfate leaching
US6632264B2 Gold recovery from thiosulfate leaching

Processes for recovering gold from coppergold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed The processes include subjecting the goldbearing and copperbearing thiosulfate solution to a pH andor temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an

Ammonia Leaching as a PreTreatment for the
Ammonia Leaching as a PreTreatment for the

Both column leaching of whole ore and batch stirred tank reactor leaching of milled ore were investigated as pretreatment methods for varying length of process times and

Ammonianitric Acid Leaching of Copper Cobalt
Ammonianitric Acid Leaching of Copper Cobalt

Ammonia leaching is also selective in that it will not dissolve all available nonspecific metals such as iron and manganese along with the copper or cobalt as sulphuric acid does More Ammonia leaching can be used in nonoxidative oxidative and reductive leaching 5 The authors in 6 have reached 80 efficiency of copper

Leaching metallurgy  Wikipedia
Leaching metallurgy Wikipedia

Drawbacks of leaching include its lower efficiency and the often significant quantities of waste effluent and tailings produced which are usually either highly acidic or alkali as well as toxic eg Red mud There are four types of leaching Cyanide leaching eg gold ore Ammonia leaching eg Crushed ore Alkali leaching eg bauxite ore

copper scrap leaching ammonia
copper scrap leaching ammonia

Ammonia leaching can be used in nonoxidative oxidative and reductive leaching 16 The ammonia leaching process is more environment friendly than conventional acid heap leaching which uses sulphuric acid to dissolve copper and cobalt 11 The reported difficulty encountered with the ammonia leaching approach however Chat With Sales

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