Gypsum Solubility Under Alkaline

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  • Gypsum Solubility Under Alkaline

P solubility and release kinetics in the leachate of …

This study attempted to characterize the P release behavior of the saline–sodic soil amended with gypsum alone (G25 and G50: 25 and 50% gypsum requirement:) or with farmyard manure (G25FYM) and city waste compost from Karnal (G25CK) and Delhi (G25CD). ... under alkaline compared to salinity. Saline/alkaline stress was the primary driver of ...

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The Influences of Soluble Phosphorus on Hydration Process …

Phospho-gypsum is mainly composed of CaSO 4 ·2H 2 O, and other complex impurities such as soluble phosphorus, soluble fluorine, organics, or alkali metal salts. ... In this study, the influence of soluble phosphorus on the hydration process and the mechanism of calcined gypsum under deep retarding condition were studied. The data showed that ...

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Effects of soil amendments on fractions and stability of …

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 CaSO 4 treatment. Clearly, water soluble Ca 2+ showed a significant increase under application of CaSO 4 (by 1156–3018 mg kg −1 ) and biochar (by 791–1138 mg kg −1 ...

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Combined Application of Organic Amendments and Gypsum …

Saline–alkali soils have high sodicity, high pH, and high levels of soluble salts, as well as carbonates. This study aimed to evaluate the effect of cattle manure and chicken manure combined with gypsum at three levels on reclaiming a saline–alkali soil, through a soil column experiment. Combined treatments were more effective than those of sole gypsum in reducing …

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Gypsum solubility in water at 25°C | Geochemistry …

The analysis of published data and our experimental results showed that the existing estimates of gypsum solubility in water (C m ↑) at 25°C range from 0.0147 to 0.0182 M. Such a scatter (more than 20%) is the result of a combined influence of experimental conditions and ability of gypsum to form supersaturated solutions. This influence appears most noticeable …

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Dehydration Pathways of Gypsum and the Rehydration Mechanism of Soluble

where r ij and σ ij are the actual and reference distances between atoms i and j, respectively; ε o is the permittivity of free space (ε o = 8.8543 × 10 –12 C 2 J –1 m –1); ε ij is the potential well-depth; and q i and q j are the value of the charge on atoms i and j.The LJ interactions between unlike atoms are treated with the sixth-order mixing rule. 20 The atom-based summation ...

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Integrating column leaching experiments and geochemical …

This was primarily attributed to the precipitation of soluble alkali compounds (e.g. NaOH, Na2CO3, NaHCO3, NaAl(OH)4, KOH, K2CO3)[34] to more stable calcite, tri-calcium aluminate, hydrocalumite, and other calcium aluminate minerals during the treatment with gypsum [33,35–38], which exhibit lower solubility and therefore give lower alkaline ...

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Gypsum: an old product with a new use | Integrated Crop …

Gypsum is calcium sulfate (CaSO 4).Refined gypsum in the anhydrite form (no water) is 29.4 percent calcium (Ca) and 23.5 percent sulfur (S). Usually, gypsum has water associated in the molecular structure (CaSO 4 ·2H2O) and is approximately 23.3 percent Ca and 18.5 percent S (plaster of paris). Gypsum fertilizer usually has other impurities so grades are approximately 22 …

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Phosphogypsum stabilization of bauxite residue: Conversion …

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 phosphogypsum were similar, as both materials can provide excess calcium to precipitate soluble alkali (Kopittke et al., 2005, Jones et al., 2012). Notably, phosphogypsum ...

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Prediction of halite, gypsum, and anhydrite solubility in …

DOI: 10.1016/0098-3004(93)90039-8 Corpus ID: 129772192; Prediction of halite, gypsum, and anhydrite solubility in natural brines under subsurface conditions @article{He1993PredictionOH, title={Prediction of halite, gypsum, and anhydrite solubility in natural brines under subsurface conditions}, author={Shiliang He and John W. Morse}, journal={Computers & Geosciences}, …

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Gypsum solubility in seawater, and its application to bauxite …

The solubilities and dissolution rates of three gypsum sources (analytical grade (AG), phosphogypsum (PG) and mined gypsum (MG)) with six MG size fractions ((mm) > 2.0, 1.0-2.0, 0.5-1.0, 0.25-0.5, 0.125-0.25, and PG > MG) due to reactivity and surface area differences, with 1:20 gypsum:solution suspensions reaching saturation within 15 s (AR) to 30 min (MG > …

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Preparation of calcium carbonate by indirect carbonation

As an industrial by-product of flue gas desulfurization, flue gas desulfurization gypsum (FGD gypsum), whose main component is CaSO 4 · 2H 2 O, is an ideal raw material for mineralization. The technical problem of indirect mineralization lies in the efficient recycling of leaching agents, while amino acids have the lowest solubility at their isoelectric point, and thus …

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