Preparation of high-purity copper through vacuum distillation
Chen et al. [21] investigated the preparation of high-purity copper through vacuum electron beam melting, the total impurity content reduced 64.7%, and the purity of copper was increased to 99.9996%, at the refining power of 9 kW, a refining time of 7 min, and a furnace pressure at 7.3 × 10 −2 Pa. Fu et al. [22] investigated the preparation ...