为阐明交变外磁场对硫酸钙垢溶解行为的影响规律,采用离子浓度、电导率和红外光谱等手段检测硫酸钙垢溶解液的性质,并利用X射线衍射（XRD）和检测硫酸钙垢溶解量等方法对硫酸钙垢进行表征和分析。结果表明,交变外磁场对硫酸钙垢的溶解有明显的促进作用。与无磁场作用的硫酸钙垢溶解液相比,交变外磁场作用60 min后硫酸钙垢溶解液的硫酸根质量浓度由2.41 g/L增大至3.52 g/L,电导率由5.85 mS/cm增大至7.24 mS/cm,硫酸钙垢的溶解量增加了40%。外加交变磁场可以促进硫酸钙垢溶解的原因是,外加交变磁场可以使蒸馏水中亲水性羟基的比例增加,促进水分子与硫酸钙垢的分子亲合力。此外,交变外磁场的作用还导致硫酸钙垢的结晶度减小、主晶面的面间距增大,最终有利于垢与水的接触和溶解。此研究可为利用交变外磁场调控硫酸钙垢的溶解行为提供理论依据。

In order to clarify the influence of the alternating external magnetic field on the dissolution behavior of calcium sulfate scale,ion concentration,conductivity and infrared spectroscopy were used to detect the properties of calcium sulfate scale solution,X-ray diffraction（XRD） and detecting the dissolved amount of calcium sulfate scale and other methods were used to characterize and analyze calcium sulfate scale.The results showed that the alternating external magnetic field could obviously promote the dissolution of calcium sulfate scale.Compared with the calcium sulfate scale solution without magnetic field effect,when the alternating external magnetic field was acted for 60 min,the sulfate radical mass concentration of calci-um sulfate scale dissolving solution increased from 2.41 g/L to 3.52 g/L,the conductivity increased from 5.85 mS/cm to 7.24 mS/cm,and the dissolved amount of calcium sulfate scale increased by 40%.The reason of the external alternating magnetic field promoting the dissolution was that the external alternating magnetic field could increase the percentage of hydrophilic hydroxyl groups in distilled water,and promote the molecular affinity of water molecules and calcium sulfate scale.In addition,the effect of the alternating external magnetic field also caused the crystallinity of calcium sulfate scale to decrease,and the interplanar spacing of the main crystal planes to increase,which was ultimately conducive to the contact and dissolution of scale and water.The research could provide theoretical basis for the use of alternating external magnetic fields to control the dissolution behavior of calcium sulfate scale.