leaching gold from pyrite

Kinetics of advanced oxidative leaching of pyrite in a ...

2020-3-11 · leaching of gold from gold-bearing pyrite ores using the advanced oxidative leaching system. Keywords gold-bearing pyrite, high-grade oxidation, leaching dynamics, activation energy. Introduction Pyrite is one of the most common sulphide ores, and is an important carrier of gold, silver, and platinum

Comparative Study of Gold Extraction from Refractory ...

2020-5-7 · Characterization indicated that pyrite was the main mineral. Simultaneous pressure oxidation and leaching experiments were conducted at a temperature range of 40–80 °C, oxygen pressure of 87.5–200 psi, and cyanide concentration of 0.8–1.2 wt% in a 2-L Parr pressure reactor.

Bacteria Leaching of Gold Encapsulated in Pyrite

2018-2-19 · The extraction recovery of gold and silver using bioleaching ahead of cyanidation is a function of pyrite (and other sulfides) bio-oxidation. The higher the degree of oxidation of pyrite, the higher is the extraction recovery of gold and silver.

Gold recovery from refractory gold concentrates by ...

2019-3-1 · is probably from pyrite. Combining with the gold phase analysis results shown in Table 2, some amount of gold excited in the form of exposed gold, the part of gold could be leaching directly. A large proportion of gold was encapsulated in sulfide which was hardy leaching. The main elements of the gangue mineral were Ca, Mg and Si.

The biological leaching of an auriferous pyrite ore ...

The oxidation of an auriferous pyrite ore sample was evaluated in biological leaching experiments for subsequent gold recovery via cyanidation. In batch cultures, organisms derived from the mine site oxidized pyrite and ferrous iron at pH values as low as pH 0.6. The recovery of gold was variable in shake flask experiments. In stirred tank bioreactor leaching, gold recovery was proportional to ...

Extracting gold from pyrite roster cinder by ultra-fine ...

2003-3-1 · The ultra-fine-grinding and resin-in-pulp with pH value of 10 are used to extract gold from pyrite roster cinder. During leaching process, aluminium oxide ball is used as stirring medium, hydrogen peroxide as leaching agent and sodium hexametaphosphate as grinding agent. With AM-2σ resin as absorber and sulfocarbamide as eluent, gold is recovered from cyanide pulp of pyrite roster cinder by …

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

2021-4-27 · Recovery of gold from refractory gold ores: Effect of pyrite on the stability of the thiourea leaching system Hong Qin1), Xue-yi Guo1,2), Qing-hua Tian1,2), and Lei Zhang1) 1) School of Metallurgy and Environment, Central South University, Changsha 410083, China

Recovery of gold from sulfide refractory gold ore ...

2021-4-1 · Recovery gold from the leaching residue by enhanced chlorination roasting. In a typical roasting procedure, a certain amount of calcium chloride, leaching residue and pyrite were thoroughly blended with a certain mass ratio. Subsequently, put 20.0 g pre-prepared samples into corundum porcelain boat and pushed to the tube furnace.

Recovery of gold from sulfide refractory gold ore ...

Ammoniacal thiosulphate leaching of gold in the presence ...

Comparative Leaching Tests of Gold from Unroasted and ...

2021-3-3 · 400oC but for the roasted pyrite at 700oC the consumption of lime is reduced from 110 kg·t-1to 10 kg·t-1, cyanide is reduced from 2.8 kg·t-1 to 1.76 kg·t-1, and yields of leaching increase from 50 % for unroasted pyrite at 81 % for roasted pyrite. Keywords: leaching, cyanide, gold recovery, microwave 1. …

The mechanisms of pyrite oxidation and leaching: A ...

2010-9-1 · Occasionally pyrite may also carry dispersions of valuable metals such as gold and is sometimes mined for this, in addition pyrite is commonly used for production of sulfuric acid . Pyrite oxidation is economically important in mineral flotation and leaching, two industrial methodologies used to separate pyrite from other minerals of value.

CA2898420A1

Provided is a method for leaching gold from gold ore containing pyrite. Said method for leaching gold includes a pretreatment step that includes a step (1) in which gold ore containing pyrite is prepared, and a step (2) in which the gold ore is heated to 450°C or higher, and the pyrite in the gold ore is thermally decomposed into iron(II) sulfide and elemental sulfur.

