The effect of aluminium fluoride on the formation of calcium sulfate hydrates

Hydrometallurgy

Volumn 41, Issue 2-3, 1996, Pages 171-186

  Martynowicz, Emile T M J ^a   Witkamp, Geert Jan ^a   Van Rosmalen, Gerda M ^a  

^a DELFT UNIVERSITY OF TECHNOLOGY   (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

AGGLOMERATION; CALCIUM; CHEMICAL MODIFICATION; COMPOSITION EFFECTS; CRYSTALLIZATION; CRYSTALS; FLUORINE COMPOUNDS; PHOSPHORIC ACID; SOLUBILITY; SULFURIC ACID;

ALUMINIUM FLUORIDE; CALCIUM SULFATE HYDRATES; CRYSTAL HABIT; FLUORAPATITE ROCK; HYDROGEN FLUORIDE; PHOSPHORIC ACID PROCESSING;

HYDRATES;

EID: 0030173625     PISSN: 0304386X     EISSN: None     Source Type: Journal    
DOI: 10.1016/0304-386x(95)00066-p     Document Type: Article

References (13)

1. Meijer, J.A.M. and Van Rosmalen, G.M., Solubilities and supersaturations of calcium sulfate and its hydrates in sea water. Desalination, 51 (1984): 255-305.
2. Marshall, W.L. and Slusher, R.J., Aqueous systems at high temperature. Solubility to 200°C of calcium sulfate and its hydrates in sea water and saline water concentrates, and temperature-concentration limits. J. Chem. Eng. Data, 13 (1968): 83-93.
3. Slack, V., Phosphoric Acid. Marcel Dekker, New York (1968), pp. 331-342.
4. Witkamp, G.J. and Van Rosmalen, G.M., Incorporation of cadmium and aluminium fluoride in calcium sulfate. In: J. Nyvlt and S. Zacek (Editors), Industrial Crystallization, 87. Elsevier, Amsterdam (1989), pp. 265-270.
5. Jones, A.G., Agglomeration during crystallization and precipitation from solution. In: M. Cross and R. Oliver (Editors), Proc. 5th. Int. Symp. Agglomerates (Rugby, 1989), pp. 131-143.
6. Witkamp, G.J. and Van Rosmalen, G.M., Incorporation of foreign ions in calcium sulfate. In: M. Astruc and J.N. Lester (Editors), Heavy Metals in the Hydrological Cycle. Selper, London (1988), pp. 101-112.
7. Taperova, A.A., Physical chemical analysis of the treatment of phosphates with sulfuric acid. J. Appl. Chem. (USSR), 13 (1940): 643-651.
8. 5 phosphoric acid solutions at 80, 90, 100 and 110°C: Correlations with water concentration. J. Chem. Eng. Data, 36 (1991): 77-80.
9. Martynowicz, E.T.M.J., Impurity uptake in calcium sulfate during phosphoric acid processing. PhD Thesis, Delft Univ. Technology (1994).
10. Gilbert, R.L., Crystallization of gypsum in wet process phosphoric acid. I EC Proc. Des. Dev., 6 (1965): 371-374.
11. Van der Sluis, S., Witkamp G.J. and Van Rosmalen, G.M., Crystallization of calcium sulfate in concentrated phosphoric acid. J. Crystal Growth, 79 (1986): 620-629.
12. Witkamp, G.J., Dynamic simulation of crystallization processes with the class method. In prep.
13. Weijnen, M.P.C. and Van Rosmalen, G.M., The influence of various polyelectrolytes on the precipitation of gypsum. Desalination, 54 (1985): 239-261.