Fundamental study for higher current density operation of copper electrorefining by controlling polarization with fluid flow of electrolyte

• Project/Area Number: 23560894
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Metal making engineering
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: TAKASU Tomio 九州工業大学, 工学(系)研究科(研究院), 准教授 (20264129)
• Co-Investigator(Kenkyū-buntansha): ITOU Hideyuki 九州工業大学, 工学研究院, 助教 (90213074)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2013: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 銅電解 / 電解液流動 / 分極制御 / 高電流密度 / 電解精製 / モデル化 / 銅製錬 / 不純物

Research Abstract

A higher current density operation of copper electrorefining is desired to achieve the higher productivity. It is important to control the mass transfer on the electrodes and hence to acquire systematic data under the clear conditions of the mass transfer because many factors of electrolysis mutually affect each other. In this research, effects of fluid flow on the electrolysis were investigated by using RDE (rotating disk electrode) since the apparatus is small and the control is easy. Increasing the current density increased the polarization and the roughness of the deposit. Increasing the rotation speed decreased the polarization and made the surface flat. The additions of impurity elements changed the electrode potential in the high current density even with the rotation of the electrode. The addition of glue increased the polarization even with the fluid flow and achieved the flat surface.

Research Products

• [Presentation] 銅電解精製の陰極析出挙動に及ぼす電解液流動の影響 (2013)
  • Author(s): 田畑仁志, 持田侑希, 伊藤秀行, 高須登実男
  • Organizer: 資源・素材学会九州支部平成25年度春季例会
  • Place of Presentation: 熊本
  • Year and Date: 2013-05-31
• [Presentation] 銅電解精製の高電流密度化に関する基礎研究 (2013)
  • Author(s): 高須登実男, 持田侑希, 伊藤秀行
  • Organizer: 資源・素材学会平成25年度春季大会研究・業績発表講演会
  • Place of Presentation: 習志野
  • Year and Date: 2013-03-28
• [Presentation] 銅電解精製に及ぼす電解液流動の影響 (2012)
  • Author(s): 持田侑希, 伊藤秀行, 高須登実男
  • Organizer: 資源・素材学会九州支部平成24年度春季例会
  • Place of Presentation: 福岡
  • Year and Date: 2012-05-25
• [Presentation] 銅電解精製に及ぼす電解液流動の影響
  • Author(s): 持田侑希、伊藤秀行、高須登実男
  • Organizer: 資源・素材学会 九州支部 平成24年度春季例会講演要旨集、pp.27-29
  • Place of Presentation: 福岡
• [Presentation] 銅電解精製の高電流密度化に関する基礎研究
  • Author(s): 高須登実男、持田侑希、伊藤秀行
  • Organizer: 資源・素材学会 平成25年度春季大会研究・業績発表講演会、春季大会講演集、pp.5-8
  • Place of Presentation: 習志野