• Pyrite - Wikipedia

    Pyrite oxidation has been studied extensively, in the past, because of its importance in sulfide mineral separations by flotation, in the generation of acid in mine waters and in leaching of pyrite The oxidation of pyrite also plays key role in supergene alteration of ore deposits, the formation of acid sulfate soils, etc Pyrite oxidation is generally recognized as a complicated process .

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  • Pyrite: The mineral pyrite information and pictures

    Pyrite was once used as a source of sulfur, but is now only a minor ore for both sulfur and iron Pyrite from some localities is auriferous, and therefore is used as an ore of gold in gold-bearing localitiPyrite was polished by the Native Americans in the early times and used as mirrors Today, it is used as an ornamental stone, as well as a very popular stone for amateur collectors

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  • pyrite cleaning « McDougall Minerals

    Although what we tend to see in the photographs, museums and mineral shows are the perfect sharp cubes with mirror lustre, in fact the mode of occurrence and condition of Victoria Mine pyrites varies considerably Some of the pyrite crystals can be quite distorted, and some show varying degrees of oxidation Pyrite crystals at Level 2

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  • Mineralogical and geochemical studies on pyrite and ,

    rich in sulphide minerals particularly pyrite and chalcopyrite Oxidation of these minerals produces the well-known problem of acid mine drainage In this research, a depth sampling was conducted over the tailings materials Two vertical trenches (A and B) were excavated in tailings from the surface to ,

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  • Pyrite Depression By Reduction Of Solution Oxidation Potential

    ----- PYRITE DEPRESSION BY REDUCTION OF SOLUTION OXIDATION POTENTIAL Department of Mineral Engineering University of Utah Salt Lake City, Utah 84112 for ENVIRONMENTAL PROTECTION AGENCY WATER QUALITY OFFICE Grant Number 12010 DIM December, 1970

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  • Experimental determination of pyrite and molybdenite ,

    iments to measure pyrite and molybdenite oxidation rates as a function of O 2 and pH Pyrite oxidation experiments were performed in duplicate under three different pH con-ditions (183, 503, and 858) Molybdenite was explored in the remaining three experiments at pH 183, 503, and 948 Pyrite oxidation experiments were performed using trace

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  • Pyrite | Earth Sciences Museum | University of Waterloo

    It is also lighter and is a brassy yellow mineral with a greenish tint at times or possibly a multi-coloured tarnish which results from oxidation Marcasite vs Pyrite Marcasite is difficult to distinguish from pyrite when there is a lack of distinctive crystal habits

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  • Minerals | Free Full-Text | Directional Oxidation of ,

    This study aimed to investigate the oxidation mechanism of pyrite crystallographic direction by cutting pyrite samples to expose their (100), (110), and (111) plan Differences in the oxidation rates of pyrite planes in acid solution were determined The morphological changes of pyrite were evaluated by scanning electron microscopy and hyperdepth-3D microscopy

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  • OXIDATION OF SULFIDE MINERALS, 4 PYRITE, ,

    oxidation of pyrite, pyrrhotite and chalcopyrite at 52°C and 68% relative humidity (RH) Previous studies on weathered pyrite by Saksela (1952), Frenzel (1957) and Nambu (1957) or on the low-temperature oxidation of pyrite by jee (1971), Sinha and Walker (1972) and Frost et al (1974) do not show a

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  • Experimental determination of pyrite and molybdenite ,

    iments to measure pyrite and molybdenite oxidation rates as a function of O 2 and pH Pyrite oxidation experiments were performed in duplicate under three different pH con-ditions (183, 503, and 858) Molybdenite was explored in the remaining three experiments at pH 183, 503, and 948 Pyrite oxidation experiments were performed using trace

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  • geochemistry - Difference between pyrite oxidation and ,

    Oxidation and dissolution are not the same processes, but they are related when discussing the breakdown of pyrite in near surface environments Dissolution is a process(*1) in which the chemical components of a solid become part of a liquid, in the liquid state

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  • Sulphides or Pyrites oxidizing so fast it is actually burning

    May 19, 2015· Sulphides or Pyrites oxidizing so fast it is actually burning Dan Hurd , which probably help out with the oxidation process When I arrived, I ,

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  • Pyrite oxidation: a state-of-the-art assessment of the ,

