refractory gold ore leaching

refractory gold ore leaching

US4559209A - Leaching refractory gold ores - Google Patents

A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

More

Leaching refractory gold ores – Gold Metallurgy

Apr 02, 2016  In general, refractory gold ores may be treated in a number of ways and over the past few years, 5 approaches have been taken, all with varying degrees of success depending on the ore. ... As shown, pressure leaching gives high gold recoveries from a variety of ore types, whilst direct leaching variable poor recoveries. ...

More

Refractory Gold Ore Treatment Methods

Jul 14, 2016  Metallurgical ContentGold Leaching Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and

More

Improving the gold leaching process of refractory ores ...

A reactor to improve the leaching kinetics of refractory gold ores.. The Jetleach reactor is designed to propagate micro-cavitation in a chamber filled with oxygen. This reactor can improve the gold recovery while decreasing the leaching time. The Jetleach is a potential solution to the cyanidation problems of refractory ores.

More

Ammoniacal thiosulfate leaching of refractory oxide gold ore

Jul 10, 2017  Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au.Moreover, X-ray diffraction analysis and mineralogical studies using polished thin sections showed that the ore was composed of quartz, epidote, muscovite, and ...

More

CYANIDE LEACHING BEHAVIOR OF AN ARSENIC RICH

REFRACTORY GOLD ORE Büyüktanır, Karden M.S., Department of Mining Engineering Supervisor: Assoc. Prof. Dr. N. Emre Altun February 2017, 113 pages In this work, the possibility of gold extraction using cyanide leaching from a refractory type gold ore, particularly rich in arsenic minerals of realgar and orpiment, was assessed.

More

The Leachox™ Refractory Gold Process – The Testing, Design ...

The Problem of Refractory Ores . Refractory gold ores are generally defined as those ores that do not give economical recoveries in conventional cyanide circuits where the ore has been ground to around 53 to 75 microns. There are several reasons as to why an ore may be refractory

More

Options to Treat Refractory Ores - Albion Process

Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring ‘preg robbing’ carbonaceous materials or gold physically ‘locked’ in sulphide minerals. ...

More

INVESTIGATION OF THE AMENABILITY OF A COPPER-RICH ...

refractory gold ore to cyanide leaching was investigated. The effect of H 2 SO 4 pretreatment for reactive copper removal on the gold extraction in the subsequent cyanide leaching was examined. Effect of cyanide concentration in the range of 1-8 g/L NaCN was also tested on the cyanide

More

Recovery of gold from refractory gold ores: Effect of ...

高达10%返现  Apr 05, 2021  The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the thiourea

More

Leaching Guide of Refractory Gold Ore - cnlitereagent

Feb 28, 2020  1.What Is Refractory Gold Ore? With the development of beneficiation , the definition of refractory gold ore is changing. Generally speaking, refractory gold ore in leaching field is a kind of ore whose leaching rate of gold is less than 80% when directly processed by cyanidation after find grinding.

More

Leaching refractory gold ores – Gold Metallurgy

Apr 02, 2016  In general, refractory gold ores may be treated in a number of ways and over the past few years, 5 approaches have been taken, all with varying degrees of success depending on the ore. ... As shown, pressure leaching gives high gold recoveries from a variety of ore types, whilst direct leaching variable poor recoveries. ...

More

Diagnostic Leaching For Refractory Gold Ores SRK Consulting

A diagnostic leach test can be very useful to qualitatively assess how gold occurs within the ore and the extent to which it may be refractory. Several different permutations of diagnostic leach tests depend on specific objectives, but they generally involve the sequential leaching of a gold ore sample with progressively stronger reagents ...

More

Improvement of Gold Leaching from a Refractory Gold ...

curing–water leaching 1. Introduction Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight

More

Diagnostic Leaching for Refractory Gold Ores

A diagnostic leach test can be very useful to qualitatively assess how gold occurs within the ore and the extent to which it may be refractory. Several different permutations of diagnostic leach tests depend on specific objectives, but they generally involve the sequential leaching of a gold ore sample with progressively stronger reagents, producing a qualitative assessment of the

More

Processing Refractory Gold - Hydrometallurgy: Leaching in ...

Refractory ores are normally have either a high sulfide content that masks the gold preventing cyanide leaching of the gold, or high organic content that also block gold leaching (reabsorbs the gold), or it can have a high clay content that also soaks up the cyanide.

More

Optimization Process of the Refractory Gold Ore Extraction ...

Jan 08, 2021  Hypochlorite leaching system is a strong oxidizing solution for metal sulfides, which are naturally associated with gold extraction. This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method–central composite design (RSM-CCD) as a statistical approach in determining the optimum condition of gold extraction

More

Refractory Gold Technology

Refractory Gold Technology Sherritt’s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks. Many gold ores and concentrates contain fine grained gold locked within sulphide minerals, such as pyrite and/or arsenopyrite, unavailable for recovery by conventional leaching. In Sherritt’s gold process, the ...

More

(PDF) Cyanidation of Refractory Gold Ores: A Review

Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide leaching circuits, even when the ore is finely ground. ...

