Skip to main navigation menu Skip to main content Skip to site footer
Page Header Logo

Research article

Vol 6 No 1 (2012): Volume 6, Number 1, 2012

Kinetika pelarutan silika amorf dari lumpur panas bumi Dieng

DOI
https://doi.org/10.22146/jrekpros.2450
Submitted
November 14, 2023
Published
June 30, 2012

Abstract

Dieng’s geothermal power plant generates not only energy but also wastes as sludge that contains around 50% silica in an amorphous state. The waste has a great potential to be used as a source of micro-amorphous silica synthesis to fulfill industrial needs. This research aimed to study the dissolution kinetics of amorphous silica. In the present work, the alkali – solubilization process by means of the dissolution of amorphous silica in an agitated flask was studied by varying process temperatures (50 – 90 °C), stirring speed (150 – 450 rpm), Na/Si molar ratio (2 – 3), and silica particle size (0,0069 – 0,01975 cm). Experimental results showed that the rate of geothermal silica dissolution increased with temperature and stirring speed. Meanwhile, Na/Si molar ratios and silica particle sizes showed no significant influence on the dissolution process. Calculation results indicated that the dissolution process involved a solid – liquid reaction that occured at the solid surface.

References

  1. Berger, G., Cadore, E., Schoot, J., dan Dove, P. M., 1994. Dissolution rate of quartz in lead and sodium electrolyte solutions between 25 and 300 oC: Effect of the nature of surface complexes and reaction affinity, Geochim. Cosmochim. Acta., 58(2), 541-551.
  2. Cussler, E. L., 2000. Diffusion : Mass transfer in fluid systems, Cambridge University Press., NY., USA.
  3. Eaton, A. D., Clescery, L. S., Rice, E. W., dan Greenberg, A.E., Editors, 2005. Standard Methods for Examination of Water and Wastewater, 21st Ed., Centenial edition, Port City, Baltimore, Maryland.
  4. Govett, G. J. S., 1960. Critical factors in the calorimetric determination of silica, Anal. Chim. Acta., 25, 69-80.
  5. House, W., dan Orr, D. R., 1992. Investigation of the pH dependence of the Kinetic of Quartz dissolution at 25 oC., Chem. Soc. Faraday Trans., 88(2), 233-241.
  6. Icenhower, J. P., dan Dove, P. M., 2000. The dissolution kinetics of amorphous silica into sodium chloride solutions: effect of temperature and ionic strength, Geochim. Cosmochim. Acta, 64(24), 4193-4203.
  7. Iler, R. K., 1979. The Chemistry of Silica, John Wiley & Sons, Inc., New York.
  8. Joley, J. G., 1961, The kinetics of the reaction of silica with group I of hydroxide, Can. J. Chem., 39, 200- 205.
  9. Kalapathy, U., Proctor, A., dan Schultz, J., 2000. A simple method for production of pure silica from rice hull ash, Biores. Technol., 73, 257-262.
  10. Kirk, R. E., dan Othmer, D. F., 1998. Encyclopedia of Chemical Technology, Vol. 21., 4th ed., John Wiley and Sons Inc., New York.
  11. Niibori, Y., Kunita, M., Tochiyama, O., dan Chida, T., 2000. Dissolution rates of amorphous silica in highly alkaline solution, .J.Nucl.Sci.Technol., 37(4), 349-357.
  12. Okunev, A. G., Shaurman, S. A., Danilyuk, A. F., Aristov, Y. I., Bergeret, G., dan Renouprez, A., 1999. Kinetics of the SiO2 aerogel dissolution in aqueous NaOH solutions: experiment and model, J. Non-Cryst. Solids, 260, 21-30.
  13. Okutani, T., 2009. Utilization of silica in rice hull as raw materials for silicon semiconductors, J. Met. Mater. Min., Vol. 19(2), 51-59.
  14. Rimstidj, J. D., dan Barnes, H. L., 1980. The kinetics of silica – water reaction, Geochim. Cosmochim. Acta., 44, 1683-1699.
  15. Sun. L., dan Gong, K., 2001. Silicon-based materials from rice husks and their applications, Ind. Eng. Chem. Res., 40, 5861-5877.
  16. Worley, W. G., 1994. Dissolution Kinetics and Mechanism in Quartz-and-Granite-Water Systems, Ph.D. disertation. Massachusetts Institute of Technology, Cambridge, MA.
  17. Xiao, Y., dan Lasaga, A. C., 1996. Ab initio quantum mechanical studies of the kinetics and mechanism of silicates dissolution: OHcatalysis, Geochim. Cosmochim. Acta., 60(13), 2283-2295.
  18. Zaky, R. R., Hessien, M. M., El-Midany, A. A., Khedr, M. H., Abdel-Aal, E. A., dan El-Barawy, K.A., 2008. Preparation of silica nanoparticles from semi-burned rice straw ash, Powder Technol., 185, 31-35.