(PDF) Effect of Gypsum (CaSO4.2H2O) on Soil Bulk Density, …

Leaching of soluble calcium, magnesium and sodium chlorides, somewhat greater than that in normally tilled soil, occurred especially from between 40 and 120 cm in the …

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Phosphogypsum stabilization of bauxite residue: Conversion of its

As Jones et al. (2015) reported, Ca 2 + could react with soluble alkaline anions such as CO 3 2 −, HCO 3 −, OH − and Al(OH) 4 −. The mechanisms of both gypsum and …

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Effect of gypsum rates and lime with different reactivity on soil

The low solubility of lime (CaCO 3) and the absence of soil disturbance in fields under no-tillage (NT) may diminish the effectiveness of surface to reduce exchangeable …

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Measured Log(Tind) for gypsum as a function of salinity in...

Log(Tind) data points are from He et al. [77]; the calculated solubility data were calculated with the pitzer.dat database in PHREEQC 2.18 for 25 °C. from publication: Gypsum Precipitation under ...

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Integrating column leaching experiments and geochemical …

In this study, by integrating the geochemical modelling of PHREEQC and column leaching experiments, the dissolution of alkaline solids in bauxite residue (BR) and gypsum …

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Effect of Combined Application of Desulfurization Gypsum and …

Saline-alkali soil imposes severe adverse effects on soil utilization and agriculture production worldwide. Amelioration of saline-alkali soil is crucial to ensure global food security …

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Effect of Gypsum Placement on the Physical Chemical Properties of …

Similar to the views by Frenkel et al. (1989); Koo et al. (1990) and Qadir et al. (2003), reduced ESP in our study could also imply greater effective solubility of gypsum since the cation …

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Conceptual and Practical Framework to Address Gypsum

Gypsum is a soluble-sulfate salt (~2.4 g L −1 at 0 ℃), with a low salt index and neutral reaction in the soil (Gowariker et al. 2008).These attributes, alongside its wide …

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GYPSUM

Under state legislation in Australia, gypsum is categorised into several grades depending on its purity. The minimum concentrations are: Grade 1 > 15% S > 19% Ca Grade 2 > 12.5% S > …

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Effects of soil amendments on fractions and stability of soil …

Although the reduction of water soluble Na + was not significant in HF soil under all amendments, there was a modest decrease in water soluble Na + (by 43 mg kg −1) under …

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Geochemical and equilibrium trends in mine pit lakes

The solubilities of 3 possible Al sulfate minerals, basaluminite [Al 4 (OH) 10 SO 4], jurbanite [AlOHSO 4] and alunite [KAl 3 (SO 4) 2 (OH) 6], are shown in Fig. 7 for conditions …

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The benefits of gypsum for sustainable management and …

Background Gypsum is a valuable resource for farmers, supplying essential calcium and sulfur for plant growth. It serves as a crucial soil amendment, particularly in reclaiming …

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Frontiers | The combined application of salt-alkali tolerant …

Armstrong (1989) compared the solubility, exchangeable sodium replacement, and clay dispersion inhibition of three calcium amendments (PG, rock gypsum, saturated gypsum …

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Understanding gypsum in 3 diagrams

Under such conditions, most of the physically-bound water will evaporate. After this, the chemically-bound water can be measured accurately. ... For gypsum, a nearly …

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Calcium Sulfate

Calcium sulfates have been observed in high-temperature fields under seawater flooding where Ca-rich formation water and seawater mix in the production well at elevated seawater …

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(PDF) Solubility of gypsum and its prediction in …

The solubility of gypsum in different salt solutions containing Ca, Mg, Na, Cl, and SO4 was determined experimentally at 298 [degrees] K. Sixteen subprograms were developed by using five...

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Gypsum Rock and Water/Crude Oil Interaction During Crude-Oil …

The solubility of gypsum in brine solution also increases with temperature (Zhang et al. 2013). In contrast, the solubility of gypsum in alkaline solution decreases with higher …

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Solubility of gypsum at temperatures 0, 25, and 40 °C …

Gypsum (CaSO4‧2H2O), which has a low solubility in water (2.6 g/L at 25 °C), creates a long-lasting insulating layer. Natural mineral formation happens very slowly, and only a small amount...

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Temperature Dependence of Mineral Solubility in Water. Part 3.

Solubility measurements and predictions of gypsum, anhydrite, and calcite over wide ranges of temperature, pressure, and ionic strength with mixed electrolytes Rock Mech. …

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Gypsum Precipitation under Saline Conditions: …

Gypsum (CaSO4·2H2O) is the most common sulfate mineral on Earth and is also found on Mars. It is an evaporitic mineral that predominantly precipitates from brines. In addition to its precipitation in natural environments, …

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Phosphorus fractions and speciation in an alkaline, manured …

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, …

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Mineral scaling in membrane desalination: Mechanisms, …

For example, as shown in Fig. 2 A, gypsum solubility is constant over the pH range of most natural waters, ... As shown in Fig. 2 B, the formation of Mg-silicate is favored under …

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Modeling gypsum (calcium sulfate dihydrate) solubility in aqueous

Wang et al. [39] theoretically investigated the gypsum solubility in the aqueous solutions of MgSO 4 /H 2 SO 4 from 298.1 K to 363.1 K on the basis of the Pitzer model's …

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Gypsum Soils—Their Morphology, Classification, Function, and Landscapes

Gypsum is slightly water soluble under normal conditions and exhibits a retrograde solubility becoming less soluble at temperatures higher than 42 ... While accumulations of …

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Gypsum as a Soil Amendment FSA2199

al., 2020). While gypsum is considerably less soluble than ammonium sulfate, gypsum is soluble enough to provide plant-available calcium and sulfur in a short time following its application. ...

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Gypsum solubility (at 25 °C) and logarithm of rate coefficients for

Gypsum solubility (at 25 °C) and logarithm of rate coefficients for gypsum growth at a range of temperatures (25 °C, 50 °C, 70 °C, and 90 °C) in stoichiometric solutions as a function of ...

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Dissolution and conversions of gypsum and anhydrite

The solubility of gypsum at 20°C is 2.531 g/L or 14 mM/L, which is roughly 140 times lower than the solubility of common salt, but two orders of magnitude greater than the solubility …

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Solubility of Gypsum in Aqueous Solutions of Certain …

Effect of Ionic Liquid Additives on the Solubility Behavior and Morphology of Calcium Sulfate Dihydrate (Gypsum) in the Aqueous Sodium Chloride System and Physicochemical Solution Properties at 30 °C.

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Why Gypsum Works in Your Soil: Part 3 Gypsum …

Gypsum has been used for centuries to reclaim sodium affected soils (alkali soils). It is effective since it has good solubility regardless of soil pH. In fact, its solubility is enhanced in sodic soils. Some data would suggest that the …

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(PDF) Gypsum Precipitation under Saline Conditions: …

2.3. Effects of Temperature and Composition on Gypsum Solubility 2.3.1. Range of Gypsum Stability As gypsum is a mineral with significant importance in natural and industrial …

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