Abstract:

The influences of polyaspartic acid alone,magnetic field alone，and their synergism on the crystal forms of calcium carbonate and the scale inhibition performance were investigated.The calcium carbonate crystal samples were characterized with SEM and XRD.The results showed that magnetized water treatment could increase the aragonite/calcite mass ratio in the deposited samples from 1∶3 to 1∶1.3 and the crystal phase of crystalline calcium carbonate was changed to vaterite almost completely，when polyaspartic acid was added.In addition，polyaspartic acid was able to chelat Ca²⁺ ion，which could be enhanced by the synergism of magnetic field and polyaspartic acid.A dynamic experimental device equipped with automatic heating and recycled water system was designed and assembled by the authors.The situation of calcium carbonate scale on the heat transfer surface was measured under different experimental conditions.Magnetic field and polyaspartic acid showed good synergism effect of scale inhibition and a scale inhibition rate of 69.5% was achieved whereas the scale inhibition rate in the magnetized water was 32.2% and that in the 3 mg·L^-1 polyaspartic acid solution was 55.2%.

Key words:

聚天冬氨酸, 磁场, 碳酸钙, 磁化水处理, 协同作用

摘要：

研究了单独使用环保型高分子聚合物——聚天冬氨酸、磁场以及磁场与聚天冬氨酸的协同作用对碳酸钙晶型和阻垢性能的影响.利用扫描电子显微镜和X射线衍射等技术对碳酸钙晶体进行观察和晶型分析，结果表明：与普通水比较，磁化水可使碳酸钙结晶中文石与方解石的比例由1∶3转变为1∶1.3;聚天冬氨酸的存在可使碳酸钙晶体几乎全部转化成球霰石结构;聚天冬氨酸对Ca²⁺有螯合作用，磁场与聚天冬氨酸的协同作用可进一步提高对Ca²⁺的螯合作用.利用自行设计的带有加热系统的循环水动态实验装置，测定了不同条件下传热面上的结垢情况.实验结果表明，磁化水的阻垢率为32.2%，浓度为3 mg·L^-1的聚天冬氨酸溶液阻垢率为55.2%，磁场与聚天冬氨酸协同作用时的阻垢率为69.5%，具有很好的协同阻垢作用.

关键词:

聚天冬氨酸, 磁场, 碳酸钙, 磁化水处理, 协同作用