PRODUCTION OF EXTRA-LOW OXYGEN COPPER AND EXTRA-LOW OXYGEN COPPER OBTAINED BY THIS PRODUCTION

摘要

PURPOSE: To provide the process for production of the extra-low oxygen copper having an oxygen concn. of a specific value or below. ;CONSTITUTION: The extra-low oxygen copper is produced by (1) a stage for deoxidizing by maintaining the molten state of raw material copper in the presence of graphite, (2) a stage for dissolving the raw material copper and deoxidizing the raw material copper while blowing a reducing gas thereto and (3) a stage for dissolving the raw material copper in the presence of the graphite and deoxidizing the molten copper obtd. in such a manner while blowing an inert gas or reducing gas in the presence of the graphite to the copper and by decreasing the oxygen concn. to ≤0.5ppm by temporarily adding copper oxide thereto during the course of any of the above-mentioned stages (1) to (3).;COPYRIGHT: (C)1993,JPO&Japio