High-Purity Zinc Anode Slab

This high-purity zinc anode slab is a semi-finished material specifically manufactured for use as a consumable anode in the electrolytic refining of non-ferrous metals. It serves as a sacrificial electrode that dissolves during electrolysis, releasing zinc ions into the electrolyte solution while maintaining structural integrity throughout the process. The slab's controlled composition, with a minimum zinc content of 99.995% by weight, ensures minimal contamination of the cathode product, making it essential for producing high-grade refined zinc. Its uniform dimensions and consistent metallurgical properties enable predictable dissolution rates and efficient refining operations. The slab is available in standard thicknesses of 8–12 mm, widths of 600–1000 mm, and lengths of 800–1200 mm, with a weight per slab of 50–100 kg. Key parameters include a density of 7.13–7.14 g/cm³ at 20°C, electrical conductivity of at least 16.5 MS/m, and a maximum operating temperature of 60°C. Surface finish is specified as ≤3.2 μm Ra, and flatness is ≤1.5 mm/m to ensure even current distribution. Lead content is limited to ≤0.001 ppm to prevent contamination. These specifications align with standards such as GB/T 470-2008 for purity and density, GB/T 2040-2008 for flatness, GB/T 1031-2009 for surface finish, and IEC 60468 for conductivity. However, these standards serve as procurement references; actual compliance must be verified with the manufacturer for the specific model. The slab's design supports predictable dissolution and efficient refining, but operational parameters such as current density and electrolyte composition must be optimized for each application. Regular inspection for surface passivation and dimensional stability is recommended to maintain performance.

The zinc anode slab operates as a sacrificial anode in electrolytic refining. During electrolysis, an external power source drives an electric current through the electrolyte, causing the zinc anode to oxidize and dissolve into the solution as zinc ions. This process releases electrons, which flow through the external circuit to the cathode, where zinc ions are reduced and deposited as high-purity metal. The anode's high purity and controlled composition ensure that impurities are minimized, preventing contamination of the cathode product. The slab's electrical conductivity, at least 16.5 MS/m, facilitates efficient electron transfer, while its flatness and surface finish help maintain uniform current distribution and reduce passivation. The maximum operating temperature of 60°C is critical; exceeding this can accelerate corrosion and deformation, leading to uneven dissolution and reduced efficiency. The anode gradually depletes over time and must be replaced periodically, with the dissolution rate influenced by current density and electrolyte conditions.