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calcium carbonate and sulphuric acid react to form

2012-12-21  oxidation of pyrite, producing sulphuric acid, which in turn can react with calcium carbonate (calcite) to form gypsum. » More detailed Specialist Testing and

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Gypsum growth induced by pyrite oxidation

2018-10-15  Iron ions also recombined to form iron oxyhydroxides. Another consequence of pyrite oxidation was the dissolution of calcite, present in the vicinity of pyrite-rich layers, which freed calcium and carbonates ions. The formers then reacted with sulphates ions, so as to form gypsum.

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The Disruptive Potential of Pyritic Shale Fill - WJE

pyritic degradation can react with the calcium carbonate (CaCO 3) component inherent to common fill material such as limestone to form gypsum (CaSO 4). Since the products of gypsum formation occupy much larger volumes than the materials consumed, this process is expansive. As a result, fills containing significant amounts

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Missouri University of Science and Technology Scholars'

2021-4-12  The expansion of the shale could be attributed to the oxidation of the pyrite, which produced sulfuric acid. The sulfuric acid, in turn, reacted with the calcium carbonate (calcite) in the shale partings producing the mineral gypsum. Since gypsum has approximately twice the molar volume of calcite, the result is an expansion or swelling of the shale.

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Pyrite-related damage - Taylor Tuxford

2018-3-16  Calcium carbonate reacts in the presence of acids to release carbon dioxide gas and calcium ions into solution. The calcium ions in turn react with the sulphate

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Dynamics of pyrite formation and organic matter ...

2018-9-30  4), the most stable and common form being pyrite (FeS 2)(Goldhaber and Kaplan, 1974; Rickard and Luther, 2007). Sulfate anions may precipitate in evaporative envi-ronments as gypsum (CaSO 4 2H 2O) and anhydrite (CaSO 4), or in normal marine environments as barite (BaSO 4) and carbonate associated sulfate (CAS), and these

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Pyrite Investigations Expert Witness: Ballymun Youth ...

In such conditions, pyrite will oxidise to form sulfuric acid (H 2 SO 4) and other products. The acid may in turn react with other minerals found in the rock. If calcium carbonate is present in the rock, it will react with the sulfuric acid to form calcium sulfate (CaSO 4.2H 2 O) in the form of gypsum. Gypsum, formed in the manner described, has a significantly greater volume, approximately twice that of the source pyrite.

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Dynamics of pyrite formation and organic matter ...

2018-11-15  Reduced S species formed by MSR can react with reactive Fe and organic compounds in depositional environments to form both pyrite and organic S compounds (Goldhaber and Kaplan, 1974, Sinninghe and De Leeuw, 1990, Rickard and Luther, 2007). The preserved S isotope composition of pyrite and organic S depends on the microbial fractionation during MSR and on the suite of processes

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Gypsum deposits associated with the Whitehill

The calcium and sulphate ions required to form the gypsum mineral (CaSO4•2H2O) are derived from the mid- to lower-shale of the Whitehill Formation, which is carbonate- and pyrite-rich. Gypsum formation is dependent on the availability of pyrite as opposed to calcite, which is in abundance throughout the 30m thick, Early Ufimian (late Permian) Whitehill Formation.

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University of Nebraska - Lincoln

2019-10-25  carbonate content of a sample can be determined by reaction with acid, in a closed system, to form . COz. At . constant temperature, the increase in pressure is linearly related to the quantity of carbonate present in the sample. The slope, a, of the equation, CaC03 = a (H) + b. where . His . the pressure and a an. b . are empirically determined constants, is lessd

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Dynamics of pyrite formation and organic matter ...

2018-9-30  fide and other reduced S species in sediments react with metals such as Fe to form 34S depleted Fe sulfides (e.g., FeS, Fe 3S 4), the most stable and common form being pyrite (FeS 2)(Goldhaber and Kaplan, 1974; Rickard and Luther, 2007). Sulfate anions may precipitate in evaporative envi-ronments as gypsum (CaSO 4 2H 2O) and anhydrite (CaSO

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Pyrite-related damage - Taylor Tuxford

2018-3-16  Calcium carbonate reacts in the presence of acids to release carbon dioxide gas and calcium ions into solution. The calcium ions in turn react with the sulphate from the acid to form gypsum (CaSO 4.2H 2 O). The pyrite crystals found in the mudstone

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Dynamics of pyrite formation and organic matter ...

2018-11-15  Hydrogen sulfide and other reduced S species in sediments react with metals such as Fe to form 34 S depleted Fe sulfides (e.g., FeS, Fe 3 S 4), the most stable and common form being pyrite (FeS 2) (Goldhaber and Kaplan, 1974, Rickard and Luther, 2007).

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Pyrite Oxidation Controlled Siderophile Element ...

The sulfuric acid produced by pyrite oxidation was neutralized by calcium carbonate in the marls to form gypsum. Selenium (normally a sulfur analog) is undetectable in the El Kef gypsum endmember (Se/S~0), unlike marine gypsum, supporting a formation by pyrite oxidation. This observation potentially explains the ubiquitous non-chondritic ...

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Pyrite Investigations Expert Witness: Ballymun Youth ...

The acid may in turn react with other minerals found in the rock. If calcium carbonate is present in the rock, it will react with the sulfuric acid to form calcium sulfate (CaSO 4.2H 2 O) in the form of gypsum. Gypsum, formed in the manner described, has a significantly greater volume, approximately twice that of the source pyrite.

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University of Nebraska - Lincoln

2019-10-25  carbonate content of a sample can be determined by reaction with acid, in a closed system, to form . COz. At . constant temperature, the increase in pressure is linearly related to the quantity of carbonate present in the sample. The slope, a, of the equation, CaC03 = a (H) + b. where . His . the pressure and a an. b . are empirically ...

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Coupling of Carbonate Associated Sulfate and Carbon ...

2019-9-12  These sulfides then react with metals, prominently iron, to form metal M 2+ sulfides (e.g., FeS 2). Oxidation of terrestrial sulfides, such as those found in exposed pyrite deposits, through weathering is a source of isotopically light sulfur into the oceans.

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PROPERTIES OF MINERALS IN HAND-SAMPLE

2011-8-29  Acids react with carbonate minerals to release carbon dioxide in an effervescent reaction. Calcite and aragonite react with cold, dilute HCl in the following reaction: CaCO 3 + 2H +1 → Ca+2 + H 2 O + CO 2. Dolomite will react when powdered or if the acid is heated. Other carbonate minerals such as

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Determining the Gypsum Requirement for Reclamation of ...

talized and will react more slowly than gypsum produced during phosphate fertilizer production or from flue gas desulfurization. In soils containing calcium carbonate, alternatives to gypsum can be effective. Mineral lime (calcium carbonate) in these soils can be converted to gypsum by

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The "Acid Test" for Carbonate Minerals and Carbonate

2017-9-11  These react to form carbon dioxide gas (CO 2), water (H 2 O), dissolved calcium (Ca ++), and dissolved chlorine (Cl--). The carbon dioxide bubbles that you observe are evidence that the reaction is taking place. When that occurs, calcite or another carbonate mineral is present. Many other carbonate minerals react with hydrochloric acid.

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Dynamics of pyrite formation and organic matter ...

2018-9-30  fide and other reduced S species in sediments react with metals such as Fe to form 34S depleted Fe sulfides (e.g., FeS, Fe 3S 4), the most stable and common form being pyrite (FeS 2)(Goldhaber and Kaplan, 1974; Rickard and Luther, 2007). Sulfate anions may precipitate in evaporative envi-ronments as gypsum (CaSO 4 2H 2O) and anhydrite (CaSO

MoreOnline Chat

Pyrite Oxidation Controlled Siderophile Element ...

The sulfuric acid produced by pyrite oxidation was neutralized by calcium carbonate in the marls to form gypsum. Selenium (normally a sulfur analog) is undetectable in the El Kef gypsum endmember (Se/S~0), unlike marine gypsum, supporting a formation by pyrite oxidation. This observation potentially explains the ubiquitous non-chondritic ...

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Pyrite Testing - Ireland

2016-5-24  Pyrite is a naturally occurring mineral which may be present in sedimentary rock deposits. When pyrite is exposed to oxygen and moisture it oxidises and produces sulphuric acid which then may react with calcium carbonates in the backfill to form gypsum which results in the swelling of the backfill. Mattest provide affordable testing sampling ...

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Coupling of Carbonate Associated Sulfate and Carbon ...

2019-9-12  These sulfides then react with metals, prominently iron, to form metal M 2+ sulfides (e.g., FeS 2). Oxidation of terrestrial sulfides, such as those found in exposed pyrite deposits, through weathering is a source of isotopically light sulfur into the oceans.

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Using Pyrite-Rich Cyanide Tailings - MDPI

2020-10-26  The pyrite decomposes into Fe2O3 and SO2, and they react with CaO and Al2O3 to form the intermediates of CaSO4, 2CaOFe2O3, and CaO2Al2O3, which further react to form 3CaO3Al2O3CaSO4, 4CaOAl2O3Fe2O3, and 12CaO7Al2O3. The calcium sulphoaluminate cement prepared by pyrite-rich cyanide tailings exhibits excellent mechanical properties and meets the ...

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Part C: Assessing the aggressive chemical environment

2004-12-22  4 will further react with it to produce calcium sulfate which crystallises as gypsum (CaSO 4.2H 2O). • In the presence of calcium, up to 1400 mg/l of sulfate ions (SO 4) may remain in solution in groundwater. If there is insufficient calcium carbonate to neutralise the

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PROPERTIES OF MINERALS IN HAND-SAMPLE

2011-8-29  Acids react with carbonate minerals to release carbon dioxide in an effervescent reaction. Calcite and aragonite react with cold, dilute HCl in the following reaction: CaCO 3 + 2H +1 → Ca+2 + H 2 O + CO 2. Dolomite will react when powdered or if the acid is heated. Other carbonate minerals such as

MoreOnline Chat

Determining the Gypsum Requirement for Reclamation of ...

talized and will react more slowly than gypsum produced during phosphate fertilizer production or from flue gas desulfurization. In soils containing calcium carbonate, alternatives to gypsum can be effective. Mineral lime (calcium carbonate) in these soils can be converted to gypsum by

MoreOnline Chat

Urea Hydrolysis and Calcium Carbonate Precipitation in ...