    The oxidation of pyrite to release ferrous iron and sulfate ions to solution involves the transfer of seven electrons from each sulfur atom in the mineral to an aqueous oxidant Because only one or, at most, two electrons can be transferred at a time, the overall oxidation process is quite complex

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  • Pyrite Oxidation Mechanism by Oxygen in Aqueous Medium

    Pearson19 showed that, in the pyrite oxidation process, a minimum of 7 electron-transfer steps are necessary to describe completely the oxidation on the pyrite surface Furthermore, it is well-known that different bacteria can catalyze the pyrite oxidation at a much rapid rate, making its mechanism even more complex20

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  • Pyrite - McGill School Of Computer Science

    Formal oxidation states for pyrite, marcasite, and arsenopyrite From the perspective of classical inorganic chemistry, which assigns formal oxidation states to each atom, pyrite is probably best described as Fe 2+ S 2 2- This formalism recognizes that the sulfur atoms in pyrite occur in pairs with clear S-S bonds

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  • Sulphides or Pyrites oxidizing so fast it is actually burning

    May 19, 2015· Sulphides or Pyrites oxidizing so fast it is actually burning Dan Hurd , which probably help out with the oxidation process When I arrived, I found a rock of Pyrrhotite lay on on the surface .

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  • Alkaline Oxidation of Pyrite in Gold Recovery - AusIMM

    The Porgera mineral deposit in Papua-New Guinea contains gold as finely divided, probably submicroscopic (1 um) particles dispersed in a pyrite sulphide matrix Only 25-30% of the gold in pyrite can be extracted by direct cyanide leaching and fine grinding the pyrite does not increase gold extraction significantly This work is concerned with the application.

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  • Pyrite Mineral | Uses and Properties

    Pyrite should not be present in the base material, subsoil or bedrock under roads, parking lots, or buildings Oxidation of pyrite can result in damage to pavement, foundations, and floors In parts of the country where pyrite is commonly found, construction sites ,

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  • Pyrite-pyrrhotine redox reactions in nature - RRUFF

    Pyrite-pyrrhotine redox reactions in nature A J HALL Department of Applied Geology, University of Strathclyde, Glasgow G1 1XJ ABSTRACT The origin in rocks of the common iron sulphides, pyrrhotine, Fe 1 xS and pyrite, FeS2 and their behaviour during geochemical processes is best con-

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  • Goethite - Wikipedia

    As iron-bearing minerals are brought to the zone of oxidation within the soil, the iron turns from iron(II) to iron(III), while the original shape of the parent mineral is retained Examples of common goethite pseudomorphs are: goethites after pyrite, goethite, siderite, and marcasite, though any iron(II)-bearing mineral could become a goethite .

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  • Experimental Study of Pyrite Oxidation at 100 °C ,

    Pyrite is a ubiquitous sulfide mineral on Earth It is present in many geological contexts, like hydrothermal deposits [] or sedimentary rocks [2,3]The association of pyrite with ore-minerals like sphalerite, galena or chalcopyrite makes the study of this mineral, and in particular its alteration, primordial from economic and environmental points of view

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  • Goethite - Wikipedia

    As iron-bearing minerals are brought to the zone of oxidation within the soil, the iron turns from iron(II) to iron(III), while the original shape of the parent mineral is retained Examples of common goethite pseudomorphs are: goethites after pyrite, goethite, siderite, and marcasite, though any iron(II)-bearing mineral could become a goethite .

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  • Pyrite | Earth Sciences Museum | University of Waterloo

    It is also lighter and is a brassy yellow mineral with a greenish tint at times or possibly a multi-coloured tarnish which results from oxidation Marcasite vs Pyrite Marcasite is difficult to distinguish from pyrite when there is a lack of distinctive crystal habits

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  • amrclearinghouseorg :::AMD Basics - PYRITE REACTIONS:::

    The mineral pyrite , of a bacteria known as Thiobacillus ferroxidans which likes acidic conditions and can greatly enhance the rate of oxidation of iron and sulfur containing compounds See Colorado School of Mines page on Microbial Influences on AMD

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  • Mechanism of Bacterial Pyrite Oxidation - jbasmorg

    The rate of oxidation of a number of sulfide minerals is markedly accelerated by the acido-philic, chemoautotrophic, iron-oxidizing bac- , of bacterial pyrite oxidation while altering the rate of oxygen uptake from linear to nonlinear (Fig 1 and2, curves 1 and2; Fig 3, curves 1 and 4)

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