+86 0371 8654 9132

of refractory sulphide gold ores and concentrates

Pressure Oxidation of a Refractory Sulfide Concentrate

Aug 11, 2018 · Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade. In sulfide ores, pyrite is the most

About this site

Methods of Processing the Gold-Containing Refractory Sulfide Ores and the Concentrates 69 Bull. Georg. Natl. Acad. Sci., vol. 11, no. 1, 2017 results of the study showed [6] that a high degree of extraction of precious metals is achieved after pre-oxidizing roasting of the residues at temperatures of 600 – 7000C for 1 hour, after which the ...

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

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.

Gold Extraction from Refractory Sulfide Gold Concentrates ...

Aug 25, 2021 · 高达10%返现 · Rees K, van Deventer J (2000) Preg-robbing phenomena in the cyanidation of sulphide gold ores. Hydrometallurgy 58:61–80. CAS Article Google Scholar 8. Suratman S (2017) Gold recovery of refractory sulfide concentrates using direct cyanide leaching with nitrite as an oxidant. Indones Min J 19:153–165

Effect of Pretreatment of Sulfide Refractory Concentrate ...

Keywords: Refractory Gold Concentrate; Hypochlorite Ox idation Pretreatment; Pressure Cyanidation . 1. Introduction . 1.1. Background . Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to

About this site

Biooxidation of sulfidic refractory gold ores Rupert Kirchner, BSc Paper conducted in November 2015 Abstract The past years have confirmed that Biooxidation is a viable technology which is used commercially to treat certain refractory sulfide gold concentrates. There are several processes applied to achieve the oxidation of the sulfidic ...

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 ...

About this site

Apr 01, 2021 · Sulfide gold ores account for a large proportion of refractory gold ores, therefore, it is very meaningful to recover gold from sulfide gold ores (Ubaldini and Vegliò, 2000, Saba, 2011, Hammerschmidt, 2016). Moreover, the major gold leaching process for extracting gold from ores and concentrates is still cyanide leaching.

Refractory Gold Ore Treatment Methods

Jul 14, 2016 · The initial plant had a capacity of 28 t/h of sulfide concentrates and has reportedly been expanded. The leachox Process is another recently developed hydrometallurgical approach to the treatment of refractory gold ores. The technology is owned and marketed by Maclgwyn Mineral Services (MMS) based in the United Kingdom.

Sulphide Gold Ore Treatment by Leaching and Flotation Process

Apr 18, 2016 · Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return.This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an ...

GOLD RECOVERY OF REFRACTORY SULFIDE

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.

Gold Extraction from Refractory Sulfide Gold Concentrates ...

Aug 25, 2021 · Rees K, van Deventer J (2000) Preg-robbing phenomena in the cyanidation of sulphide gold ores. Hydrometallurgy 58:61–80. CAS Article Google Scholar 8. Suratman S (2017) Gold recovery of refractory sulfide concentrates using direct cyanide leaching with nitrite as

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

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.

Recovery of gold from sulfide refractory gold ore ...

Apr 01, 2021 · Sulfide gold ores account for a large proportion of refractory gold ores, therefore, it is very meaningful to recover gold from sulfide gold ores (Ubaldini and Vegliò, 2000, Saba, 2011, Hammerschmidt, 2016). Moreover, the major gold leaching process for extracting gold from ores and concentrates is still cyanide leaching.

Effect of Pretreatment of Sulfide Refractory Concentrate ...

Keywords: Refractory Gold Concentrate; Hypochlorite Ox idation Pretreatment; Pressure Cyanidation . 1. Introduction . 1.1. Background . Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE

Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the

TECHNOLOGY FOR PROCESSING OF REFRACTORY GOLD

disseminated gold from the flotation concentrate resulted from processing of a refractory ore of one of Russian gold deposits. Concentrate description Gold grade of the head flotation concentrate was 29.6 g/t. The concentrate size was 80% -80 um. Mineral composition of the concentrate comprises 17% of rock-forming minerals, 59% of pyrite and 24%

Simultaneous sulfide oxidation and gold leaching of a ...

Sep 01, 2013 · Combining sulfide oxidation and gold leaching using chloride/hypochlorite solution was used for a refractory sulfide concentrate containing 20.45 g/t gold. Leaching tests at different concentrations of Ca(OCl) 2 and NaCl, and also various initial pHs were performed.

Sulphide Gold Ore Treatment by Leaching and Flotation Process

Apr 18, 2016 · Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return.This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an ...

Small Scale Treatment of PM Sulfide Ores - Gold Refining ...

Feb 15, 2020 · The ore has a 5 to 10 percent sulfide content, so I expect about 10 to 20 pounds of sulfide concentrate. Dealing with 10 to 20 pounds is a lot easier than 200 pounds. There will be some loss of values in this operation - but I accept this because although the method is less than optimal, it's the best I can put together.

Gold Ore Roasting Techniques

Jul 14, 2016 · A comprehensive description of roasting practice is to be found in a series of articles entitled “Roasting Gold-Silver Sulphide Ores and Concentrates” by M. W. von Bernewitz. A more recent paper, “ Roasting of Arsenical Gold Ores and Concentrates” by F. R. Archibald contains a bibliography listing 23 references on the subject of ...

BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR GOLD ...

