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calcium sulphate hemihydrate hydration leading :

Calcium sulphate hemihydrate hydration leading to

2007-3-1  Most of the researchers agree that the hydration of hemihydrate leading to the formation of calcium sulphate dihydrate occurs through a solution mechanism , , , , , , i.e., the hemihydrate first dissolves and then the dihydrate precipitates from the aqueous solution because it is less soluble than the hemihydrate .

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Calcium sulphate hemihydrate hydration leading to

The hydration of calcium sulphate hemihydrate (CaSO 4 0.5H 2 O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO 4 2H 2 O) has been the subject of several investigations over a long period and a vast amount of data is widely distributed throughout in the literature.

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Calcium Sulphate Hemihydrate Hydration Leading to

2007-3-1  The hydration of calcium sulphate hemihydrate (CaSO40.5H2O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO42H2O) has been the

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Calcium sulphate hemihydrate hydration leading to

Abstract The hydration of calcium sulphate hemihydrate (CaSO 4 0.5H 2 O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO 4 2H 2 O) has been the subject of several investigations over a long period and a vast amount of data is widely distributed throughout in the literature. In this review article an overall picture of the subject is presented.

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Calcium sulphate hemihydrate hydration leading to

The hydration of calcium sulphate hemihydrate (CaSO 4 0.5H 2 O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO 4 2H 2 O) has been the subject of several investigations over a long period and a vast amount of data is widely distributed throughout in the literature. In this review article an overall picture of the ...

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Hydration of Calcium Sulphate Hemihydrate Nature

1965-3-1  IN Nature of October 3, 1964, M. J. Ridge discusses the hydration of calcium sulphate hemihydrate on which he modifies his previous views. The mechanism proposed is

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Singh, N.B. and Middendorf, B. (2007) Calcium Sulfate ...

Singh, N.B. and Middendorf, B. (2007) Calcium Sulfate Hemihydrate Hydration Leading to Gypsum Crystallization. Progress in Crystal Growth and Characterization of Materials, 53, 57-77.

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Accelerating the hydration of calcium sulfate

High energy mixing of calcium sulfate hemihydrate/water slurries provides a means to accelerate the hydration leading to gypsum formation. Additional benefits associated with high energy mixing include enhanced strength of the resulting gypsum casts. In order to exploit the advantages of high energy mixing, an understanding of the relationship between mixing energy and set acceleration is needed.

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Hydration of Calcium Sulphate Hemihydrate -

1965-3-1  The differential equation, the solution of which forms my complete equation for the hydration of calcium sulphate hemihydrate, was derived from one developed earlier to account for the self-acceleration of the reaction 1-6 by the inclusion of a term allowing for processes leading to the decay of the rate. Contrary to Schiller's statement (preceding communication), I have not modified my views,

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Hydration of Calcium Sulphate Hemihydrate Nature

IN Nature of October 3, 1964, M. J. Ridge discusses the hydration of calcium sulphate hemihydrate on which he modifies his previous views. The mechanism proposed is somewhat similar to that put ...

Read More
Calcium sulphate hemihydrate hydration leading to

The hydration of calcium sulphate hemihydrate (CaSO 4 0.5H 2 O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO 4 2H 2 O) has been the subject of several investigations over a long period and a vast amount of data is widely distributed throughout in the literature. In this review article an overall picture of the ...

Read More
Accelerating the hydration of calcium sulfate

High energy mixing of calcium sulfate hemihydrate/water slurries provides a means to accelerate the hydration leading to gypsum formation. Additional benefits associated with high energy mixing include enhanced strength of the resulting gypsum casts. In order to exploit the advantages of high energy mixing, an understanding of the relationship between mixing energy and set acceleration is needed.

Read More
Singh, N.B. and Middendorf, B. (2007) Calcium

Singh, N.B. and Middendorf, B. (2007) Calcium Sulphate Hemihydrate Hydration Leading to Gypsum Crystallization. Progress in Crystal Growth and Characterization of Materials, 53, 57-77.

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Hydration kinetics of calcium sulphate hemihydrate ...

2018-7-7  Hemihydrate sulphate (gypsum) hydration involves a set of coupled chemical and physical processes [9,10]: 1. Dissolution of hemihydrate involves detachment of molecules from a solid surface in contact with water CaSO 4∙0.5H 2 O (s) CaSO 4∙0.5H 2 O (aq) 2.

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Hydration of Calcium Sulphate Hemihydrate

IN Nature of October 3, 1964, M. J. Ridge discusses the hydration of calcium sulphate hemihydrate on which he modifies his previous views. The mechanism proposed is somewhat similar to that put forward by me at the fourth international symposium on the “Reactivity of Solids”1 and published in greater detail in subsequent communications2–4.

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Hydration reactions and microstructural

The hydration of calcium sulphate hemihydrate was investigated under several conditions of temperature, pH, water/solid ratio and the addition of citric or malic acid. ... leading to the complete ...

