抄録
The anion exchange method in a hydrochloric acid solution was applied for the preparation of high purity copper using CuCl as a starting material. The purified copper chloride solution was evaporated to dryness and reduced by hydrogen. After arc-melting, specimens with the dimensions of 0.5×1.0×20 mm3 were prepared by cold rolling and subjected to the annealing process which consists of heating in dry hydrogen for 20 h and in vacuum for 20 h at 873 K. The residual resistivity ratio of purified copper was 1470, while that of the copper prepared directly from the starting material and treated in the same way was 36. This result revealed that the anion exchange method is very effective for the preparation of high purity copper.
