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IJSTR >> Volume 5 - Issue 5, May 2016 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Textural And Mineralogical Studies Of Two Tunisian Sedimentary Phosphates Or Carbonated Fluorapatite Used In The Process Of Production Of Phosphoric Acid

[Full Text]

 

AUTHOR(S)

Ahmed Chaabouni, Chaker Chtara, Ange Nzihou, Hafed El Feki

 

KEYWORDS

Carbonated fluorapatite, Infra Red Spectroscopy, Physico-chemical characterization, Physisorption, Reactivity of the ore, SEM, Tunisian sedimentary phosphate, X-ray diffraction.

 

ABSTRACT

Tunisian phosphate is a sedimentary rock and is the second major expense in producing phosphoric acid which is used mainly in fertilizer field. Phosphate is a mesoporous solid and has very large specific surface areas which often lead to greater activity due to increased dispersion of the active sites. The reaction between phosphate rocks and acids is essentially a surface reaction. Within the framework of valorization of Tunisian natural phosphate which is a carbonate fluorapatite or francolite and to establish the relations between the reactivity of phosphate rock and their physico-chemical properties.Two Tunisian's deposits of phosphate were selected. Several techniques were used such as the SEM, physisorption for textural study, X-ray diffraction technique and Infra Red Spectroscopy for the mineralogical study. From the textural study, we note that the two samples of phosphate have a mesoporous texture and all phosphate rocks contain many impurities. From the mineralogical study we note that the two main constituents of sedimentary phosphate rocks are apatite and calcium carbonate. The results obtained show a slight difference in physico-chemical properties between the two types of sedimentary phosphates and the dependence between the chemical reactivity and the structure of these phosphates.

 

REFERENCES

[1] A. Mechay, H. EL FEKI, F. Schoenstein, F. Tétard, and N. Jouini, “Effect of spark plasma sintering process on the microstructure and mechanical properties of Nano crystalline hydroxyapatite ceramics prepared by hydrolysis in polyol medium,” International Journal of Advanced in Chemistry, vol. 2, pp. 80-84, 2014, doi: 10.14419/ijac.v2i2.2393

[2] A.V. Slack, “Phosphoric Acid,” Fertilizer Science and Technology Series, vol. 1, 1968

[3] J. R. Lehr, and C. McClellan, “Phosphate Rocks: Important Factors in Their Economic and Technical Evaluation,” In CENTO Symposium on Mining and Beneficiation of Fertilizer Minerals, Istanbul 19-24 November 1973. Central Treaty of Organization, Ankara, pp. 142-194, 1973

[4] A. CHAABOUNI, C. CHTARA, A. NZIHOU, and H. EL FEKI, “Study the Nature and the Effects of the Impurities of Phosphate Rock in the Plants of Production of Phosphoric Acid,” Journal of Advances in Chemistry, vol. 7, no. 2, pp. 1296-1299, Jan. 2014

[5] S. Van Der Sluis, G.J. Witkamp, and G.M. Van Rosmalen, “The crystallization of calcium sulfate in concentrated phosphoric acid,” J. Cryst. Growth, vol. 79, pp. 620-629, 1986

[6] P. Becker, “Phosphate and Phosphoric Acid,” Fertilizer Science and Technology Series, Marcel Decker, New York, vol. 3, 1983

[7] A. CHAABOUNI, C. CHTARA, A. NZIHOU, and H. EL FEKI, “Kinetic Study of the Dissolution of Tunisian Natural Phosphate or Francolite in Industrial Phosphoric Acid,” Journal of Advances in Chemistry, vol. 6, no. 1, pp. 908-916, Dec. 2013

[8] S. Van Der Sluis, Y. Meszaros, J.A. Wesselingh, and G.M. Van Rosmalen, Proceedings of the fertilizer Society of London, 1986

[9] S.M. Janikowski, N. Robinson, and W.F. Sheldrick, “Insoluble Phosphate Losses in Phosphoric Acid Manufacture by the Wet Process,” Theory and Experimental Techniques. In: 18th Meeting of the Fertilizer Society, London, Feb. 1964

