Pure copper for electrical use is produced INDUSTRIALLY using electroplating in reverse, called 'electrorefining'. A thin plate of pure copper (cathode) and a thick rod of impure copper (anode) are placed in copper sulphate solution. What happens?

At the impure anode, copper atoms (along with reactive impurities) go into solution. Cu²⁺ ions are then attracted to the cathode and deposit as ultra-pure copper. Non-copper impurities either remain dissolved or settle as 'anode sludge' (which is itself valuable — gold and silver are often recovered from it). This is the standard industrial purification of copper.