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Refractory Gold Processes - Mineral Processing & Metallurgy

Gold can be leached and extracted/recovered in several ways. Even if you gold is "refractory" in pyrite or arsenopyrite, you can still get much value from your ore/rock depending on the economics of capital and operating cost. The cheapest and fastest option is to simply grind and CIL the whole thing according the the process flowsheet here shown. The next option, once you have confirmed ...

Process simulation and gate-to-gate life cycle assessment ...

Dec 26, 2019· In the state-of-art industry, refractory gold ore is pre-treated prior to cyanidation to liberate the gold (La Brooy et al. 1994; Fraser et al. 1991).Known pretreatment methods are roasting (Hammerschmidt et al. 2016), pressure oxidation, (POX) (Mason et al. 1985; Thomas et al. 1990; Pangum and Browner 1996; Marchbank et al. 1996) and bioleaching (Iglesias and Carranza 1994; …

pretreatment of refractory gold ore

The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb 9 Sb 22 S 42) and andorite (Sb 3 PbAgS 6).The ...

Gold extraction - QueensMineDesignWiki

The process options for oxygen consuming ores are thus to use alkaline pre-oxidation, or aeration and flotation, followed by a cyanide leach with oxygen addition. Preg-Robbing Complex Ores. Preg-robbing occurs when a gold cyanide complex is removed from solution by some component of the ore.

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

In the heat, using alkaline air oxidation method is easier to complete alkaline pre-oxidation for pyrrhotite, so makes gold easier to cyanide and leach. 4. Telluride and sulfur-salt gold ore

Alkaline leaching pretreatment and cyanidation of ...

It was also found that pretreatment only in highly alkaline media (pH > 13) can be effective in gold recovery. Gold and silver extractions during subsequent cyanidation were improved from 69.4 to 80.7% for gold and 44.4 to 88.9% for silver, where the extraction yields of arsenic, iron, and zinc were 93.7, 75.9, and 26.9%, respectively.

10.1016/j.mineng.2005.09.052 | DeepDyve

Jun 11, 2020· Purging with nitrogen reduced the oxidation kinetics and Purging with oxygen did not affect the oxidation rate when compared with those open to the atmosphere. The results of alkaline pre-oxidation and gold leaching by cyanidation suggested that the alkaline pre-oxidation was an effective treatment for the refractory gold ore.

Extraction of Gold from a Low-Grade Double Refractory Gold ...

The concentrate from the flotation procedure was processed using different preoxidation methods. A concentrate containing 34.08g/t of gold with the gold recovery ratio of 81.20% was obtained by flotation. After roasting, microwave heating or alkaline pressure oxidation, the gold cyanidation ratio reached 82.37%, 81.26% and 71.09% respectively.

Optimizing the alkaline oxidation pretreatment of a ...

Pre-oxidation by ozone and ferric ions in acidic media: Gold extraction from a high-sulfur and high-arsenic refractory gold concentrate after pre-oxidation under optimum conditions dramatically improved from 19.5% of direct cyanide leaching to 96.5%. Fomchenko et al : Two-stage bacterial–chemical oxidation

ALTA Gold 2012 E-Doc - 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. ... To render gold 'locked' in the sulphide mineral amenable to cyanidation a chemical pre-treatment is ... determined by the reaction conditions which range from mild in alkaline leaching and ...

EDTA-enhanced cyanidation of refractory bio-oxidised ...

1. Introduction. Biological oxidation (BIOX®) of ores and concentrates containing auriferous sulphide minerals (FeS 2, FeAsS), using chemolithotrophic bacteria, liberates occluded gold (Au), by direct and/or indirect reactions, and enhances gold cyanidation efficacy of otherwise complex, refractory ores (Marsden and House, 2006; Miller and Brown, 2016).

REFRACTORY GOLD - PanTerra Gold

REFRACTORY GOLD. By definition, refractory gold ores contain gold that is resistant to extraction by conventional chemical processing and as a result responds poorly to traditional gold cyanidation techniques such as Carbon-in-Leach (CIL), yielding less than 80% of the contained gold.

Cyanide Leaching Chemistry & Gold Cyanidation

This gold is not only refractory to cyanidation, it is also difficult to amalgamate, and difficult to float by the usual reagents used in flotation. Occasionally, panning of a cyanidation residue and examination by microscope shows bright metallic particles somewhat lighter in color than clean gold.