[10] S. Brunauer, PH. Emmett, and E. Teller, “Brunauer–Emmett–Teller (BET) theory,“ J. Am. Chem. Society, vol. 60, pp. 309, 1938

[11] R.N. Hannah, and J.S. Swinehart, “Experiments in Techniques of Infrared Spectroscopy,” Perkin-Elmer Norwalk, CT, 1974

[12] I.U.P.A.C., “Reporting Physisorption Data for Gas/Solid Systems with Special Reference to the Determination of Surface Area and Porosity,” Pure Appl. Chem., vol. 4, pp. 603-619, 1985

[13] S.M. Janikowski, N. Robinson, and W.F, Sheldrick, “Insoluble phosphate losses in phosphoric acid manufacture by the wet process: theory and experimental techniques,” Fertilizer Society, London, no. 81, 1964

[14] Caro, J. H.; Freeman, H. P. Physical Structure of Fertilizer Materials, Pore Structure of Phosphate Rock and Triple Superphosphate. J. Agr. Food Chem, vol. 9, no. 3, pp. 182-186, May. 1961, doi: 10.1021/jf60115a003

[15] W.L. Hill, J.H. Caro, and G.A. Wieczorek, “Phosphate Evaluation, Surface Area of Natural and Processed Phosphates,” J. Agr. Food Chemistry, vol. 2, pp. 1273-1277, 1954, doi: 10.1021/jf60045a003

[16] Wm.H. Waggaman, “PHSPHORIC ACID, PHOSPHATES AND PHOSPHATIC FERTILIZERS,” SECOND EDITION, Second Printing, pp. 181, Oct. 1953

[17] J.L. Mero, “Minerals of the Sea,” Elsevier, Amsterdam, 1965

[18] H. EL FEKI, C. Rey, and M. Vignoles, “Carbonate ions in apatite, Infra-red investigations in the ν4 CO3 domain,” Calcif. Tissue Int., vol. 49, pp. 269-274. 1991

[19] H. EL FEKI, I. KHATTECH, M. JEMAL, and C. Rey, “Thermal decomposition of sodic carbonate-hydroyapatites,” Thermochimica Acta, vol. 237, pp. 99-110, 1994

[20] P. Regnier, Ae. Lasaga, R.A. Berner, OH. Han, and K.W. Zilm, “Mechanism of CO32- substitution in carbonate-fluorapatite: Evidence from FTIR spectroscopy, 13C NMR, and quantum mechanical calculations,” American mineralogist, vol. 79, pp. 809-818, 1994

[21] G. Xu, I.A. Aksay, and J.T. Groves, “Continuous crystalline dahllite thin films via inhibited template assembly,” J. Am. Chem. Soc., vol. 123, pp. 2196-2203, 2001

[22] Y. Nathan, “Mechanism of CO32- substitution in carbonate-fluorapatite: Evidence from FTIR spectroscopy, 13C NMR, and quantum mechanical calculations-Discussions,” American mineralogist, vol. 81, pp. 513-514, 1996

[23] R.A. Young, Coll. Int. CNRS, Paris. No. 230, 1973

[24] J.C. Trombe, “Contribution to the study of the decomposition and reactivity of certain hydroxyapatite and carbonate-hydroxyapatite,” Ann. Chem., vol. 8, pp. 251-269, 1973

[25] A. CHAABOUNI, C. CHTARA, A. NZIHOU, and H. EL FEKI, “Study the effects of calcinations and evolution of crystallographic parameters of two Tunisian natural phosphates,” Int. Journal of Advanced in Chemistry, vol. 2, pp. 24-26, Jan. 2014, doi: 10.14419/ijac.v2i1.1664

[26] J. C. Elliott, “Structure and Chemistry of the Apatites and Other Calcium Orthophosphates,” Elsevier, Amsterdam, 1994

[27] K.I. Adlen, and I. Lindgvist, “X-ray studies for some Apatites,” Journal of Inorganic and General Chemistry, Zeitschrift für anorganische und allgemeine Chemie, vol. 328, pp. 219-222, 2004