pyrrhotite uses
  • Pyrrhotite - Wikipedia

    Pyrrhotite is an iron sulfide mineral with the formula Fe (1-x) S (x = 0 to 0.2). It is a nonstoichiometric variant of FeS, the mineral known as troilite. Pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic.

  • pyrrhotite ore dressing plant using magnet separator

    Silica sand iron separating machine, Silica sand deironing magnetic ... Magnetite, pyrrhotite, ilmenite ore, non-metallic ore deironing ... Magnetic separator can be used for wet dressing of the following ores with the sizes less than...

  • How do pyrite and pyrrhotite damage building foundations ...

    Pyrite and pyrrhotite in aggregates and concrete. Aggregates, such as sand, gravel, crushed stone, or other rocky material, are used as fill material in construction and are added to cement and water to make concrete. Aggregates come from a wide variety of sources, and sometimes the source rocks may contain pyrite or pyrrhotite.

  • Pyrrhotite | mineral |

    Pyrrhotite: Pyrrhotite, iron sulfide mineral (Fe1–xS) in the niccolite group; in it, the ratio of iron to sulfur atoms is variable but is usually slightly less than one. It commonly is found with pentlandite and other sulfides in silica-poor igneous rocks, as at Kongsberg, Nor.; Andreas-Berg, Ger.; Trentino,

  • State links pyrrhotite to crumbling concrete Companies ...

    "We believe there is now sufficient evidence to conclude that significant levels of the mineral pyrrhotite in stone aggregate used in the production of concrete is a substantial contributing ...

  • Pyrrhotite - Assignment Point

    Uses of Pyrrhotite. Pyrrhotite does not have specific applications. It is mined primarily because it is associated with pentlandite, sulfide mineral that can contain significant amounts of nickel and cobalt. It is an ore of iron. Well crystallized Pyrrhotite specimens are important collector's minerals.

  • Ottawa to spend $30M on helping Quebec homeowners who have ...

    Ottawa to spend $30M on helping Quebec homeowners who have pyrrhotite By Staff The Canadian Press Prime Minister Justin Trudeau looks at the foundation of …

  • Pyrrhotite - an overview | ScienceDirect Topics

    Pyrrhotite is a nonstoichiometric iron sulfide with different polytypes (Fe(1 − x)S, where x = 0–0.125). The reaction kinetics depend on pH, temperature and surface area, besides the polytype, with the monocline pyrrhotite being more reactive than the hexagonal one ( Salomons, 1995 ).

  • Pyrrhotite | Define Pyrrhotite at

    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 Specimen For Sale

    Pyrrhotite - A fabulous specimen for this species with hexagonal, thin platy bronze colored crystals to 2.5cm. Scattered about the specimen are several groups of discoidal Siderite and Quartz crystals. This is a well-trimmed, damage free, clean and showy specimen for you sulfide lovers from this classic locality. .

  • Cinnabar: A toxic ore of mercury, once used as a pigment

    What is Cinnabar? Cinnabar is a toxic mercury sulfide mineral with a chemical composition of HgS. It is the only important ore of mercury. It has a bright red color that has caused people to use it as a pigment and carve it into jewelry and ornaments for thousands of years in many parts of the world.


    COST is in support of HB 7175 and the testing of Pyrrhotite and feels that the .23% threshold established by Canada where as any more than that amount cannot be used for concrete mix or related products. Steve Werbner, Town of Tolland Town Manager, Capitol Region Council of Governments (CRCOG): CROG partially supports HB 7175.

  • Pyrrhotite | Article about pyrrhotite by The Free Dictionary

    Some pyrrhotite minerals display distinctive magnetic anisotropy—paramagnetism in one direction and ferromagnetism in the other, perpendicular to the former. Pyrrhotite is formed from hot solutions during a reduction in the concentration of dissociated S 2– ions. It is widely distributed in hypogenic copper-nickel ore deposits associated ...

  • Pyrrhotite in Concrete - Attack A Crack

    The pyrrhotite mineral can cause the slow deterioration of concrete foundations and structures when exposed to oxygen and water. While the presence of pyrrhotite indicates the potential for concrete deterioration, its existence alone does not necessarily cause it.

  • Pyrrhotite - definition of pyrrhotite by The Free Dictionary

    Define pyrrhotite. pyrrhotite synonyms, pyrrhotite pronunciation, pyrrhotite translation, English dictionary definition of pyrrhotite. also pyr·rho·tine n. A brownish-bronze iron sulfide mineral, FeS, characterized by weak magnetic properties and used as an iron ore and in the manufacture...

  • Chalcopyrite, Pentlandite, and Pyrrhotite -

    Chalcopyrite, Pentlandite, and Pyrrhotite 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 | Definition of Pyrrhotite by Merriam-Webster

    — Kathleen Mcwilliams,, "Ben Carson Says HUD Is Committed To Finding A Solution For Homeowners With Failing Foundations," 4 June 2018 According to a state report, a mineral known as pyrrhotite — used in the concrete aggregate for the foundations …

  • Part 1: Pyrrhotite Plague Is Killing The American Dream ...

    The state has to make sure that pyrrhotite-tainted aggregate doesn't again find its way into concrete — whether for homes, commercial jobs or public works, and whether from Becker's or any other ...

  • 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.

  • pyrrhotite Topic - American Concrete Institute

    The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design ...

  • Novel Pyrrhotite Detection Method in Concrete Aggregate ...

    Pyrrhotite is a naturally occurring iron sulfide mineral in the particular chemical form Fe(1-x)S, where x = 0 to 0.125. If pyrrhotite is present in the concrete, then water and oxygen, already present in the hydrated cement, will foster a chemical reaction that produces expansive by-products.

  • Pyrrhotite - an overview | ScienceDirect Topics

    Monoclinic pyrrhotite, however, in contrast to hexagonal pyrrhotite, is magnetic and is recovered in magnetic concentrates. Previous research (Cline and Rosas, 1975; Iwasaki, 1999) has shown that flotation can be used to remove pyrrhotite. The Marcona Mine in Peru uses a reverse flotation process to float pyrrhotite from the

  • Failing Concrete Foundations Linked to Aggregate - Fine ...

    Pyrrhotite, a mineral found in stone aggregate used to make concrete, is the suspected cause of hundreds, possibly thousands, of foundation failures in eastern Connecticut.

  • Pyrrhotite Mineral Data

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  • pyrrhotite uses -

    Pyrrhotite is the suspected cause of concrete durability issues found in the northeast U.S. (Conn.), primarily used for residential foundations. The foundations of interest are experiencing a slow crack development, resulting in the eventual loss of concrete strength.

  • Pyrrhotite |

    pyrrhotite (pĬr´ətīt) or magnetic pyrites, bronze-yellow to bronze-red mineral, a sulfide of iron sometimes containing nickel. It tarnishes easily and is somewhat magnetic. It tarnishes easily …

  • Deteriorating Concrete Foundations -

    The minimum amount of pyrrhotite needed to trigger deterioration is not yet known. Becker's Quarry, the main source of concrete aggregate for JJ Mottes, includes more than trace amounts of pyrrhotite, and is located on a vein of rock that contains significant amounts of pyrrhotite.

  • Pyrrhotite: Mineral information, data and localities.

    Pyrrhotite is found with pentlandite in basic igneous rocks, veins, and metamorphic rocks. It is also often found with pyrite, marcasite, and magnetite. It has varying magnetic powers, depending on the number of Fe vacancies in the crystal structure.