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DEVELOPMENT OF CONTINUOUS ZINC ELECTROWINNING

Research Project

Project/Area Number 02555168
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 工業物理化学・複合材料
Research InstitutionYAMANASHI UNIVERSITY

Principal Investigator

FURUYA Nagakazu  YAMANASHI UNIV., 工学部, 教授 (70020485)

Co-Investigator(Kenkyū-buntansha) SHIBATA Masami  YAMANASHI UNIV., 工学部, 助教授 (40115316)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥13,600,000 (Direct Cost: ¥13,600,000)
Fiscal Year 1992: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1991: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1990: ¥7,300,000 (Direct Cost: ¥7,300,000)
KeywordsGas-diffusion Electrode / Hydrogen Nonode / Zinc / Electrowinning / 鉛 / 水素アソード / アルミディスク / 電解 / 復極水素 / アルミニウムディスク / 水素復極
Research Abstract

Electrowinning is the most important method by which zinc is produced. This process uses a low current density (57mA/cm^2) and high cell voltage (3.6V), because the anode polarization and the ohmic drop in the electrolyte are large. The anode is made from a lead-silver alloy which usually contains 0.5% Ag. The cathode is Al plate.
We replaced the anode to a gas diffusion electrode (400cm^2) and hydrogen is fed to the gas diffusion electrode and the cathode to 1mphi Al rotating disk. The gap between anode and cathode is 4mm. The electrolyte solution, containing 60g/1 Zn and 180g/1 H_2SO_4 was purified by Zn powder. The new type continuous zinc electrowinning system produced a belted zinc. The cell voltage is 1.81V at 0.35A/cm^2 and 2.67V at 0.7A/cm^2 respectively. The current efficiency 90% at 0.45A/cm^2 and 86.5% at 0.7A/cm^2 respectively. The zinc purity is 99.999%. The energy usage of the system is 1400kWh and 380m^3 H_2 gas per ton of zinc. This system will be easily put into practice.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] Nagakazu FURUYA: "High Speed Zinc Electrowinning Using a Hydrogen Gas-diffusion Electrode(2)" J.Appl.Electrochem.(London). 20. 475-478 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nagakazu Furuya: "High Speed Zinc Electrowinning Using a Hydrogen Gas-Diffusion Electrode (2)" J. Appl. Electrochem. ( London). Vol.20. 475-478 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Nagakazu Furuya: "High Speed Zinc Electrowinning Using a Htdrogen Gas-Diffusion Electrode(2)" J.Appl.Electrocnem(London). 20. 475-478 (1990)

    • Related Report
      1992 Annual Research Report
  • [Publications] Nagakazu Furuya: "High Speed Zinc Electrowinning Using a Hydrogen Gas-Diffusion Electrode(2)" J.Appl.Electrocnem(London).

    • Related Report
      1991 Annual Research Report
  • [Publications] Nagakazu Furuya: "High Speed Zinc Electrowinning Using a Hydrogen GasーDiffusion Electrode" J.Appl.Electrocnem(London). 20. 475-478 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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