| Issue |
Korean Journal of Chemical Engineering,
Vol.25, No.5, 1145-1150, 2008
Vol.25, No.5, 1145-1150, 2008
Effects of magnetic field on calcium carbonate precipitation: Ionic and particle mechanisms
There are two most widely reported mechanisms to study the effect of magnetic fields on calcium carbonate (CaCO3) precipitate, namely ionic and particle mechanisms. The effects are most debatable because they are contrary to each other. This study explored the effects of both mechanisms in CaCO3 deposit and total CaCO3 precipitation using ionic and particle methods. The ionic method showed reductions in CaCO3 deposit and total precipitation rate of CaCO3, whereas the particle method showed the opposite results. The particle number decreased and the average particle diameter of CaCO3 deposit increased in the ionic method. Meanwhile in the particle method, the particle number increased, average particle diameter decreased and particle aggregation of CaCO3 was observed. XRD measurement on all deposits showed that the crystal deposit was mostly of calcite and the traces of vaterite. However, the amount of the crystal in the particle method was observed to be less than that in the ionic method, indicating that CaCO3
deposit was more amorphous. Particle mechanism decreased the Ca2+ ion concentration in solution during magnetization, and ionic mechanism reduced scale (CaCO3) formation after magnetization and separation processes. This method could be applied for decreasing water hardness and prevent the formation of scaling.
[References]
- Vemeiren T, Corros. Technol., 5, 215, 1958
- Grutsch JF, USA/USSR symposium of physical mechanical treatment of wastewaters, EPA, Cincinnati, 44, 1977
- Grutsch JF, McClintock JW, Corrosion and deposit control in alkaline cooling water using magnetic water treatment at Amoco’s largest refinery, Corrosion 84 NACE, New Orleans, pp. 330, 1984
- Baker J, Judd S, Water Res., 30(2), 247, 1996
- Oshitani J, Uehara R, Higashitani K, J. Colloid Interface Sci., 209(2), 374, 1999
- Busch KW, Busch MA, Parker DH, Darling RE, McAtee Jr JL, Corros. NACE, 42(4), 211, 1986
- Kney AD, Parsons SA, Water Res., 40, 517, 2006
- Higashitani K, Kage A, Katamura S, Imai K, Hatade S, J. Colloid Interface Sci., 156, 90, 1993
- Chibowski E, Holysz L, Szczes A, Chibowski M, Colloids Surf. A: Physicochem. Eng. Asp., 225, 63, 2003
- Barrett RA, Parsons SA, Water Res., 32(3), 609, 1998
- Higashitani K, Oshitani J, J. Colloid Interface Sci., 204(2), 363, 1998
- Wang Y, Babchin AJ, Chernyi LT, Chow RS, Swatzky RP, Water Res., 31(2), 346, 1997
- Lundager Madsen HE, J. Cryst. Growth, 152, 94, 1995
- Lundager Madsen HE, J. Cryst. Growth, 267, 251, 2004
- Wang YM, Pugh RJ, Forssberg E, Colloids Surf. A: Physicochem. Eng. Asp., 902(2-3), 117, 1994
- Gabrielli C, Jaouhari R, Maurin G, Keddam M, Water Res., 35(13), 3249, 2001
- Ahn JW, Kim JH, Park HS, Kim JA, Han C, Kim H, Korean J. Chem. Eng., 22(6), 852, 2005
- Kobe S, Drazicc G, Cefalas AC, Sarantopoulou E, Cryst. Eng., 5, 243, 2002
- Knez S, Pohar C, J. Colloid Interface Sci., 281(2), 377, 2005
- Chibowski E, Holysz L, Holysz A, Water Res., 37, 4685, 2003
- Abdel-Aal N, Satoh K, Sawada K, J. Cryst. Growth, 245(1-2), 87, 2002
- Ben Amor M, Zgolli D, Tlili MM, Manzola AS, Desalination, 166(1-3), 79, 2004
- Fathi A, Fathii M, Gabrelli C, Maurin G, Ben Amor M, Water Res., 40, 1941, 2006
[Cited By]
참고문헌정보(참고문헌, 인용문헌)는 화학공학소재연구정보센터에 의해 제공되고 있습니다.