PRODUCTION OF HIGH-PURITY OXYGEN-FREE COPPER

摘要

PURPOSE:To easily remove an element such as S which is the most difficult to remove among impurities with less repetitions by adding an element capable of forming a compd. with S, etc., to the base material to be electrically refined. CONSTITUTION:Oxygen-free copper having relatively high purity and contg. =100ppm impurities is selected as the raw material. An element capable of forming a compd. especially with S or with the Se, As, and P having the properties analogous to those of S is added by =200ppm in total to the oxygen-free copper. As a result, the elements combine with the S and other analogous elements in the raw material to form their compds. which are deposited. When electrolytic refining is carried out under such conditions, the deposits are easily separated by the electrolysis, and high-purity oxygen-free copper can be obtained with less repetitions.