Preparation method of 7N ultra pure copper

The invention discloses a preparation method of 7N ultra pure copper. The method includes the steps that a copper sulfate solution is used as electrolyte, the prepared electrolyte is placed in an electrolytic cell, an anode plate is made of a copper raw material, a titanium plate is used as a cathode plate, the anode plate and the cathode plate are then placed in the electrolytic cell, electrolytic reaction is then started, direct-current electrolysis is conducted, and the 7N ultra pure copper is obtained on the cathode plate. By means of the preparation method, impurities in the electrolyte can be effectively removed, the preparation process is simple in process, required devices are simple, capacity of each single device is large, the preparation cost is low, the amount of impurities contained in the prepared ultra pure copper is small, the 7N quality requirement can be met, and environment pollution cannot be caused in the preparation process. 本发明公开了一种7N超纯铜的制备方法，该方法以硫酸铜溶液作为电解液，将配制的电解液装入电解槽中，并以铜原料制作阳极板，以钛板作