Effects of magnetic field on the precipitation of CaCO_3

doi:10.11894/1005-829x.2012.32(10).27

Abstract

Abstract:

The influence of magnetic field on calcium carbonate precipitation has been the subject of numerous investigations because calcium carbonate is the dominant component of scale.An adjustable magnetic treatment device(with the maximum magnetic flux density as 4 100 mT) equipped with automatic heating and recycled water system was designed.At different temperatures the parameters of conductance,turbidity and concentration of CaCO₃ of the solution were tested when calcocarbonic water flowed vertically throwing the magnetic field.The polymorph composition of CaCO₃obtained from the test was determined by XRD.The precipitation process of CaCO₃ was investigated and the mechanism through which the magnetic field exerts its influence on the processes was explained thermodynamically.The results suggest that the magnetic field influences the precipitation process and polymorph composition of CaCO₃ by influencing the hydration and dehydration process of hydrated CaCO3 as the precursor of crystal nuclei for the magnetic field changes the structure of water cluster.

Key words: magnetic effect, calcium carbonate, magnetic water treatment, recipitation?

摘要：

利用自行设计的磁化水循环装置，测定了不同温度下，含有Ca²⁺+CO₃^2-+HCO₃^2-的纯水溶液垂直通过均匀可调磁场(最高达4 100 mT)经磁处理后溶液的电导率、浊度和碳酸钙浓度的变化趋势，用XRD 测定了不同磁处理条件下得到的碳酸钙晶型，研究了碳酸钙的成核结晶过程，从热力学角度探讨了磁场对碳酸钙成核结晶过程的作用机理。实验结果表明，磁场对碳酸钙晶体生成速率和晶型结构的影响主要是因为磁处理改变了水分子簇的结构，从而改变了碳酸钙晶核先驱水合化碳酸钙的形成和脱水过程。

关键词: 磁效应, 碳酸钙, 磁水处理, 成核结晶

CLC Number:

TK228

Deng Aihua, Huang Huimin, Ji Wenjin. Effects of magnetic field on the precipitation of CaCO_3[J]. INDUSTRIAL WATER TREATMENT, 2012, 32(10): 27-30.

邓爱华, 黄慧民, 姬文晋. 磁场对碳酸钙成核结晶过程的影响[J]. 工业水处理, 2012, 32(10): 27-30.

/ / Recommend / Download Citations

URL: https://gyscl.magtechjournal.com/EN/10.11894/1005-829x.2012.32(10).27

https://gyscl.magtechjournal.com/EN/Y2012/V32/I10/27

References

[1] 黄征青，鲁国彬. 电磁处理防垢的研究与应用展望[J]. 工业用水与废水，2003，34（5）：10-12.
[2] 田党宏，蒲春生. 磁防垢除垢技术研究与应用新进展[J]. 石油工业技术监督，2005，21（6）：12-13.
[3] Coey J M D，Cass S. Magnetic water treatment[J]. Journal of Magnetismand Magnetic Materials，2000，209（1/2/3）： 71-74.
[4] 朱国栋，徐敬，李陈，等. 磁处理对碳酸钙过饱和溶液析晶影响的TLVM 研究[J]. 工业水处理， 2005，25（3）： 52-55.
[5] Lipus L C，Dobersek D. Influence of magnetic field on the aragoniteprecipitation[J]. Chemical Engineering Science，2007，62（7）：2089-2095.
[6] Tai C Y，Chang M C，Shieh R J，et al. Magnetic effects on crystalgrowth rate of calcite in a constant-composition environment[J].Journal of Crystal Growth，2008，310（15）：3690-3697.
[7] 刘振法，王延吉，田彩莉，等. 聚天冬氨酸与磁场协同效应对碳酸钙晶型及阻垢性能的影响[J]. 化工学报，2006，57（10）：2361-2366.
[8] Mwaba M G，Gu Junjie ，Golriz M R. Effect of magnetic field oncalcium sulfate crystal morphology [J]. Journal of Crystal Growth，2007，303（2）：381-386.
[9] Kobe S，Drazic G，Cefalas A C，et al. Nucleation and crystallizationof CaCO3 in applied magnetic fields[J]. Crystal Engineering，2002，5（3/4）：243-253.
[10] Knez S，Pohar C. The magnetic field influence on the polymorphcomposition of CaCO3 precipitated from carbonized aqueous solutions[J]. Journal of Colloid and Interface Science，2005，281 （2）：377-388.
[11] Tlili M M，Amor B M，Gabrielli C，et al. Characterization of CaCO3hydrates by micro-raman spectroscopy [J]. Raman Spectroscopy，2001，33（1）：10-16.
[12] Alimi F，Tlili M，Amor M B，et al. Influence of magnetic field oncalcium carbonate precipitation[J]. Desalination，2007，206（1/2/3）：163-168.
[13] Gal J Y，Bollinger J C，Tolosa H，et al. Calcium carbonate solubility：a reappraisal of scale formation and inhibition [J]. Talanta，1996，43（9）：1497-1509.
[14] 邓波，庞小峰. 静磁场作用下的水的性质改变[J]. 电子科技大学学报， 2008，37（6）：959-962.
[15] Cho Y I，Lee S H. Reduction in the surface tension of water due tophysical water treatment for fouling control in heat exchangers [J].International Communications in Heat and Mass Transfer，2005，32（1/2）：1-9.
[16] Amiri M C，Dadkhah A A. On reduction in the surface tension ofwater due to magnetic treatment[J]. Colloids and Surfaces A：Physicochem. Eng. Aspects.，2006，278（1/2/3）：252-255.
[17] 聂百胜，何学秋，冯志华，等. 磁化水在煤层注水中的应用[J].辽宁工程技术大学学报：自然科学版，2007，26（1）：1-3.
[18] Yuu F，Massaki L. The surface tension of water under high magneticfields[J]. Journal of Applied Physics，2008，103（12）：1-4.
[19] Cai Ran，Yang Hongwei，He Jinsong，et al. The effects of magneticfields on water molecular hydrogen bonds[J]. Journal of MolecularStructure，2009，938（1/2/3）：15-19.

Please choose a citation manager

Content to export