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水化时间和温度对半水硫酸钙晶须水化过程的影响

2017-3-7  SINGH N B, MIDDENDORF B. Calcium sulphate hemihydrate hydration leading to gypsum crystallization[J]. Progress in Crystal Growth and Characterization of Materials, 2007, 53(1):57-77. [21] MAO Xiulong, SONG Xingfu, LU Guimin, et al.

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THE CRYSTAL FORMS OF CALCIUM SULPHATE L. S.

2007-8-30  The hemihydrate was first discovered by Millon (1). Its prepara-tion and properties were extensivi:ly investigated by Le Chatelier (2). Both of these investigators found that the hemihydrate lost its water of hydration completely on heating, but Potilitzin (3) was the first to announce that the anhydrous calcium sulphate pre-

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半水型硫酸钙晶须的不饱和低温制备及生长机理分析-西安建筑 ...

[5] SINGH N B, MIDDENDOR B. Calcium sulphate hemihydrate hydration leading to gypsum crystallization[J]. Progress in Crystal Growth and Characterization of Materials, 2007, 53(1): 57-77. [6] BAO Z J, LI J L, WANG W W. Solubility of calcium sulfate in

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The Role and Implications of Bassanite as a Stable ...

2012-4-6  Calcium sulfate minerals such as gypsum play important roles in natural and industrial processes, but their precipitation mechanisms remain largely unexplored. We used time-resolved sample quenching and high-resolution microscopy to demonstrate that gypsum forms via a three-stage process: (i) homogeneous precipitation of nanocrystalline hemihydrate bassanite below its predicted solubility,

Read More
Calcium sulphate hemihydrate hydration leading to

The hydration of calcium sulphate hemihydrate (CaSO 4 0.5H 2 O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO 4 2H 2 O) has been the subject of several investigations over a long period and a vast amount of data is widely distributed throughout in the literature. In this review article an overall picture of the ...

Read More
Hydration kinetics of calcium sulphate hemihydrate ...

2018-7-7  Hemihydrate sulphate (gypsum) hydration involves a set of coupled chemical and physical processes [9,10]: 1. Dissolution of hemihydrate involves detachment of molecules from a solid surface in contact with water CaSO 4∙0.5H 2 O (s) CaSO 4∙0.5H 2 O (aq) 2.

Read More
Hydration reactions and microstructural

The hydration of calcium sulphate hemihydrate was investigated under several conditions of temperature, pH, water/solid ratio and the addition of citric or malic acid. ... leading to the complete ...

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calcium sulphate是什么意思_calcium sulphate怎么读 ...

Calcium sulphate hemihydrate hydration leading to gypsum crystallization The use of calcium sulfate in the treatment of benign bone lesions. A preliminary report.

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Effects of metal ions on the morphology of calcium

Preparation of α-calcium sulfate hemihydrate from FGD gypsum in K, Mg-containing concentrated CaCl2 solution under mild conditions. Fuel, 2009, 88(7): 1286–1293: 29: Singh N B, Middendorf B. Calcium sulphate hemihydrate hydration leading to gypsum crystallization.

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Preparation of α-Calcium Sulfate Hemihydrate from ...

With the growing demand of phosphoric fertilizer a great quantity of phosphogypsum (PG) was produced in China.To utilization of PG in an energy-saving way,the phase transition of PG from DH to α-HH in CaCl2 solution under atmospheric pressure was conducted, the reaction time of phase transition was significantly shortened by higher reaction temperature and CaCl2 content of the mixtures.

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Effect of humidity on calcium sulphate hemihydrate ...

1990-6-1  The conversion of calcium sulphate hemihydrate powders to dihydrate by reaction with atmospheric water vapour has been re‐examined gravimetrically. Storage is usually said to be safe at less than ‘70 per cent RH’, but this is shown to be an inadequate criterion (water vapour pressure being more useful in the context) and based on an inappropriate experiment. At 23°C, greater than about ...

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THE CRYSTAL FORMS OF CALCIUM SULPHATE L. S.

2007-8-30  The hemihydrate was first discovered by Millon (1). Its prepara-tion and properties were extensivi:ly investigated by Le Chatelier (2). Both of these investigators found that the hemihydrate lost its water of hydration completely on heating, but Potilitzin (3) was the first to announce that the anhydrous calcium sulphate pre-

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可注射性硫酸钙骨水泥的生物力学研究

2020-3-30  关键词: 硫酸钙 抗压强度 生物力学 Abstract: Objective To investigate the effect of different plasticizers on the compressive strength of injectable calcium sulfate cement (ICSC).Methods Hydroxymethylcellulose (CMC), methylcellulose (MC), hyaluronic acid (HA), stearic acid (SA) and self-made hemihydrate calcium sulfate were used to mix them, and the compressive strength of the ...

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The Role and Implications of Bassanite as a Stable ...

2012-4-6  Calcium sulfate minerals such as gypsum play important roles in natural and industrial processes, but their precipitation mechanisms remain largely unexplored. We used time-resolved sample quenching and high-resolution microscopy to demonstrate that gypsum forms via a three-stage process: (i) homogeneous precipitation of nanocrystalline hemihydrate bassanite below its predicted solubility,

Read More