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An XPS and XANES Study on the Bioleaching of Arsenopyrite ...
In the present study, we investigated the bioleaching of arsenopyrite with or without pyrite by moderate thermophiles. In both chemical leaching and bioleaching, the addition of pyrite decreased the leaching rate of arsenopyrite. The arsenic speciation and minerology changes in the residues were analysed by Xray Absorption Near Edge Structure (XANES) Spectroscopy, Xray Photoelectron ...
Get PriceBiological LeachingPressure Oxidation for Auriferous ...
A process has been evaluated, on a continuous pilot plant scale, to treat refractory gold arsenopyrite/pyrite . concentrates. The process consisted of biological leaching to partially oxidise sulphides, followed by pressure leaching for complete sulphide oxidation and arsenic precipitation, followed by liquor neutralisation and
Get PriceArsenopyrite an overview | ScienceDirect Topics
Arsenopyrite was observed to be more reactive than pyrite, chalcopyrite, galena, and sphalerite. Oxidation of arsenopyrite led to the formation of scorodite on the surface. The activation energies for arsenopyrite oxidation varied from 18 kJ mol –1 at 0–25 °C, …
Get PriceGold in Arsenopyrite Gold Refining
Apr 04, 2009· It is arsenopyrite, It contains arsenic, Iron, Gold, and cobalt to my understanding. The place was accualy a cobalt mine in the 1700's for the textile industry, the gold was only known since the 1960's. Since it is a sulfide ore, should I bake it to expose the gold and to break up the pyrite and arsenic? or should I grind it and hit the chems?
Get PriceEstablishing thE ProcEss MinEralogy of gold orEs
In gold ores, pyrite and arsenopyrite often occur in three morphological types: coarse, porous (blastic) and finegrained. Framboidal and microcrystalline pyrite are also observed in some gold deposits. Generally, the order of concentration of gold in pyrite and arsenopyrite is: finegrained>porous>coarsegrained (Figures 8 9). In some
Get PriceBioleaching: Introduction, Methods, Application, Copper ...
Microbial leaching of refractory precious metal ores to enhance recovery of gold and silver is one of the most promising applications. Gold is obtained through bioleaching of arsenopyrite/pyrite ore and its cyanidation process. Silver is more readily solubilized than gold during microbial leaching of iron sulphide.
Get PriceThe ferric leaching kinetics of arsenopyrite
reported. However, recent research has shown that the ferric leaching kinetics of pyrite wx wx6,7 and arsenopyrite 11 may be dependent on the ferric–ferrous iron ratio , redox potential , and not a function of the total or ferric iron concentrations.. Boon 6 suggested that the ferric leaching of pyrite could be described by means ofwx
Get PriceAn XPS and XANES Study on the Bioleaching of Arsenopyrite ...
In the present study, we investigated the bioleaching of arsenopyrite with or without pyrite by moderate thermophiles. In both chemical leaching and bioleaching, the addition of pyrite decreased the leaching rate of arsenopyrite. The arsenic speciation and minerology changes in the residues were analysed by Xray Absorption Near Edge Structure (XANES) Spectroscopy, …
Get PriceCorrosion Behavior of a Pyrite and Arsenopyrite Galvanic ...
pyrite and arsenopyrite in the leaching process has been seldom discussed. The novelty of this paper is the study of the corrosion behavior of pyrite, arsenopyrite, and the galvanic pair in the presence of. Minerals 2019, 9, 169 3 of 14
Get Price[PDF] OXIDATION OF REFRACTORY GOLD CONCENTRATES AND ...
Jan 01, 2004· The alkaline oxidation of pyrite primarily yields thiosulfate and sulfite. A kinetic investigation of the oxidation of arsenopyrite with air or oxygen has shown that the initial rate of arsenopyrite oxidation is proportional to the concentration of dissolved oxygen.