Gypsum is a moderately soluble Ca-salt, and its dissolution should create a source of Ca 2+ Water content that can react with litter carbonates as described by Burt et al. (2017), which should decrease both litter pH and subsequent NH 3 volatilization. Currently, there are no known studies that evaluate the effect of gypsum on urease activity ...

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The "Acid Test" for Carbonate Minerals and Carbonate

2017-9-11  These react to form carbon dioxide gas (CO 2), water (H 2 O), dissolved calcium (Ca ++), and dissolved chlorine (Cl--). The carbon dioxide bubbles that you observe are evidence that the reaction is taking place. When that occurs, calcite or another carbonate mineral is present. Many other carbonate minerals react with hydrochloric acid.

MoreOnline Chat

Pyrite Oxidation Controlled Siderophile Element ...

The sulfuric acid produced by pyrite oxidation was neutralized by calcium carbonate in the marls to form gypsum. Selenium (normally a sulfur analog) is undetectable in the El Kef gypsum endmember (Se/S~0), unlike marine gypsum, supporting a formation by pyrite oxidation. This observation potentially explains the ubiquitous non-chondritic ...

MoreOnline Chat

Pyrite Testing - Ireland

2016-5-24  Pyrite is a naturally occurring mineral which may be present in sedimentary rock deposits. When pyrite is exposed to oxygen and moisture it oxidises and produces sulphuric acid which then may react with calcium carbonates in the backfill to form gypsum which results in the swelling of the backfill. Mattest provide affordable testing sampling ...

MoreOnline Chat

PROPERTIES OF MINERALS IN HAND-SAMPLE

2011-8-29  Acids react with carbonate minerals to release carbon dioxide in an effervescent reaction. Calcite and aragonite react with cold, dilute HCl in the following reaction: CaCO 3 + 2H +1 → Ca+2 + H 2 O + CO 2. Dolomite will react when powdered or if the acid is heated. Other carbonate minerals such as

MoreOnline Chat

Study on the oxidation and acid corrosion of the black shale

maintain the pH of solution. The formed gypsum will produce tensile stress on concrete and lead to structure damage of the concrete. What’s more, the sulfate ions produced from pyrite oxidation can react with magnesium and sodium ions as well as to form various sulfate hydrated (Eq. 3, Eq.4): Mg2++ SO 4

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Using Pyrite-Rich Cyanide Tailings - MDPI

2020-10-26  The pyrite decomposes into Fe2O3 and SO2, and they react with CaO and Al2O3 to form the intermediates of CaSO4, 2CaOFe2O3, and CaO2Al2O3, which further react to form 3CaO3Al2O3CaSO4, 4CaOAl2O3Fe2O3, and 12CaO7Al2O3. The calcium sulphoaluminate cement prepared by pyrite-rich cyanide tailings exhibits excellent mechanical properties and meets the ...

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16.4: Mineral Resources - Geosciences LibreTexts

2021-2-14  These metamorphic rocks form as magma-derived, highly saline metalliferous fluids react with carbonate rocks, creating calcium-magnesium-silicate ... sulfides such as pyrite react undergo complex reactions to release metal ions and hydrogen ions, lowering pH to highly acidic levels. ... water softener, or a de-icer for roads. Gypsum is a common ...

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Weathering of primary minerals and mobility of major ...

2007-5-25  Calcium released is leached or reacts with the sulphate ions to form gypsum. Magnesium, aluminium and potassium tend to leach from the uppermost millimetres of the soil, accumulating where the pH>/=5.0; also the iron, probably forming more or less

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Urea Hydrolysis and Calcium Carbonate Precipitation in ...

Gypsum is a moderately soluble Ca-salt, and its dissolution should create a source of Ca 2+ Water content that can react with litter carbonates as described by Burt et al. (2017), which should decrease both litter pH and subsequent NH 3 volatilization. Currently, there are no known studies that evaluate the effect of gypsum on urease activity ...

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Understanding the Potential Problem with High

2016-1-29  •High Ca concentrations will react to form Calcium carbonate or line. ... increasing the solubility of calcium phosphates. • Higher calcium carbonate in soils increases pH making many nutrients less available. ... with bicarbonates to form gypsum and

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The "Acid Test" for Carbonate Minerals and Carbonate

2017-9-11  These react to form carbon dioxide gas (CO 2), water (H 2 O), dissolved calcium (Ca ++), and dissolved chlorine (Cl--). The carbon dioxide bubbles that you observe are evidence that the reaction is taking place. When that occurs, calcite or another carbonate mineral is present. Many other carbonate minerals react with hydrochloric acid.

MoreOnline Chat

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