Cathode roll: With the improvement of customer requirements and the development of technology, the diameter of the cathode roll has increased from 1m and 1.5m to 2.2m and 2.7m, and the width is 1400mm~1500mm. The material is now mostly pure titanium. The cathode roll has good corrosion resistance, and its surface quality directly affects the surface quality and visual effect of raw (original) foil, so the roll surface roughness Ra<0.3 μ m。

Anode seat: insoluble anode, currently used materials, one is lead antimony alloy (or lead silver alloy), the other is titanium. However, with the extension of service time, the alloy corrosion of the former is more and more, resulting in the continuous increase of pole distance, the rise of cell voltage and the increase of power consumption; At the same time, because the corrosion is not very uniform, it also affects the consistency of the pole distance, so that the uniformity of the copper foil is also poor. The latter consists of titanium matrix and coating. The coating is a mixture of iridium (56%) and tantalum (44%). This anode has good corrosion resistance, and the cell voltage will not increase within a certain limit. Therefore, the thickness of raw foil is uniform, but the one-time investment is large. Even if the coating is damaged and thinned, it can be repaired by recoating.

Green foil manufacturing: copper sulfate is used as electrolyte, and its main components are Cu2+and H+. Under the action of direct current, cations move to the cathode and anions move to the anode. Cu2+is reduced to Cu by two electrons on the cathode and crystallizes on the cathode roller to form green foil. After electrolytic process, the content of Cu2+in electrolyte decreases and the content of H2SO4 increases. The electrolyte returns to the copper dissolving tank for adjustment, so that the electrolyte Cu2+increases and the H2SO4 content decreases. The contents of Cu2+and H2SO4 in the electrolyte are kept in balance by electrolysis and copper dissolution.