More

Types of refractory gold deposits - Fodamon Machinery

The so-called refractory gold ore refers to the ore and concentrate that can not obtain satisfactory leaching rate by direct extraction of gold by traditional cyanidation under normal grinding conditions. It is also called refractory gold ore or refractory gold ore.

More

Ammoniacal thiosulfate leaching of refractory oxide gold ore

Jul 10, 2017  Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au.Moreover, X-ray diffraction analysis and mineralogical studies using polished thin sections showed that the ore was composed of

More

Evaluation of Refractory Behaviour of Kaletaş (Turkey ...

Gold ores can be broadly categorized as "free milling" and "refractory" depending on their response to cyanide leaching (La Broy, 1994, Gunyanga et al, 1999) A gold recovery of >90% can be readily achieved with a conventional cyanide leaching of free milling ores (Rubisov et al, 1996) However, refractory gold ores are often

More

Recovery of gold from refractory gold ores: Effect of ...

Apr 05, 2021  The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the

More

The Leachox™ Refractory Gold Process – The Testing, Design ...

The Problem of Refractory Ores . Refractory gold ores are generally defined as those ores that do not give economical recoveries in conventional cyanide circuits where the ore has been ground to around 53 to 75 microns. There are several reasons as to why an ore may be refractory. The two most common are: -

More

Diagnostic Leaching for Refractory Gold Ores

A diagnostic leach test can be very useful to qualitatively assess how gold occurs within the ore and the extent to which it may be refractory. Several different permutations of diagnostic leach tests depend on specific objectives, but they generally involve the sequential leaching of a gold ore sample with progressively stronger reagents, producing a qualitative assessment of the

More

Diagnostic Leaching For Refractory Gold Ores SRK Consulting

A diagnostic leach test can be very useful to qualitatively assess how gold occurs within the ore and the extent to which it may be refractory. Several different permutations of diagnostic leach tests depend on specific objectives, but they generally involve the sequential leaching of a gold ore sample with progressively stronger reagents ...

More

Improvement of Gold Leaching from a Refractory Gold ...

curing–water leaching 1. Introduction Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25% was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight

More

Leaching of Refractory Gold Ores by Microwave Irradiation ...

Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of

More

Ultrasound-intensified Leaching of Gold from a Refractory Ore

ore for over 120 years. Gold ores can be classified as free milling, complex, or refractory based on gold recovery achievable by direct cyanidation.1) High gold recoveries from free-milling gold can easily be obtained by conven-tional cyanide leaching.2) Refractory gold ores have the low gold extractions by the cyanidation and are arsenopyrites

More

Ammoniacal thiosulfate leaching of refractory oxide gold ore

Jul 10, 2017  Ammoniacal thiosulfate leaching of refractory oxide gold ore was investigated. According to X-ray fluorescence and fire assay analyses, the ore contained about 33.01 wt% Si, 8.53 wt% Al, 7.26 wt% K, 3.00 wt% Fe, and 2.80 ppm Au.Moreover, X-ray diffraction analysis and mineralogical studies using polished thin sections showed that the ore was composed of

More

Barrick Thiosulfate Leaching of Double Refractory Ore

mining. Double refractory ores are ores that contain sulfides and carbons, as opposed to single refractory ores which contain only sulfides. In general, the cyanide solution pulls the gold out of the ore and into solution. However, when the standard cyanide leaching solution is used to recover gold from double refractory ores instead of single ...

More

Chlorine leach of refractory gold ore Gold Refining ...

Mar 02, 2021  I have a problem. I used 35% hydrochloric acid and 15% sodium hypochlorite acid on a roasted refractory gold ore directly. The 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...

More

Evaluation of Refractory Behaviour of Kaletaş (Turkey ...

Gold ores can be broadly categorized as "free milling" and "refractory" depending on their response to cyanide leaching (La Broy, 1994, Gunyanga et al, 1999) A gold recovery of >90% can be readily achieved with a conventional cyanide leaching of free milling ores (Rubisov et al, 1996) However, refractory gold ores are often

More

BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR

FOR GOLD RECOVERY FROM REFRACTORY ORES In this article, pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite. There are two methods of bacterial leaching, namely stirred reactor bio-leaching and bio-heap leach processes. The examples of

More

Gold recovery: Effect of ozonation on refractory gold ores ...

Cyanidation has been the standard method used to leach gold ore and recover gold since 1890 (Adams, 2016). As free milling ores are depleting, the focus has shifted to gold ores that do not yield economic recoveries after conventional cyanidation and these ores are classified as refractory ores. An ore can be

More

Flowsheet development of a refractory gold ore to minimise ...

The bulk concentrate is then subjected to ultrafine grinding, ahead of cyanide leaching. This paper follows the development path and lessons learned through this case study, particularly in maximising recovery over time. CITATION:Connelly, D, 2019. Flowsheet development of a refractory gold ore to minimise arsenic issues in the environment, in ...

More

The Metallurgy of Cyanide Gold Leaching – An Introduction ...

Oct 20, 2014  Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates. Despite the difficulties and hazards of working with cyanide, no other process has yet been proven to be an economic viable alternative. ... Refractory Ores/Solid-Solution Gold: In some ores, Au ...

More