Gold 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 ...
Pyrite - Wikipedia
Pyrites metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fools gold.The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.. The name pyrite is derived from the Greek πυρίτης λίθος (pyritēs lithos), "stone or mineral which strikes fire", in turn from ...
The mechanisms of pyrite oxidation and leaching: …
Pyrite leaching has been studied under conditions of varying pH, Eh, oxidant (Fe 3+ and O 2), stirring speeds, stone size and temperatures , , , , , , , , . These experiments have generally shown that the addition of oxidants, Fe 3+ and O 2, significantly increases the rate of pyrite dissolution.
The impacts of pyrite/pyrrhotite on aqueous …
In this study, the arsenic species in solution during the arsenopyrite pressure leaching with the co-existence of pyrite or pyrrhotite were investigated. In situ XAS has confirmed that the arsenic in solution was present mostly as As(V) at low temperatures and As(III) at elevated temperatures, and the As(III) can be re-oxidised to As(V) during cooling process.
Leaching of the arsenopyrite/pyrite flotation concentrates ...
LEACHING OF THE ARSENOPYRITE/PYRITE FLOTATION CONCENTRATES 1 MAHLANGU, T., GUDYANGA, F.P., and SIMBI, D.J. Leaching of the arsenopyrite/pyrite flotation concentrates using metallic iron in a hydrochloric acid medium. Hydrometallurgy Conference 2009,The Southern African Institute of Mining and Metallurgy, 2009.
Biological Leaching-Pressure Oxidation for Auriferous ...
LEACHING-PRESSURE OXIDATION PROCESS FOR AURIFEROUS ARSENOPYRITE/PYRITE FEEDSTOCKS. I. DYMOV AND C.J. FERRON –– SGS; W. PHILLIPS –– KINROSS GOLD CORP. ABSTRACT . A process has been evaluated, on a continuous pilot plant scale, to treat refractory gold arsenopyrite/pyrite . concentrates.
Corrosion Behavior of a Pyrite and Arsenopyrite Galvanic ...
pyrite and arsenopyrite in the leaching process has been seldom discussed. The novelty of this stone 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
Pyrite Processing - vollendam.nl
Mineral processing plants dealing with pyrite (for both leaching and flotation) can benefit positively by controlling electrochemically driven oxidation processes within the circuit. Further studies, resulting in the provision of information on product/intermediate speciation and spatial distribution, are required to further validate the existence of electrochemical processes as a dominant
bacterial heap leaching of refractory gold sulphide …
Bacterial heap leaching of refractory gold/sulphide ores . Keywords.Gold occurs as free gold 40% and gold locked in pyrite and arsenopyrite 60%. Gold recovery in alkaline cyanide heap leaching after bacterial leaching was 74 % compared with 24 % without bacterial heap leaching, but the acid consumption to achieve this recovery was very high at
An XPS and XANES Study on the Bioleaching of …
In the present study, we investigated the bioleaching of arsenopyrite with or without pyrite by moderate thermophiles. In both stone 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 X-ray Absorption Near Edge Structure (XANES) Spectroscopy, X-ray Photoelectron ...
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
The 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 i.e., 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
drug flotation ore arsenopyrite gold
Leaching of the arsenopyrite/pyrite flotation concentrates . LEACHING OF THE ARSENOPYRITE/PYRITE FLOTATION CONCENTRATES 1 MAHLANGU T GUDYANGA FP and SIMBI DJ Leaching of the arsenopyrite/pyrite flotation concentrates using metallic iron in a hydrochloric acid medium Hydrometallurgy Conference 2009 The Southern African Institute of Mining and ...
arsenopyrite ore pictures - redhatsocietyeindhoven.nl
Gold Ore Roasting Techniques Mineral Processing 2020229Metallurgical ContentRecover Gold by Roasting Pyrite OreRoasting of flotation concentratesRoasting Arsenopyrite Ore for GoldRoasting and leaching a sulphide concentrateRoasting and Processing Sulphotelluride ore to recover goldFluoSolids Roasting SystemRoasting with a FluoSolids reactorWhy use Salts in the roasting processROASTING Pyrite ...
Effect of pyrite on bioleaching of arsenopyrite
When the mass ratio of pyrite to arsenopyrite is 10:2 and the particles size of pyrite is less than 74 μm, the highest leaching rate of arsenic is 97.7%, which is about 43.18 % higher than that ...
Arsenopyrite and pyrite bioleaching: Evidence from …
Arsenopyrite and pyrite bioleaching: Evidence from XPS, XRD and ICP techniques Article in Analytical and Bioanalytical Chemistry 401(7):2237-48 · August 2011 with 59 Reads How we measure reads
OXIDATION OF REFRACTORY GOLD CONCENTRATES AND …
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. A reaction mechanism for the oxidation of arsenopyrite has been proposed, which involves
An XPS and XANES Study on the Bioleaching of …
In both stone 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 X-ray Absorption Near Edge Structure (XANES) Spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and powder X-ray Diffraction (XRD).
PRESSURE OXIDATION OF PYRITE-ARSENOPYRITE REFRACTORY …
leaching the host mineral must be broken by mechanical or stone means. The aim of this study was to study the effect of temperature, oxygen partial pressure and slurry density on pressure oxidation of pyrite-arsenopyrite gold concentrate. Batch oxidation tests in …