Crystallization of calcium sulfate dihydrate under simulated conditions of phosphoric acid production in the presence of aluminum and magnesium ions

Rashad, M.M.; Mahmoud, M. H. H.; Ibrahim, I. A.; Abdel-Aal, E.A.

doi:10.1016/j.jcrysgro.2004.03.060

Cited by 98 publications

(73 citation statements)

References 9 publications

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“…Brucite crystals are smaller than gypsum crystals which can be seen as wider peaks in the XRD pattern. Rashad et al (2004) have studied the effect of Al 3þ and Mg 2þ ions on gypsum crystallization under simulated conditions of phosphoric acid manufacturing. They have observed a higher nucleation rate in the presence of 1% MgO (Rashad et al, 2004).…”

Section: Magnesium Speciationmentioning

confidence: 99%

The effect of magnesium on partial sulphate removal from mine water as gypsum

Tolonen

Rämö

Lassi

2015

Journal of Environmental Management

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Section: Magnesium Speciationmentioning

confidence: 99%

The effect of magnesium on partial sulphate removal from mine water as gypsum

Tolonen

Rämö

Lassi

2015

Journal of Environmental Management

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“…However, gypsum, like many by-products deal with, precipitates consisting of large number of a few microns and shows a wide particle size distribution. In some cases, fine gypsum crystals are often modified in the presence of additives in order to improve their filtration characteristics and reduce the cost of separation process [3]. The excess of sulfate in the reaction slurry is widely used in industrial application to improve gypsum crystallization quality.…”

Section: Introductionmentioning

confidence: 99%

Influence of citric acid on calcium sulfate dihydrate crystallization in aqueous media

Titiz‐Sargut¹,

Sayan

Avcı

2007

Cryst. Res. Technol.

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The crystallization of Calcium sulfate dihydrate produced by the reaction between pure Ca(OH) 2 suspension and H 2 SO 4 solution was investigated at different pH values, temperatures and citric acid concentrations. Crystal size distributions, filtration rates and zeta potentials of gypsum were determined as a function of citric acid concentrations at pH 3.5 and 65°C. The influence of citric acid on the morphology of gypsum was also investigated and discussed. The average particle size of gypsum was reached to maximum in the presence of approximately 2500 ppm citric acid concentration, where the minimum cake resistance and maximum filtration rate were obtained. In the presence of citric acid, various crystal morphologies such as tabular, platelike, double-taper leaf-like and flower-like, etc., were obtained. The change of morphology is related to the preferential adsorption of citric acid on different crystallographic faces.

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“…Well water produces the most pronounced increase in the water powder ratio of both plaster and stone specimens was achieved with, this is due to that type of water contain large amount of calcium and magnesium sulphate ions (CaSO 4 and MgSO 4 ) Table (1). These ions make the well water as hard water (28,29) i.e hard dispersion of the ions of well water between gypsum particles and thereby increasing their water powder ratio.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Different Water Types on The Water Powder Ratio of Dental Gypsum Products

Taqa¹,

Mohammed²,

Alomari³

2012

RDENTJ

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‫األهداف‬ : ‫ل‬ ‫األسٌبى‬ ‫حجز‬ ‫لوبدة‬ ‫الوسحىق‬ ‫إلى‬ ‫الوبء‬ ‫ًسبت‬ ‫على‬ ‫الوٍبٍ‬ ‫هي‬ ‫هخخلفت‬ ‫أًىاع‬ ‫حأثٍز‬ ‫حمٍٍن‬ . ‫وطر‬ ‫المواد‬ ‫ائ‬ ‫العمل‬ ‫ق‬ : ‫الذراست‬ ‫هذٍ‬ ‫فً‬ ‫خوس‬ ‫اسخخذام‬ ‫حن‬ ‫ة‬ ‫الوٍبٍ‬ ‫هي‬ ‫هخخلفت‬ ‫أًىاع‬ ( ‫البئز‬ ‫هبء‬ ‫و‬ ‫غٍزاالٌىًً‬ ‫الوبء‬ ‫الحٌفٍت،‬ ‫،هبء‬ ‫المىام‬ ‫رلٍك‬ ‫هالط‬ ، ‫الومطز‬ ‫الوبء‬ ) ‫هزجهب‬ ‫حن‬ ‫الخً‬ ‫األسٌبى‬ ‫حجز‬ ‫هبدة‬ ‫هي‬ ‫ًىعٍي‬ ‫هع‬ (plaster and stone) . ‫النتائج‬ : ‫الوسحىق‬ ‫إلى‬ ‫الوبء‬ ‫ًسبت‬ ‫فً‬ ‫هعٌىي‬ ‫اخخالف‬ ‫وجىد‬ ‫الٌخبئج‬ ‫أظهزث‬ ‫الذراست‬ ‫فً‬ ‫الوسخخذهت‬ ‫الوٍبٍ‬ ‫هي‬ ‫الوخخلفت‬ ‫األًىاع‬ ‫هع‬ ‫هزجهب‬ ‫عٌذ‬ ‫األسٌبى‬ ‫حجز‬ ‫لوبدة‬ . ‫االستنتاجات‬ : ‫الخً‬ ‫الوبء‬ ‫كوٍت‬ ‫إى‬ ‫الٌخبئج‬ ‫بٌٍج‬ ‫الوزج‬ ‫فً‬ ‫الوسخخذم‬ ‫الوبء‬ ‫ًىع‬ ‫حسب‬ ‫حخخلف‬ ‫الجبس‬ ‫هبدة‬ ‫هشخمبث‬ ‫ححخبجهب‬ . ‫الجبس‬ ‫هشخمبث‬ ‫إلٍهب‬ ‫ححخبج‬ ‫هبء‬ ‫ًسبت‬ ‫الل‬ ‫الٌخبئج‬ ‫أظهزث‬ ‫كوب‬ ‫المىام‬ ‫رلٍك‬ ‫الوالط‬ ‫اسخخذام‬ ‫عٌذ‬ ‫هً‬ .ABSTRACT Aims: To evaluate the effect of different water types on the water powder ratio of dental gypsum products. Materials and Methods: In this study five types of water (distilled, tab, slurry, de-ionized and well water) were used to be mixed with two types of dental gypsum products (plaster and stone). Results: Results showed a statistically significant difference at p ≤ 0.05 in water powder ratio of gypsum products when mixed with different types of water that used in this study . Conclusions: Water requirement of gypsum product varies in respect to the type of water used to be mixed with. The most pronounce decrease in water requirement of dental gypsum products was achieved with slurry water. Key words: types of water, water powder ratio and gypsum product.Taqa AA. Mohammed NZ. Alomari AW. The Effect of Different Water Types on The Water Powder

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Crystallization of calcium sulfate dihydrate under simulated conditions of phosphoric acid production in the presence of aluminum and magnesium ions

Cited by 98 publications

References 9 publications

The effect of magnesium on partial sulphate removal from mine water as gypsum

The effect of magnesium on partial sulphate removal from mine water as gypsum

Influence of citric acid on calcium sulfate dihydrate crystallization in aqueous media

The Effect of Different Water Types on The Water Powder Ratio of Dental Gypsum Products

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