FOR GOLD RECOVERY FROM REFRACTORY ORES ... sulphide concentrates is shown in Figure 1. The key components of the process involve concentration of a ground ore, usually by flotation, followed by oxidation of the gold-bearing sulphides to the required extent in a multi-stage process. Oxidized

(PDF) Fundamentals and applications of alkaline sulfide ...

As well, examples of refractory gold recovery with alkaline sulfide hydrometallurgy such as an arsenopyrite gold concentrate application, a chalcopyrite gold concentrate application, a pregrobbing gold ore application and a cyanide consuming gold ore application will be delineated in this paper.

(PDF) Refractory gold-bearing ores: a review of treatment ...

This process, which has been developed for the treatment of high-grade sulphide flotation concentrates, is proposed for the pretreatment of gold-bearing sulphide ores. 1. I N T R O D U C T I O N 1.1 Refractoriness Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine ...

Processing of refractory gold sulphide carbonbearing ores ...

In connection with the depletion of mineral resources base of gold, the engagement of refractory ores reserves in the processing becomes a necessary condition to stabilize gold market. Standard methods of processing of refractory sulphide carbon-bearing gold ores and float concentrates extracted from them include pressure oxidation and bacterial oxidation enabling the liberation of dispersive ...

Bio-oxidation of refractory gold ores containing stibnite ...

Aug 01, 2019 · In the gold industry, it competes with roasting and pressure oxidation in the treatment of refractory gold-sulphide concentrates (Mahajan et al., 2017). Refractory gold ores are those which yield less than 80% metal extraction during direct cyanidation (Ciminelli, 2005).

SIMULTANEOUS BIOTRANSFORMATION OF CARBONACEOUS

Double refractory gold ores (DRGO) contain metal sulfides that encapsulate gold and prevent its ... gold adsorption by the carbonaceous surrogates and carbon-containing gold concentrates. ... pyrite and arsenopyrite, and sulfide-containing gold concentrate, biotransformation led to high concentrations of iron, sulfur and arsenic in incubation ...

BACTERIAL LEACHING AS A PRE-TREATMENT STEP FOR GOLD ...

FOR GOLD RECOVERY FROM REFRACTORY ORES ... sulphide concentrates is shown in Figure 1. The key components of the process involve concentration of a ground ore, usually by flotation, followed by oxidation of the gold-bearing sulphides to the required extent in a multi-stage process. Oxidized

Chloride-hypochlorite oxidation and leaching of refractory ...

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 ...

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

This shows that the ore is a sulfide refractory gold ore (Saba et al., 2011). Chloride–hypochlorite oxidation and leaching of refractory sulfide gold concentrate 65 Fig. 3. Particles size analysis of gold concentrate Fig. 4. XRD analysis of gold concentrate obtained by flotation Table 1. Major elements composition of the ore and floated ...

Mineralogy and Pretreatment of a Refractory Gold Deposit ...

The grade and recovery of gold in the flotation concentrates were 49.44 g/t and 33.36%, respectively. The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of

Biological pretreatment of carbonaceous matter in double ...

Sep 01, 2020 · Double refractory gold ores (DRGO) are becoming increasingly attractive as a source of gold, owing to the depletion of easier to process ores. The double refractory behavior is a consequence of the preg-robbing of dissolved Au species (Au(CN) 2 − ) by carbonaceous matter and encapsulation of the gold in sulfide minerals such as pyrite and ...

Gold extraction - Wikipedia

Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of ...

Specific Refractory Gold Flotation and Bio-Oxidation ...

refractory, sulphidic ores. 2. Ore Mineralogy and Physico-Chemistry Ore mineralogy coupled with physico-chemical characteristics play a critical role in their response to mineral processing and extraction techniques. The comprehensive mineralogy and physico-chemistry of the two different gold ores alongside their flotation

US4654079A - Process for improving the extraction yield of ...

A process for the extraction of silver and gold from refractory ore is disclosed. The process includes first grinding the refractory ore. This ground refractory ore is subsequently treated with an alkali solution of a stoichiometric excess amount of sulphide in relation to the amount of gold and silver contained in the refractory ore, to thus form a pulp containing a gold and silver sulfide.

Biorecovery of nanogold and nanogold compounds from gold ...

Apr 20, 2021 · In refractory ores and concentrates, gold appears in a form of microparticles surrounded by a layer of sulfide complexes which limits the access to cyanide (Canales et al. 2002). By the purpose of efficient cyanidation, the sulfide matrix should be removed by thermal or chemical oxidation pretreatments for easier access of solution of cyanide ...

Refractory gold ores in Archaean greenstones,Western ...

Mesothermal gold ores in the Archaean Yilgarn Craton of Western Australia are dominated by a pyrite ± arsenopyrite ± pyrrhotite sulphide assemblage. Many of these ores are refractory to varying degrees and require treatment by roasting, bacterial oxidation or finer milling. The most common sulphide ore types can be sub-divided broadly into ...

Invisible gold | SpringerLink

Mar 05, 2017 · The problem of invisible gold has acquired global importance because, in many countries, large deposits of disseminated sulfide ores with refractory properties are the main potential source of gold production. The involvement of new gold sulfide deposits with refractory “invisible” gold in operation, in the authors' opinion, will increase and stabilize the level of gold mining in Russia ...