【摘要】 为掌握超声预处理EDTA二钠对硫酸钙垢溶解效果的影响规律，开展了超声预处理EDTA二钠溶液溶解硫酸钙垢试验。采用XRD、FTIR等手段分别对垢体和EDTA二钠溶液进行了分析，结果表明：在超声功率为168 W时，硫酸钙垢溶解率最高，达57.40%,溶液电导率为20.10 mS/cm,较未处理时的硫酸钙垢溶解率提高了10.40百分点；超声预处理可使EDTA二钠溶液中亲水性的缔合水羟基及乙二胺四乙酸根的羟基含量升高，促进垢体表面的活性点钙离子的水合作用，吸附水进入垢体内部，使其体积膨胀；溶液中的乙二胺四乙酸根离子可与垢体表面钙离子生成钙盐络合物，促进垢体表面的钙离子向溶液中迁移及垢体溶解。更多还原

【Abstract】 In order to master the effect of ultrasonic pretreatment of EDTA disodium on the dissolution of calcium sulfate scale, the experiment of ultrasonic pretreatment of EDTA disodium solution to dissolve calcium sulfate scale was carried out. The scale and EDTA disodium solution were characterized and analyzed by XRD and FTIR and other methods, respectively. The results show that when the ultrasonic power is 168 W, the dissolution rate of calcium sulfate scale is the highest, reaching 57.40%, and the solution conductivity is 20.10 mS/cm, which is 10.40 percentage points higher than that of untreated calcium sulfate scale. Ultrasonic pretreatment can increase the content of hydrophilic hydroxyl groups of associated water and hydroxyl groups of ethylenediaminetetraacetate in EDTA disodium solution. The increase of hydroxyl content of associated water can promote the hydration of calcium ions at the active point on the surface of the scale, and the adsorbed water enters the scale and expands its volume. Ethylenediaminetetraacetate ions in the solution can form calcium salt complexes with calcium ions on the surface of the scale, which promotes the migration of calcium ions on the surface of the scale to the solution and the dissolution of the scale.更多还原