Ammoniacal thiosulphate leaching of gold in the …

2006-8-1 · Special emphasis was placed on gold leaching in association with pyrite dissolution, thiosulphate decomposition and gold leaching passivation. The presence of pyrite retarded gold dissolution and this detrimental effect became more pronounced at higher pyrite contents. Pyrite catalysed the decomposition of thiosulphate to trithionate.

AU2013204508A1

In a process for leaching gold from gold ore containing pyrite, the speed of leaching gold is increased without use of toxic reagents such as cyanide, thiourea, thiosulfate and halogen gas, while suppressing generation of sulfur dioxide. The process comprises a pretreatment including step 1) of preparing gold ore containing pyrite and step 2) of heating the gold ore under a non-oxidative ...

A method of extracting precious metals from the …

Known to extract silver and gold from the pyrite Ogarkov sour thiosulfate sulfate solution, followed by cementation of precious metals zinc dust: t 70 about WITH, SO 3 2-10-30 g/DM 3 pH of 1.5-2.0. The method is under study, due to the decomposition of the leaching agent is practically difficult to realize on a large scale, (M. A. Beliavsky ...

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

2020-5-28 · The effect of pyrite on gold recovery in thiourea leaching systems was then confirmed via a series of experiments. The decomposition efficiency of thiourea decreased by 40% and the recovery...

EFFICIENT RECOVERY OF COBALT FROM PYRITE -UPDATE …

2020-7-18 · Minerals processing options for pyrite ores have generally been limited to roasting, pressure oxidation leaching, or bioleaching, as practised for example in the gold and copper industry. Cobalt Blue has developed and tested on bench pilot scalean efficient process for treatment of the cobalt - pyrite ore for the Broken Hill Cobalt Project.

Recovery of gold from sulfide refractory gold ore ...

2021-4-1 · The thiourea leaching combined with pyrite enhanced chlorination roasting was first proposed to effectively extract gold from the second stage roasting slag, and the pyrite shown a great role in promoting gold extraction during chlorination roasting.

''Fool''s Gold'': ''Real Gold'' Discovered in This Mineral …

2021-6-28 · Previously, gold extractors were able to find gold in pyrite, either as a pyrite-gold alloy or as nanoparticles, although what they have discovered is that gold can be hosted as well, in nanoscale ...

The influence of pyrite pre-oxidation on gold recovery …

2006-7-1 · Of these sulfides, pyrite is one of the most important minerals. Therefore, a knowledge of pyrite leaching behavior is very important for the development of improved technology for the treatment of refractory gold ores. The electrochemistry of pyrite and the kinetics of pyrite oxidation in different systems have been extensively studied.

Gold Leaching of Pyrite Concentrate

2017-2-15 · Gold Leaching of Pyrite Concentrate The ore consisted of quartz, in which, above the 250-ft. level, the iron-minerals were largely oxidized and some free gold was visible; below that level few traces of oxidation occurred, and pyrite constituted the principal mineralizer in the quartz, together with occasional pockets of galena and a few eccentric specks of covellite.

How to Separate Gold from Pyrite

2016-10-28 · Some authorities have contended that the metallic gold is disseminated mechanically through the mass of pyrites, but the action of potassium cyanide, in dissolving the whole of the gold out of comparatively coarsely crushed pyrites, seems to point to the correctness of the view that the interior of the crystal is not auriferous, the deposition of the gold being superficial, so that the enrichment of the pyrites …

The biological leaching of an auriferous pyrite ore

The oxidation of an auriferous pyrite ore sample was evaluated in biological leaching experiments for subsequent gold recovery via cyanidation. In batch cultures, organisms derived from the mine site oxidized pyrite and ferrous iron at pH values as low as pH 0.6. The recovery of gold was variable in shake flask experiments. In stirred tank bioreactor leaching, gold recovery was proportional to ...

''Fool''s Gold'': ''Real Gold'' Discovered in This Mineral …

2021-6-28 · A study published recently provides a comprehensive analysis to understand "fool''s gold'' further specifically the mineralogical location of the trapped gold in pyrite, which may result in more ...

