Effect of ultrasonic waves on crystallization from a supersaturated solution of alum
The effect of ultrasonic waves on the particle size and distribution of precipitated crystals from a slowly cooled supersaturated solution of ammonium aluminium sulphate hydrate was investigated. It was found that ultrasonic irradiation greatly promoted the homogeneity in particle sizes of the crystals precipitated. Average particle sizes of both the mechanical stirred and the ultrasonically treated samples did not change much if the initial solute concentration was beyond the saturation solubility of the solution. The higher acoustic intensity of the higher frequency ultrasonic transducer resulted in a larger average particle size in the recrystallization process.
KeywordsRecrystallization Average Particle Size Initial Solute Ultrasonic Wave Ultrasonic Irradiation
Unable to display preview. Download preview PDF.
- 1.H. H. Willard,Analyt. Chem. 22 (1950) 1372.Google Scholar
- 2.E. Mori andK. Ito,Proc. Ultrasonic Int. 72 (1972) pp. 338–41.Google Scholar
- 3.Y. Ozaki, in “Ceramic Processing: Powder Preparation and Forming” (Yogyokyokai, Japan, 1984) p. 17.Google Scholar
- 4.T. Nakai, in “Chemical Engineering, Series 9, Crystal Analytic Engineering” (Baifukan, Japan, 1986) p. 6.Google Scholar
- 5.D. A. Porter andK. E. Easterling, in “Phase Transformation in Metals and Alloys” (van Nostrand Reinhold, 1981) p. 189.Google Scholar