工业水处理 ›› 2024, Vol. 44 ›› Issue (1): 126-131. doi: 10.19965/j.cnki.iwt.2022-1292

• 试验研究 • 上一篇    下一篇

直流和脉冲电流对碳酸钙电沉积的影响

王啸(), 杨文忠()   

  1. 南京工业大学化学与分子工程学院,江苏 南京 210037
  • 收稿日期:2023-11-29 出版日期:2024-01-20 发布日期:2024-01-24
  • 作者简介:

    王啸(1998— ),硕士。电话:13348076062,E-mail:

    杨文忠,教授。E-mail:

Effect of direct current and pulse current on CaCO3 electrodeposition

Xiao WANG(), Wenzhong YANG()   

  1. College of Chemistry and Molecular Engineering,Nanjing Tech University,Nanjing 210037,China
  • Received:2023-11-29 Online:2024-01-20 Published:2024-01-24

摘要:

电化学沉积碳酸钙是减轻工业水系统中结垢的方法之一。采用脉冲电流和直流电研究CaCO3的电化学沉积过程,以及不同离子对脉冲沉积CaCO3的影响,并通过扫描电子显微镜和X射线衍射对其晶型和晶貌进行表征。实验结果表明,脉冲电流下CaCO3在304SS电极的成核速率快于直流电流,其促进了碳酸钙的熟化过程。Fe3+、PO4 3-、SiO3 2-和Mg2+的加入加速了CaCO3的结晶,但降低了沉积的致密性和厚度。脉冲电沉积的熟化过程使得结晶倾向于形成粒径更大的层叠形貌方解石,且方解石粒径大于直流电沉积所得。

关键词: 脉冲电流, 电沉积, 碳酸钙垢, 熟化

Abstract:

Electrochemical deposition of CaCO3 is one of the methods to reduce scaling in industrial water system. The pulse current(PC) and direct current(DC) were used to study the electrodeposition process of CaCO3,and the influence of different ions on PC electrodeposition of CaCO3. The crystal morphology of CaCO3 were characterized by SEM and XRD. The experimental results showed that the nucleation rate of CaCO3 on 304SS electrode under PC is faster than that under DC,which promoted the ripening process of calcium carbonate. The addition of Fe3+,PO4 3-,SiO3 2- and Mg2+ accelerated the crystallization of CaCO3,but decreased the density and thickness of the deposition. The ripening process of PC electrodeposition makes the crystallization tend to form layered calcite with larger particle size,and the calcite particle size is larger than that obtained by DC electrodeposition.

Key words: pulse current, electro-deposition, calcium carbonate scale, ripening

中图分类号: