Manufacturing OFC with recycled copper by charcoal-filtration

Deoxidation of both cathode and recycled copper by calcined charcoal filtration was conducted experimentally. The oxygen concentrations as well as the electrical resistivities of samples were measured. Results show that charcoal filtration is very suitable for manufacturing oxygen free copper. It is an effective method for oxygen removal from molten copper, and does little harm to the electrical conductivity of copper. With proper filtration process, the oxygen concentration in the recycled copper melts can be controlled under 5 ppm or less, and the electrical resistivity of the filtered sample is about 1.750 μΩ cm.