The products of selenite hydrothermal treatment in lithium chloride solutions

Marinkovic, S.; Kostic-Pulek, A.; Djuricic, Mirjana

doi:10.2298/jsc0004265m

Cited by 6 publications

(9 citation statements)

References 2 publications

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“…As for the KCl−CaSO 4 −H 2 O system, Li reported that pure α-HH could be prepared in KCl solution with or without additives. In contrast, Marinkovic and Kostic-Pulek showed that the product obtained in 1.0 M KCl solution was β-HH, and α-HH mixed with potassium pentacalcium sulfate monohydrate (goergeyite, Go) was the product in more concentrated KCl solution ((1.5 to 4) M). No explanation of the difference between their results was offered.…”

Section: Introductionmentioning

confidence: 99%

Crystallization Routes and Metastability of α-Calcium Sulfate Hemihydrate in Potassium Chloride Solutions under Atmospheric Pressure

Guan

et al. 2009

J. Chem. Eng. Data

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The phase transitions of α-calcium sulfate hemihydrate (α-HH) in KCl solutions were studied at (80 to 105) °C under atmospheric pressure in an attempt to estimate the metastability of α-HH and to sketch out the routes for α-HH’s hydration, dehydration, or recrystallization. The crystal water content and morphology of the product during the reaction period were comprehensively examined. It was found that the metastability of α-HH heavily relied on KCl concentration and temperature. The phase transition of α-HH is successfully outlined as a function of KCl concentration and temperature. Calcium sulfate dihydrate (DH) is stable in region I and metastable in region III. Anhydrite (AH) is stable in regions III and IV and coexists with goergeyite. HH is metastable in only region II. The results show that α-HH tends to hydrate or dehydrate in KCl solution, but there is still a narrow metastable region for α-HH crystallization in which KCl concentration and temperature are strictly limited.

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Section: Introductionmentioning

confidence: 99%

Crystallization Routes and Metastability of α-Calcium Sulfate Hemihydrate in Potassium Chloride Solutions under Atmospheric Pressure

Guan

et al. 2009

J. Chem. Eng. Data

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“…CaSO 0.5H O+1.5H O=CaSO 2H O   -CaSO 4 0.5H 2 O is produced by "wet process", e.g. by cooking of gypsum in a liquid medium at its temperature of boiling at atmospheric pressure, often in concentrated water salt solutions as 2M and 3M KCl (Marinković et al 1999) or 2M and 3M LiCl (Marinkovic et al 2000). This kind of hemihydrate is primary applicable in medicine and stomatology, but also it can be utilized in sculpture and for fine works in construction.…”

Section: Gypsummentioning

confidence: 99%

Examination of the possibilities of the application of waste materials (gypsum, fly ash and bottom ash) in construction

Trifunovic¹,

Marinkovic²,

Kostic-Pulek³

et al. 2014

Pod Rad

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The possibilities of the application of waste gypsum (citrogypsum, nitrogyosum and sulphogypsum), fly ash and bottom ash in construction: for production of gypsum binders (-calcium sulphate hemihydrate, -calcium sulphata hemihydrate and -anhydrite), for obtaining construction products (bricks and blocks) and as component materials for road layers were presented in this work. Also, the possibilities of the application of sulphogypsum (or FGD gypsum) for solidification and stabilization of fly ash were presented. The obtained results could have great importance in both ecological and economic views (elimination of important pollutants of water, air and soil, replacement of natural by waste materials, reduction of waste disposal cost).

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“…Therefore, an alternative approach for the preparation of α‐HH by the hydrothermal method has been suggested. This procedure involves the heating of gypsum in boiling or near‐boiling solutions of inorganic acids or their salts, such as H 2 SO 4 , KCl, CaCl 2 , and MgCl 2 9–12 , under atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, an alternative approach for the preparation of a-HH by the hydrothermal method has been suggested. This procedure involves the heating of gypsum in boiling or nearboiling solutions of inorganic acids or their salts, such as H 2 SO 4 , KCl, CaCl 2 , and MgCl 2 [9][10][11][12] , under atmospheric pressure. The dominant mechanism of a-HH formation by the hydrothermal method is a reaction of DH dissolution in the electrolytic solution, followed by crystallization (the so-called through-solution reaction mechanism).…”

Section: Introductionmentioning

confidence: 99%

Effect of Potassium Sodium Tartrate and Sodium Citrate on the Preparation of α‐Calcium Sulfate Hemihydrate from Flue Gas Desulfurization Gypsum in a Concentrated Electrolyte Solution

Shen

Guan

et al. 2009

Journal of the American Ceramic Society

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Flue gas desulfurization (FGD) gypsum mainly composed of calcium sulfate dihydrate (DH) was used as a raw material to obtain α‐calcium sulfate hemihydrate (α‐HH) through dehydration in a Ca–Mg–K–Cl‐solution medium at 95°C under atmospheric pressure. The effects of potassium sodium tartrate and sodium citrate on the preparation of α‐HH in the electrolyte solution were investigated. The results revealed that the addition of potassium sodium tartrate (1.0 × 10−2–2.5 × 10−2M) decreased the dehydration rate of FGD gypsum and increased the length/width (l/w) ratio of α‐HH crystals, which could yield unfavorable strength properties. Addition of sodium citrate (1.0 × 10−5– 2.0 × 10−5M) slightly increased the dehydration rate of FGD gypsum and decreased the l/w ratio of α‐HH crystals, which could be beneficial to increase strength. However, it also led to a partial formation of anhydrite (AH) crystals. AH was also the only dehydration product when the concentration of sodium citrate increased to 1.0 × 10−4M. Therefore, sodium citrate rather than potassium sodium tartrate could be used as an additive in Ca–Mg–K–Cl electrolyte solutions if α‐HH with a shorter l/w ratio is the desired product from FGD gypsum dehydration. The concentration of sodium citrate should be properly controlled to reduce the formation of AH.

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The products of selenite hydrothermal treatment in lithium chloride solutions

Cited by 6 publications

References 2 publications

Crystallization Routes and Metastability of α-Calcium Sulfate Hemihydrate in Potassium Chloride Solutions under Atmospheric Pressure

Crystallization Routes and Metastability of α-Calcium Sulfate Hemihydrate in Potassium Chloride Solutions under Atmospheric Pressure

Examination of the possibilities of the application of waste materials (gypsum, fly ash and bottom ash) in construction

Effect of Potassium Sodium Tartrate and Sodium Citrate on the Preparation of α‐Calcium Sulfate Hemihydrate from Flue Gas Desulfurization Gypsum in a Concentrated Electrolyte Solution

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