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  • How Is Chromite Used? | Reference

    How Is Chromite Used? Chromite, a mineral ore that is mined from crystallized magma, is used in the production of steel as a pigment and as a catalyst in many chemical reactions It is also an important component of the leather tanning process

  • Chalcopyrite, Pentlandite, and Pyrrhotite - USGSgov

    Due to a lapse in appropriations, the majority of USGS websites may not be up to date and may not reflect current conditions Websites displaying real-time data, such as Earthquake and Water and information needed for public health and safety will be updated with limited support

  • Pyrrhotite Foundations - LAW OFFICES OF STEVEN J O'NEILL

    "Crumbling Foundation" and "crumbling basement" are terms commonly used to describe concrete foundations that have begun to deteriorate because of the presence of pyrrhotite aggregate

  • Pyrrhotite in Concrete - Attack A Crack

    Pyrrhotite WARNING in CT The Connecticut Department of Housing recently posted a bulletin, stating there are upwards of 35,000 Homes and Businesses in the North, East, and Central parts of Connecticut that are facing a potentially devastating issue due to the presence of a naturally occurring Iron Sulfide(Pyrrhotite) originating from a quarry .

  • FERRIC SULPHATE LEACHING OF PYRRHOTITE TAILINGS

    pyrrhotite and pentlandite, the two principal nickel-bearing minerals in the tailings, are leached by ferric sulphate which is regenerated by microbial assistance Ferric ion is a strong oxidizing agent that plays an important role in oxidation of sulphide or

  • Evolution of pyrrhotite oxidation in aggregates for concrete

    Rocks containing pyrrhotite bands are sometimes used to produce concrete These rocks oxidize These rocks oxidize and produce long-term expansive reactions that damage concrete structures, leading to important economic

  • The separation of pentlandite from chalcopyrite ,

    The separation of pentlandite from chalcopyrite, pyrrhotite and gangue in nickel projects throughout the world V Lawson, G Hill, L Kormos, G Marrs

  • Pyrrhotite Depressant in Polymetallic Flotation - Froth ,

    The number one depressant is reagent starvation In polymetallic ore pyrrhotite does not compete very well for collectors, and the use of starvation dosages is far more effective than trying to depress pyrrhotite once it has been activated

  • (PDF) Replacement of pyrrhotite by pyrite and marcasite ,

    The transformation of pyrrhotite to Fe disulfide (pyrite and/or marcasite) under hydrothermal conditions was studied experimentally by probing the effects of temperature (up to 220 °C, vapor .

  • How to use pyrrhotite in a sentence - wordhippo

    Here are 32 fantastic examples of sentences and phrases with the word "pyrrhotite"

  • Wisconsin Geological & Natural History Survey » Pyrrhotite

    Pyrrhotite with pen for scale From the mineral collection of Brigham Young University Department of Geology, Provo, Utah, Mineral Specimens 867

  • Chalcopyrite-mineral properties and uses - Geology

    Auriferous Chalcopyrite: A specimen of chalcopyrite with pyrrhotite from the Rouyn District, Quebec, Canada Some chalcopyrite contains enough gold or silver that it can be an ore of those metals without considering the copper content

  • Pyrrhotite in Concrete - Attack A Crack

    Pyrrhotite WARNING in CT The Connecticut Department of Housing recently posted a bulletin, stating there are upwards of 35,000 Homes and Businesses in the North, East, and Central parts of Connecticut that are facing a potentially devastating issue due to the presence of a naturally occurring Iron Sulfide(Pyrrhotite) originating from a quarry .

  • Pyrrhotite | Encyclopedia

    *pyrrhotite* Mineral, FeS; sp gr , Citation styl Encyclopedia gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA)

  • Pyrrhotite Mineral Data

    Pyrrhotite Comments: Lustrous sharp crystals of pyrrhotite to 35 cm in size with minor sphalerite and chalcopyrite Location: Nikolaevskiy mine, Dal'negors, Primorskiy Kray, Russia

  • Pyrrhotite - an overview | ScienceDirect Topics

    Pyrrhotite dissolution can proceed through oxidative or nonoxidative reactions Oxidative dissolution can be at least 10 3 times slower than nonoxidative reactions (Thomas et al, 1998)

  • Troilite - Wikipedia

    Troilite is a rare iron sulfide mineral with the simple formula of FeS It is the iron rich endmember of the pyrrhotite group Pyrrhotite has the formula Fe (1-x) S (x = 0 to 02) which is iron deficient

  • New collaboration to better protect Canadians from the ,

    Quotes "This collaboration between the National Research Council of Canada and Université Laval will ensure the safety of Canadians and minimize the future economic impact of pyrrhotite in concrete in Trois-Riviéres, in Quebec and across the country"

  • Pyrrhotite - Assignment Point

    Pyrrhotite Definition Pyrrhotite is a common bronze-coloured magnetic mineral consisting of ferrous sulphide in hexagonal crystalline form It is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic

  • Pyrrhotite: useful references - CAA-Québec

    Pyrrhotite is a mineral that is present naturally in the ground Because of its particular properties (it oxidizes upon contact with air or dampness, and it releases sulphuric acid that attacks cement paste), pyrrhotite should never, for obvious reasons, be present in the aggregate used in making concrete

  • Pyrite Mineral | Uses and Properties

    Pyrite used to be an important ore for the production of sulfur and sulfuric ac Today most sulfur is obtained as a byproduct of oil and gas processing Some sulfur continues to be produced from pyrite as a byproduct of gold production

  • How do pyrite and pyrrhotite damage building foundations ,

    Pyrite and pyrrhotite are minerals known as iron sulfid When iron sulfides are exposed to water and oxygen, a series of chemical reactions breaks down the iron ,

  • Pyrrhotite: The mineral pyrrhotite information and pictures

    Pyrrhotite is commonly pseudomorphed by Pyrite, with complete replacement of the Pyrhottite by sparkling Pyrite crystals Pyrrhotite is named from the Greek word pyrrhos, which means "color of fire"

  • Pyrrhotite | Define Pyrrhotite at Dictionary

    Pyrrhotite definition, a common mineral, iron sulfide, approximately FeS but variable because of a partial absence of ferrous ions, occurring in massive and in crystal forms with a bronze color and metallic luster; magnetic pyrites: generally slightly magnetic See more

  • Pyrrhotite: Mineral information, data and localiti

    Pyrrhotite is found with pentlandite in basic igneous rocks, veins, and metamorphic rocks It is also often found with pyrite, marcasite, and magnetite