Get PriceStudies on the bioleaching of refractory concentrates
The chemical ferric leaching rate of pyrite and arsenopyrite decrease with a decrease in the solution redox and may be described using a modified ButlerVolmer equation. The bacterial ferrousiron oxidation kinetics of L. ferrooxidans also depend on the redox potential, and can be described using a MichaelisMenten
Get PricePyrite | Earth Sciences Museum | University of Waterloo
Back to Rocks and Minerals Articles Kathy Feick Pyrite group of minerals Pyrite Chalcopyrite Marcasite Arsenopyrite Chromate Copper Arsenate Pyrite FeS2 (Isoclinic) Pyrite’s name comes from the Greek, pyrites lithos, “the stone which strikes fire.” The crystals form in the Isometric System; cubes, octahedrons, pyritohedrons and combinations of these and other forms.
Get PriceAcid‐bacterial and ferric sulfate leaching of pyrite ...
Pyrite leaching in ferric sulfate solutions was observed to be different when compared to acid‐bacterial leaching. ... The biological and chemical leaching of an auriferous pyrite/arsenopyrite flotation concentrate: A microscopic examination, Geomicrobiology Journal, /01490458809377817, 6, ...
Get PricePyritepromoted dissolution of arsenopyrite in the ...
Jul 01, 2020· In our previous study , it was found that increasing the mass ratio of pyrite to arsenopyrite enhanced the galvanic effect, but the improvement of arsenopyrite leaching was not only because of the galvanic effect but also due to the control of pH/redox potential. In this study, the galvanic coupling is the major cause of the catalyzed oxidation ...
Get PriceRecovery of Gold from Arsenopyrite Concentrates by ...
Pyrite Silver Activated carbon ... The Bureau of Mines investigated a cyanidationcarbon adsorption technique for extracting gold from arsenopyrite concentrates. Agitation leach experiments were conducted on 85pctminus35mesh gravity concentrates containing oz gold and oz silver per ton. Results obtained in leaching the concentrates ...
Get PriceCharacterization of refractory behaviour of complex gold ...
pyrite, % arsenopyrite and a bulk flotation concentrates. Based on the results of diagnostic leaching tests, CELEP et al[23] concluded that the refractoriness of a refractory gold ore was associated with the ... CuZn sulphides, labile pyrite Cyanide leaching NaCN …
Get PriceArsenopyrite and pyrite bioleaching: evidence from XPS ...
Aug 17, 2011· The flotation concentrate was a mixture of pyrite (FeS 2) and arsenopyrite (FeAsS); after bioleaching, 95% of the initial content of pyrite and 85% of arsenopyrite were dissolved. The chemical state of the main elements (Fe, As and S) at the surface of the bioreactor feed particles and of the residue after bioleaching was investigated by Xray ...
Get PriceRcovery of gold in pyritic ores Mine
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).
Get PriceBioleaching LinkedIn SlideShare
Apr 30, 2015· Microbial leaching of refractory process metal ores to enhance gold and silver recovery is one of the promising applications Gold is obtained through bioleaching of arsenopyrite/pyrite Silver is also obtained by bioleaching of arsenopyrite but it is more readily solubilized than gold during microbial leaching of iron sulphide. 19.
Get PriceGold Pyrite, Pyrrhotite and Arsenopyrite Recovery
One of the more common classes of ores containing gold is when gold is associated with pyrite, pyrrhotite, and arsenopyrite. This is the area of gold recovery that has probably received the most research and plant optimization support especially in light of the long history of South African industrial practice. From a reagent viewpoint, charged water soluble collectors such as xanthates ...
Get Pricearsenopyrite pyrite leaching
Arsenopyrite an overview ScienceDirect Topics. The flotation concentrate was finely ground before cyanide leaching Separation of arsenopyrite FeAsS and pyrite Fe 2 S from stibnite Sb 2 S 3 may be achieved in strongly alkaline conditions with the addition of copper sulfate to float arsenopyrite and pyrite Zaman 1985a After these have been removed a lead salt is introduced to
Get PriceArsenopyrite and pyrite bioleaching: Evidence from XPS ...
