Pyrrhotite dissolution in acidic media

Chiriţă, Paul; Rimstidt, J. Donald

doi:10.1016/j.apgeochem.2013.11.013

Cited by 38 publications

(5 citation statements)

References 42 publications

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“…When pyrrhotite comes into contact with water and oxygen‐containing air, an oxidation reaction occurs, producing Fe 2+ and sulfuric acid (Chiriţă & Rimstidt, 2014). The solubility of plagioclase and alkali feldspar increases from neutral to acidic (Hellmann, 1994; Holdren & Speyer, 1985).…”

Section: Discussionmentioning

confidence: 99%

Mn‐Precipitates Found in a Martian Crustal Rock

Nakamura,

Miyahara,

Suga

et al. 2023

JGR Planets

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Alteration minerals in one of the Martian meteorite nakhlites, Yamato (Y) 000802, were studied to understand the alteration process and conditions. Mn‐precipitates are discovered between altered plagioclase grains in Y 000802. Mn‐precipitates consist of hausmannite (), manganite (γ‐Mn3+OOH), rhodochrosite (Mn2+CO3), and a trace amount of Mn4+O2 mineral. Jarosite ) is also found. Mn2+ dissolved from olivine contributes to the formation of Mn‐precipitates. A weakly acidic‐neutral fluid containing a trace amount of altered the olivine, and Mn2+ was dissolved into the fluid. The fluid also reacted with plagioclase and probably induced dealkalization of plagioclase, causing a local strong alkaline environment. Plagioclase was altered to ferroan saponite‐nontronite + amorphous SiO2 under alkaline conditions. Simultaneously, Mn2+/3+‐precipitates were formed from the Mn2+‐containing fluid in the interstices between the altered plagioclase grains under the strong alkaline reducing environment. These alterations occurred in the deep part of the nakhlite body, where they are isolated from Martian subsurface water, including strong oxidants. The formation of Mn2+/3+‐precipitates may have been triggered by the melting of permafrost caused by an impact event around ∼633 Ma. Later, the nakhlite body was probably excavated by another impact, making it susceptible to water including strong oxidants. Pyrrhotite was dissolved and a highly acidic oxidizing fluid was formed, which would induce the formation of jarosite and the Mn4+O2 mineral between ∼633 Ma and ∼11 Ma.

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Section: Discussionmentioning

confidence: 99%

Mn‐Precipitates Found in a Martian Crustal Rock

Nakamura,

Miyahara,

Suga

et al. 2023

JGR Planets

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“…The surface of pyrrhotite is complex and gives rise to different oxidation mechanisms. Because of the deficiency of Fe atoms at the pyrrhotite surface, oxidation proceeds via the formation of a sulfur-rich layer [35], whereas in the Fe-rich surface layers of pyrite, ferric oxyhydroxide forms during the initial oxidation. Janzen et al [30] studied the oxidation kinetics of 12 well-characterized pyrrhotite samples using oxygen and ferric iron.…”

Section: Effects Of Pyrrhotite Characteristics On Oxidation Potentialmentioning

confidence: 99%

Concrete damage due to oxidation of pyrrhotite-bearing aggregate: a review

Duchesne

Rodrigues²,

Fournier³

2021

RILEM Tech Lett

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Oxidation of pyrrhotite-bearing aggregates is one of the major causes of concrete damage in numerous buildings in Trois-Rivières in Canada and Connecticut in the USA. In the presence of moisture and oxygen, pyrrhotite oxidizes to generate iron-and sulfate-rich secondary minerals that cause internal sulfate attack. Iron sulfides are accessory minerals of different rock types. The distribution of sulfides is often very heterogeneous in terms of aggregate particles, even at the level of the quarries in which some areas may contain copious amounts than others, which complicates the sampling method. Pyrrhotite is a complex mineral with varying chemical composition, crystallographic structure, and specific surface area. These factors influence the reactivity of pyrrhotite. Therefore, it is challenging to control the quality of the aggregate sources. In this study, recent advances in the identification and quantification of pyrrhotite to diagnose complicated cases are presented, and a performance-based approach for the quality control of new sources of aggregates is introduced. The performance-based approach is preferred because it eliminates the influence of the oxidation of pyrrhotite.

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“…Non-oxidative dissolution rates for pyrrhotite (r Hϩ ) were found to obey Equation 4 (Chirita and Rimstidt 2014) in the pH range between 0 and 5 and temperatures between 20°C and 90°C.…”

Section: Solubility Of Iron Sulphidesmentioning

confidence: 99%

Corrosion and Scale Formation in High Temperature Sour Gas Wells: Chemistry and Field Practice

Ramachandran

Al-Muntasheri

Leal

et al. 2015

Day 2 Tue, April 14, 2015

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Sour gas is being produced from a number of carbon-steel-completed wells in the US (Mississippi, Alabama), Canada, France and Saudi Arabia. The gas stream contains various levels of hydrogen sulfide, carbon dioxide and is produced from high temperature reservoirs (with temperatures ranging from 160 to 410°F). The combination of hydrogen sulfide with high temperatures introduces challenges related to corrosion and iron sulfide (FeS) scale formation. The thermodynamics and kinetics of iron sulfide formation will be reviewed. There is a large literature on the thermodynamics and kinetics of iron sulfide scales in the context of corrosion of mild steel. High temperatures and high concentration of hydrogen sulfide favor the formation of pyrrhotite and trolite which are an order of magnitude less soluble than cubic FeS or mackinawite. Saudi Aramco has been producing sour gas from deep carbonate reservoirs since 1984. The mole percentage of hydrogen sulfide (H 2 S) in the gas of these wells range from 1 to 23, while the mole percentage of carbon dioxide in the gas range from 3.7 to 8. Bottomhole temperatures vary from 265 to 320°F. Corrosion inhibition treatment has been sporadic. Chemical and mechanical methods of scale removal have been used in different wells. In a specific instance, the amount of scale has been measured from a given well and the composition has been noted as a function of depth. Assessment about the amount of scale and the potential sources of iron will be provided. Thermodynamic studies of iron sulfide scales will also be reported to explain some of the field observations. The paper provides a summary of the current fundamental understanding in iron sulfide scale (FeS) and corrosion kinetics. It reveals that many oilfield operators do have special stimulation procedures for these wells. These include: special acid stimulation packages, well pickling and processes for continuous injection of corrosion inhibitors to mitigate the iron sulfide scale problems. Results and analysis concerning corrosion and scale problems for specific wells in deep hot gas wells will be presented. The paper will provide a reference point for iron sulfide scale problems in high temperature sour gas wells and for future development in the area.

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Pyrrhotite dissolution in acidic media

Cited by 38 publications

References 42 publications

Mn‐Precipitates Found in a Martian Crustal Rock

Mn‐Precipitates Found in a Martian Crustal Rock

Concrete damage due to oxidation of pyrrhotite-bearing aggregate: a review

Corrosion and Scale Formation in High Temperature Sour Gas Wells: Chemistry and Field Practice

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