Published

2010-05-01

Sodium aluminates obtained from the (NO3)3 • 9H2O - NaOH system using the controlled precipitation method

Aluminatos de sodio obtenidos del sistema Al(NO3)3 • 9H2O - NaOH a través del método de precipitación controlada

DOI:

https://doi.org/10.15446/ing.investig.v30n2.15726

Keywords:

sodium aluminate, synthesis, controlled precipitation method (en)
aluminato de sodio, síntesis, precipitación controlada (es)

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Authors

  • Christhy Vanessa Ruiz Madroñero Universidad del Cauca
  • Jorge Enrique Rodríguez Páez Universidad del Cauca

Sodium aluminate, NaAlO2• xH2O, is an important commercial chemical used in water treatment, as a source of aluminium in the preparation of zeolites and other catalytic materials and as an additive in paper manufacturing. Sodium aluminates were synthesised in this work by using the Al(NO3)3 • 9H2O- NaOH system's controlled precipitation method. Using the controlled precipitation method enabled identifying the process's different stages from potentiometric titration of Al(NO3)3 • 9H2O dissolved in water and using NaOH as precipitating agent to ensure control and reproducibility and also identify final product characteristics. Powders were characterised by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and gravimetric and differential thermal analysis (GDTA). The results indicated that NaAlO2 crystallised well at 1,000°C (obtained as the main crystalline sodium aluminate phase) and that β-alumina treatment began to form at 1,500°C.

Los aluminatos de sodio, NaAlO2 • xH2O, son materiales que se utilizan en el tratamiento del agua, como fuente de aluminio en la preparación de zeolitas y otros materiales catalíticos como aditivo en la manufactura del papel. En este trabajo se presentan los resultados obtenidos al sintetizar aluminatos de sodio por el método de precipitación controlada utilizando como precursor el Al(NO3)3 • 9H2O. El uso del método de precipitación controlada permitió, a partir de la valoración potenciométrica del Al(NO3)3 • 9H2O disuelto en agua y empleando como precipitante NaOH, determinar las diferentes etapas del proceso para garantizar el control y su reproducibilidad, así como las características del producto final. También se presenta una propuesta sobre el mecanismo de formación de las partículas en el seno de la solución, así como los resultados del efecto del tratamiento térmico sobre las fases cristalinas presentes en el sólido. La caracterización de los polvos obtenidos se realizó utilizando espectroscopia infrarroja (FTIR), difracción de rayos X (DRX) y análisis térmico (ATD/TG). Los resultados indican que a 1.000 °C se obtiene como principal fase cristalina aluminato de sodio, NaAlO2, bien cristalizado, y que para tratamientos a 1.500 °C la β-alúmina comienza a formarse.

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References

Andersen, M. D., Jakobsen, H. J., Skibsted, J., Characterization of white Portland cement hydration and the C-S-H structure in the presence of sodium aluminate by 27Al y 29Si MAS NMR spectroscopy., Cement and Concret Research, Vol. 34, 2004, pp. 857-868.

Arai, Y., Chemistry of powder production., 1a ed., London, Chapman & Hall, 1996, pp. 281.

Cobo, J., Estudio de la síntesis de alúmina por el método de precipitación controlada (MCP)., Trabajo de Grado presentado a la Universidad del Cauca, para optar al título de Química, 2005.

Fernández, J. F., Vaquerizo. J., (ed), Introducción a la Electrocerámica., 1ª ed, Madrid, Fundación Rogelio Segovia para el Desarrollo de las Telecomunicaciones., 2003.

Ganguli, D., Chatterjee, M., Ceramic powder preparation: a handbook., Boston / Dordrecht / London, Kluwers Academic Publishers, 1997.

Georgakis, C., On the use of extensive variables in process dynamics and control., Chem. Eng. Sci., Vol. 41, 1986, pp.1471-1484.

Hung, C., Chen, Y., ward J.D., Yu, C., Dynamics of processes with recycle: Multifeed ternary systems., Ind. Eng. Res., Vol. 45, 2006, pp. 8864-8677.

Kaduk, J. A., Pei, S., The crystal structure of hydrated sodium aluminate NaAlO2 • 5/4 H2O and its dehydration product., Journal Solid State Chemistry, Vol 115,1995, pp. 126-139.

Londoño, F., Síntesis y caracterización de β-Alúmina., Trabajo de Grado presentado a la Universidad del Cauca, para optar al título de Ingeniero Físico, 2004.

Lota, J. S., Bensted, J., Pratt, P. L., Effect of sodium aluminate on class G oil well cement hydration at low and ambient temperatures., Proceedings of the 10 th International Congress on the Chemistry of cement, Vol. 3, 1997.

Luyben, W. L., Snowball effects in reactor/separator processes with recycle., Ind. Eng. Chem. Res., Vol. 33, 1994, pp. 299-305.

Misra, C., Industrial alúmina chemicals, ACS monograph., American Chemical Society, Vol. 184, and references therein, 1986, pp. 151-155.

Monroy-Loperena, R., Solar, R., Alvarez-Ramirez, J., Balanced control scheme for reactor/separator processes with material recycle., Ind. Eng. Chem. Res., Vol. 43, 2004, pp. 1853-1862.

Nakamoto, K., Infrared Spectra of Inorganic and Coordination Compounds., New York- London, John Wiley & Inc., 1962.

Ring, T. A., Fundamentals of ceramic powder processing and synthesis., New York, Academic Press., 1996.

Ruiz, V., Síntesis de β-Alúmina por rutas químicas y estudio de su conformado Cerámico., Trabajo de Grado presentado a la Universidad del Cauca, para optar al título de Ingeniera Física, 2008.

Tyreus, B. D., Luyben, W. L., Dynamics and control of recycle systems. 4. Ternary systems with one and two recycle streams., Ind. Eng. Chem. Res., 32, 1993, pp.1154-1162.

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Copyright (c) 2010 Christhy Vanessa Ruiz Madroñero, Jorge Enrique Rodríguez Páez

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