Development of a Spray Dryer Device to Produce Ammonium Niobium-Oxalate Precursor

Abstract:

The main purpose of this paper is to present a spray dryer device developed to synthesize ammonium niobium-oxalate precursor powder with controlled grain size. The dryer device is manufactured using stainless steel 304 and measures 0,48m in outside diameter and 1,9m in height. The spray dryer has a cylindrical shape assembled on a conical base. The central chamber is heated by three 4 KW resistances and is equipped with serpentine coil heaters placed around its main body. This configuration guarantees that the air is at the same temperature of the chamber walls and the adherence of the powder particles on the wall is prevented. The precursor solution is atomized on the air stream downwards from the top to the bottom, at low rates. Powder particles are collected on a 0,4m diameter horizontal plate placed at the bottom portion of the dryer and the wet air is released from the chamber by the opening located under the collecting plate. The synthesis of the niobium oxalate precursor and the results of the decomposition process are described.

• Periodical: Materials Science Forum (Volumes 498-499)
• Pages: 3-8
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.498-499.3
• Online since: November 2005
• Authors: U.C. Oliveira Filho, A.C. Araújo, E.L. Oliveira, C.P. Souza
• Keywords: Ammonium Niobium Oxalate, Precursor, Spray Drying

References

[1] - Medeiros F. F. P, Silva A.G. P, Souza C.P., A low temperature synthesized NbC as grain growth Inhibitor for WC-Co Composites, Materials Science and Engineering A, 293, (2000), 242-246.

DOI: 10.1016/s0921-5093(00)00993-x

[2] - Ciaravino C, Medeiros F.F. P, Souza C. P, Satre P, Roubin M, Gomes U. Elaboration of mixed tantalum-niobium carbides elaborated from oxalic complex (NH4)(Ta1-xNbx)O(C2O4). nH2O from tantalite mineral (Fe, Mn)(Ta1xNbx)2O6. 14th International Congress of Chemical and Process Engineering 27-31 august, (2000).

[3] - Clar, E.; Doctorate Thesis: Obtention et propriétés de carbures métalliques simples et mixtes à grain fin, Faculty of Sciences at the Lyon University, (1964), Lyon, France.

[4] - Toth, L. E. , Transition Metal Carbides and Nitrides - A Series of monographs. Academic Press, Volume II, (1971), New York and London.

[5] - Storms, E. K., Refractory Carbides - A Series of monographs. Academic Press, Volume II, (1971), New York and London.

[6] - Cotton F. A; Wilkinson, G. (1982) Química Inorgânica. Livros Técnicos e Científicos.

[7] - Krishnamurty K. V.; Harris G. M. (1962), The Chemistry of Metal Oxalato Complexes.

[8] - Kergoat R., Guerchais J. E., Oxalato Complexes du Molybdéne (V) et (du Niobium (V). Z. anorg. Allg. Chem. 416, (1975), 174-180.

DOI: 10.1002/zaac.19754160209

[9] - Mathern, R. Weiss , Rohmer R. , Chem. Comm., (1969), 70.

[10] - Marta L; Zaharescu M.; Macarovici CG. , Thermal and Structural Investigation of Some Oxalato-Niobium Complexes. 3. Strontium Tris(oxalato)oxoniobate. Journal of Thermal Analysis, 26, (1983), 87-94.

DOI: 10.1007/bf01914092

[11] - Marta, L.; Zaharescu, M.; Macarovici, CG.; Revue Roumains de Chimie, 24, 8, (1979).