The flotation concentrate was a mixture of pyrite (FeS(2)) and arsenopyrite (FeAsS); after bioleaching, 95% of the initial content of pyrite and 85% of arsenopyrite were dissolved.
Get PriceCyanidation of a pyrrhotitebearing gold ore 911 ...
The paper suggested that sulphide minerals could be divided into three groups depending upon their effect on gold leaching: a group that has a negative effect (stibnite, chalcocite and pyrrhotite); a group that neither seriously reduces nor greatly enhances gold leaching (pyrite, chalcopyrite, arsenopyrite and sphalerite); and, a group that ...
Get PriceOptimization of bioleaching and oxidation of goldbearing ...
Sep 25, 2014· Biooxidation of refractory goldbearing pyritearsenopyrite flotation concentrate was optimized and the abundance of predominant groups in the community of thermophilic acidophilic chemolithotrophic microorganisms at various stages of bioleaching was determined. The optimal parameters for growth and leaching/oxidation of the mineral components of the concentrate were pH …
Get PriceCA2880943A1 Method for leaching gold from gold ore ...
The present invention improves the leaching speed of gold while also inhibiting the generation of sulfur dioxide in a method for leaching gold from gold ore containing pyrite without using highly poisonous chemicals such as cyanogen, thiourea, thiosulfuric acid, and halogen gas. A method for leaching gold involving: pretreatment steps which include a step (1) for preparing a gold ore ...
Get PriceAlkaline Oxidative Leaching of GoldBearing Arsenopyrite Ores
arsenopyrite dissolution were determined using cyclic voltammetry and chronocoulometry. Initial arsenopyrite dissolution occurred at V versus standard hydrogen electrode (SHE) in a sodium hydroxide (Na0H) solution. Leaching of a highgrade arsenopyritic ore containing, in percent, As,
Get PriceKinetic study of sulfide leaching by galvanic interaction ...
Kinetic study of sulfide leaching by galvanic interaction between chalcopyrite, pyrite, and sphalerite in the presence of T. ferrooxidans (30°C) and a thermophilic microorganism (55°C) A. P. Mehta Department of Metallurgical and Materials Engineering, New Mexico Institute of Mining and Technology, Socorro
Get PriceLeaching of the arsenopyrite/pyrite flotation concentrates ...
arsenopyrite component. The cyanide leach of the reductive leach residues showed very little improvement in gold recovery. The reductive leach process for arsenopyrite/pyrite has considerable limitations in terms of both desulphurization and precious metals liberation. Keywords: Pyrite, arsenopyrite reductive leaching, hydrogen sulphide ...
Get PriceWeathering Products of Arsenopyrite and Pyrite from El ...
constitute the ore, and arsenopyrite, pyrite, gold and scorodite (Burkhardt et al. 1987). secondary minerals, and quartz, The aim of this work is to study the mine wastes from the abandoned tungsten El Bollo exploitation in order to identify and characterise the secondary products generated from arsenopyrite and pyrite
Get PricePotential Role of Thiobacillus caldus in Arsenopyrite ...
We investigated the potential role of the three strains of Thiobacillus caldus (KU, BC13, and CSH12) in arsenopyrite leaching in combination with a moderately thermophilic iron oxidizer, Sulfobacillus thermosulfidooxidans . Pure cultures of T. caldus and S. thermosulfidooxidans were used as well as defined mixed cultures. By measuring released iron, tetrathionate, and sulfur concentrations ...
Get PriceAgitated Tank Bioleaching MINTEK | MINTEK
The most common cause of refractoriness is the association of the gold with sulfide minerals such as arsenopyrite and pyrite, by physical lockup in the sulfide grains or by substitution in the sulfide lattice. This results in poor recoveries (as low as 10 to 20 per cent) by direct cyanide leaching.
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