Semi-batch crystallization experiments of CaSO, -1/2 H,O (HH) wcre performed in concentratcd phosphoric acid at various H,SO, contents in the absence and presence of additives. The influence of the operating conditions and additives on the cadmium and phosphate incorporation in the HH lattice were
Agglomeration kinetics of calcium sulphate hemihydrate crystals in sulpho-phosphoric solutions
β Scribed by M. El Moussaouiti; R. Boistelle; A. Bouhaouss; J.P. Klein
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 421 KB
- Volume
- 169
- Category
- Article
- ISSN
- 0022-0248
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π SIMILAR VOLUMES
The hydration of calcium sulphate hemihydrate to produce calcium sulphate dihydrate (gypsum plaster) has been the subject of several kinetic models, two of the most notable of which were proposed in a series of conflicting papers by Ridge and Schiller. Evidence was put forward in support of both the
The effect of temperature (20-100 "C) and concentration of H,SO, etching solutions on the etching behaviour of { 111) faces of calcium fluoride crystals is investigated. Whisker growth of calcium sulphate is observed. Temperature of the etchant also has an effect on their formation. The kinetics of
Hand has used Avrami's equation to generate 'theoretical hydration curves' for calcium sulphate hemihydrate, and then has used 'data' derived from them to test equations due to Ridge (1,2) and Schiller (3). But Avrami's equation has no established validity in the field and is, in fact, irrelevant. T