Improvement of Gold Leaching from a Refractory Gold ...

2017-7-31 · The improvement of gold leaching from different size fractions was further investigated through pretreatments with alkali washing, acid pickling or sulfuric acid ... Zhang et al. [17] indicated that the optimal leaching ratio of iron from a pyrite cinder was only 45%. In view of crystal forms of Fe2O3, the dissolution rates of -Fe2O3 and -Fe2O3 ...

Pyrite from Zarshuran Carlin-type gold deposit ...

The main purpose of this study was to establish a connection between the mineralogy, leaching behavior and gold recovery of such gold bearing pyrites during alkaline pretreatment and cyanidation processes. The pyrite concentrate used in this study was obtained from the refractory Carlin-type gold deposit of …

Recovering Gold from a Gold-Bearing Pyrite by …

The ore assays 2.5g/t Au, 23.4% S and 56.6% Fe. This research enriched the gold by flotation, and recovered it by a chemical process. The obtained flotation concentrate contains 66.35%g/t gold and 37.06% S with recovery 96.14% and 96.42% respectively. A roasting process was conducted at 900-1000°C for 5.5hrs, followed by cyanide leaching of the residue.

The Extraction of Gold from Bioleached Pyrite using …

The application of novel thiourea leaching technologies to the extraction of gold from a bioleached pyrite concentrate was investigated. The interac- tion of leach variables with thiourea consumption and gold extraction was established. An economic assessment of thiourea leaching was compared with conventional cyanidation.

(PDF) Microbial leaching of a gold-bearing pyrite …

Over 90 % of the gold were leached from a pretreated concentrate sample in which the degree of pyrite oxidation was as high as 60 %, while only 18 % of the gold were leached from the unpretreated ...

Ammoniacal thiosulphate leaching of gold in the …

2006-8-1 · The addition of sulphate enhanced gold leaching by retarding the dissolution of pyrite in ammoniacal thiosulphate solutions. XPS analysis indicated the presence of iron hydroxide species at the gold surfaces in the presence of pyrite, which was likely responsible for the reduced gold dissolution. SEM analysis indicated a lesser extent of gold ...

Arsenic Pyrite Gold Extraction by Alkaline Leaching …

2017-7-22 · The gold and silver extractions were 90 and 76 pct, respectively, by cyanidation of the leach residue. When the leaching procedure was applied to a concentrate prepared from an ore containing 0.1 tr oz/st Au and 0.1 tr oz/st Ag, the gold …

(PDF) Kinetics of advanced oxidative leaching of pyrite …

Gold bearing pyrite leaching was conducted in H2SO4–Fe2(SO4)3 system at different reaction temperatures, with different ferric ion concentrations, sulfuric acid concentrations and stirring speeds.

Recovery of gold from sulfide refractory gold ore: Oxidation ...

2021-2-22 · The thiourea leaching combined with pyrite enhanced chlorination roasting was first proposed to effectively extract gold from the second stage roasting slag, and the pyrite shown a great role in promoting gold extraction during chlorination roasting.

Rcovery of gold in pyritic ores

2013-1-13 · The pyrite in which small amounts of gold occurs is of crystalline variety (primary pyrite). The characteristics of primary pyrite are a absence of porosity, an extreme brittleness, a resistance to oxidation, and the existence of gold possessing a weak susceptibility to magnetism (due to a fine coating of a iron compound).

Kinetics of advanced oxidative leaching of pyrite in a ...

2020-6-8 · leaching of gold from gold-bearing pyrite ores using the advanced oxidative leaching system. Keywords gold-bearing pyrite, high-grade oxidation, leaching dynamics, activation energy. Introduction Pyrite is one of the most common sulphide ores, and is an important carrier of gold, silver, and platinum

AU2013204508B2

In a process for leaching gold from gold ore containing pyrite, the speed of leaching gold is increased without use of toxic reagents such as cyanide, thiourea, thiosulfate and halogen gas, while suppressing generation of sulfur dioxide. The process comprises a pretreatment including step 1) of preparing gold ore containing pyrite and step 2) of heating the gold ore under a non-oxidative ...