DEVELOPMENT OF CONTINUOUS ZINC ELECTROWINNING

连续电积锌技术的发展

• 批准号: 02555168
• 负责人: FURUYA Nagakazu
• 金额: $ 8.7万
• 依托单位: YAMANASHI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555168/
• 关键词: Gas-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

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.

电积法是生产锌的最重要的方法。该工艺使用低电流密度(57 mA/cm^2)和高电池电压(3.6V)，因为阳极极化和电解液中的欧姆降较大。阳极由铅银合金制成，通常含有0.5%的银。阴极为铝板，将阳极改为400 cm~2的气体扩散电极，氢气送入气体扩散电极，阴极送入1mphi Al转盘。阳极和阴极之间的间隙为4 mm。用锌粉净化含锌60g/l、硫酸180g/l的电解液。新型连续锌电积系统生产出带状锌。电池电压在0.35A/cm2和0.7A/cm2时分别为1.81V和2.67V。电流效率在0.45A/cm~2和0.7A/cm~2时分别为90%和86.5%。锌纯度为99.999%。该系统的能耗为1400kWh/吨锌，380m^3/t锌氢气。这一制度将很容易付诸实施。

项目成果

Nagakazu Furuya: "High Speed Zinc Electrowinning Using a Hydrogen Gas-Diffusion Electrode (2)" J. Appl. Electrochem. ( London). Vol.20. 475-478 (1990)

Nagakazu Furuya：“使用氢气扩散电极进行高速锌电解（2）”J. Appl。

Nagakazu Furuya: "High Speed Zinc Electrowinning Using a Hydrogen Gas-Diffusion Electrode(2)" J.Appl.Electrocnem(London).

Nagakazu Furuya：“使用氢气扩散电极进行高速锌电解沉积(2)”J.Appl.Electrocnem（伦敦）。

Nagakazu Furuya: "High Speed Zinc Electrowinning Using a Hydrogen GasーDiffusion Electrode" J.Appl.Electrocnem(London). 20. 475-478 (1990)

Nagakazu Furuya：“使用氢气扩散电极高速电解沉积”J.Appl.Electrocnem（伦敦）20. 475-478 (1990)。

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

Nagakazu FURUYA：“使用氢气扩散电极进行高速锌电解沉积(2)”J.Appl.Electrochem.（伦敦）。

Nagakazu Furuya: "High Speed Zinc Electrowinning Using a Htdrogen Gas-Diffusion Electrode(2)" J.Appl.Electrocnem(London). 20. 475-478 (1990)

Nagakazu Furuya：“使用氢气扩散电极进行高速锌电解沉积(2)”J.Appl.Electrocnem（伦敦）。