Influence of Magnetic Field on Calcium Carbonate Precipitation in the Presence of Foreign Ions

Abstract:

In this paper, the effect of the adjustable permanent magnetic field with the maximum magnetic flux density as 4100mT on the calcium carbonate(CaCO₃) precipitation process was investigated from hard water in the absence and in the presence of foreign ions Al³⁺、Fe²⁺、Mg²⁺、SO₄²⁺. By changing the strength of the magnetic field, the fouling resistance efficiency, the total CaCO₃ precipitation and precipitation in the bulk solution were determined by measurement of the mass of CaCO₃ precipitation, and the polymorph composition of CaCO₃ precipitated in bulk solution and particle size fouling on the loading slice was determined by XRD and electron microscope. The effect of MF on the precipitation process of CaCO₃ was tested by degassifying dissolved CO₂ in calcocarbonic pure water containing foreign ions. The results showed that magnetic water treatment increased the total precipitation and favored the precipitation in bulk solution instead of precipitating on the walls regardless the presence of foreign ions. The effect is intensifying with the strengthening of the magnetic flux indendity. The Magnetic field (MF) did not affect the polymorph composition of CaCO₃ in the absence of foreign ions. While in the presence of foreign ions, the precipitation and structure of precipitated CaCO₃ were significantly affected. The MF favored the precipitation of aragonite and inhibited the formation of calcitein the presence of Mg²⁺ and SO₄^2-. In the case of Al³⁺ and Fe²⁺, the precipitation of aragonite is favored, calcite and vaterite is inhibited. The MF influenced CaCO₃ precipitation process by influencing the hydration process of the ions in the solution and changing the dehydration process of hydrated CaCO₃ as the precursor of crystal nuclei for the magnetic field change the structure of water cluster. The reason that foreign ions can change the polymorph composition of CaCO₃ is probably owing to its hydration and dehydration.

• Periodical: Advanced Materials Research (Volumes 554-556)
• Pages: 649-656
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.554-556.649
• Online since: July 2012
• Authors: Ai Hua Deng, Hui Min Huang, Wen Jin Ji
• Keywords: Calcium Carbonate Precipitation, Crystal Morphology, Foreign Ions, Fouling Resistance Efficiency, Magnetic Field

References

[1] Zhenqing Huang, Guobin Lu: Industrial water& Wasterwater Vol.34 (2003), pp.10-12.

[2] Danghong Tian, Chunsheng Pu: Technology Supervision in Petrolem Industry Vol. 21 (2005), pp.12-13.

[3] J.M.D. Coey, Stephen Cass: Journal of Magnetism and Magnetic Materials Vol. 209 (2000), pp.71-74.

[4] Guodong Zhu, Jing Xu, Dong Li: Industrial Water Treatment Vol.25 (2005), pp.52-55.

[5] L.C. Lipus, D.Dobersek. Chemical Engineering Science Vol. 62 (2007), pp.2089-2095.

[6] Clifford Y.Tai, Meng-Chun Chang, Rong-Jong Shieh, Ted G.Chen: Journal of Crystal Growth Vol.310 (2008), pp.3690-3697.

[7] Zhenfa Liu，Yanji Wang， Caili Tian，Yanhe Zhang. Journal of Chemical Industry and Engineering Vol.57 (2006), pp.2361-2366.

[8] Misheck.G. Mwaba, Junjie Gu, Mohammad R.Golriz: Journal of Crystal Growth Vol.10 (2007), p.1016~1021.

[9] S.Kobe, G.Drazic, A.C. Cefalas, E.Sarantopoulou, J.Strazisar: Crystal Engineering Vol.5 (2002), pp.243-253.

[10] V.Kozic, L.C. Lipus: J. Chem. Inf. Comput. Sci. Vol. 43 (2003), pp.1815-1819.

[11] R.E. Herzog, Q.H. Shi, J.N. Patil, J.L. Katz: Langmuir Vol.5 (1998), pp.861-867.

[12] K.W. Busch, S.Gopalakrishnan, M.A. Busch,: J.Colloid Interf. Sci. Vol.183 (1996), pp.528-538.

[13] Sergej Knez, Ciril Pohar: Journal of Colloid and Interface Science Vol.281 (2005), pp.377-388.

[14] O. T. Krylov, I.K. Vikulova, V.K. Eletskii: Coll.J.USSR Vol.47 (1985), p.820~824.

[15] L. Hoysz, M. Chibowski, E.Chibowski. Colloid and Sufaces A: Physicochemical and Engineering Aspects Vol.14 (2002), p.231~240.

[16] K. Higashitani: Process Saf. Environ. Prot Vol.75 (1997), p.115~119.

[17] S.Kobe, G. Drazic: Crystal Engineering Vol.5 (2002), p.243~253.

[18] Fathi Alimi, Mohamed Tlili: Desalination Vol.206 (2007), p.163~168.

[19] F.Alimi, M.Tlimi, M.Ben Amor: Electrical Processes in Engineering and Chemistry Vol.45 (2009), p.56~62.