Atmospheric alkaline pre-oxidation of refractory sulphide ...

DOI: 10.14288/1.0366302 Corpus ID: 139611489. Atmospheric alkaline pre-oxidation of refractory sulphide gold ores @inproceedings{Rego2018AtmosphericAP, title={Atmospheric alkaline pre-oxidation of refractory sulphide gold ores}, author={Alan Joseph Rego}, year={2018} }

Atmospheric alkaline pre-oxidation of refractory sulphide ...

Four iron-sulphide-containing gold ores from the White Mountain mine in the Jilin Province, China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold. This pre-treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11 throughout the test. Three ...

Pretreatment Using Alkaline Sulfide Leaching and Nitrogen ...

pretreatment using alkaline sulfide leaching and nitrogen species catalyzed pressure oxidation on a refractory gold concentrate corby g. anderson, phd

Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite Ores

ALKALINE OXIDATIVE LEACHING OF GOLD-BEARING ARSENOPYRITE ORES By P. Bhakta,1 J. W. Langhans, Jr.,1 and K. P. V. Lei2 ABS"rRACT The U.S. Bureau of Mines developed an alkaline oxidative pretreatment leaching procedure to increase the recovery of gold from arsenopyrite (FeAsS) ores. The best solution compositions for

Optimizing the alkaline oxidation pretreatment of a ...

This study investigates the alkaline oxidation pretreatment process of Zarshuran refractory gold ore. Taguchi method-orthogonal array design (OAD) is applied to evaluate and optimize the influence ...

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

Conventional grinding and cyanide leaching of refractory ores results in incomplete gold recoveries, as a solution, a pre-treatment process should be implemented. Various pre-treatment, methods includes roasting, bio- oxidation, high-pressure cyanide leaching and pressure oxidation. With the development of new ozone generators, that

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 ...

OXIDATION OF REFRACTORY GOLD CONCENTRATES AND …

ammonia. The leaching experiments also have shown that gold may dissolve in alkaline thioarsenite solutions, which provides a possible new process option for the leaching of gold. The oxidation of refractory arsenical gold concentrates in aerated alkaline solutions results in the formation of thiosulfate, arsenate and sulfate as well as the

OXIDATION OF REFRACTORY GOLD CONCENTRATES AND …

The oxidation of refractory gold concentrates containing arsenopyrite and pyrite and the simultaneous dissolution of gold in aerated alkaline solutions at ambient temperatures and pressures without the addition of cyanide has been studied.

Refractory Gold Ore Treatment Methods

At the plant of the Consolidated Murchison Co. in the Transvaal, South Africa, where a refractory high-antimony gold ore is being treated, flotation and cyanidation of the flotation concentrates and tailings are being practiced. The association of the antimony and gold is very intimate, and during 1946, while the antimony recovery amounted to ...

(PDF) Alkaline Pressure Oxidation of a Gold-Bearing ...

Alkaline pressure oxidation is an effective pretreatment for releasing refractory gold from arsenical concentrates prior to cyanidation. Alkaline conditions permit the use of

Improvements in gold ore cyanidation by pre-oxidation with ...

Pre-oxidation with H 2 O 2 prior to cyanidation increased DO from 1 up to 7.2 ppm.. H 2 O 2 was injected at a rate of 0.24 kg H 2 O 2 /t of dry ore prior to cyanidation.. NaCN consumption was reduced from 0.52 to 0.40 kg/t. • Au recovery was increased from average 91.3 to 92.5%.

A fundamental study of the alkaline sulfide leaching of gold

One of the problems with the partial oxidation of the sulfide host matrix to form elemental sulfur is that sulfur containing streams are difficult to treat using cyanidation. In the present paper, the alkaline sulfide system was studied as an alternative to cyanide for recovering gold …

The influence of pyrite pre-oxidation on gold recovery by ...

The influence of pyrite pre-oxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been investigated with the aid of electrochemical measurements, leaching experiments, and direct analysis of reaction products for selected residues.

Improvements in gold ore cyanidation by pre-oxidation with ...

The influence of pyrite pre-oxidation in alkaline solutions on gold recovery by cyanidation from Twin Creek refractory gold ore in which pyrite was identified as the major sulfide mineral has been ...