It all starts with a pile of rusty scrap metal, any raw material that contains copper.
Then comes the high-temperature refining, which dissolves these raw materials into copper water.
During this process, workers inject oxygen at extremely high pressure in order to get the copper water to boil.
The molten copper (which also contains a fair amount of impurities) is flowed into molds, initially cooled, and sent to electrolysis tanks to remove impurities.
After the impurities are removed, the pure copper sheet is again sent to be melted and then cooled to a relatively coarse copper bar, which is stretched to become thinner and reach a certain diameter before it can be used as a copper rod.
