The Effect Of Slag Composition On Recycling Of
\“OFHC” Through The \“ESCM” Process
Author(s)
S. Ketabchi, F. K. Ahadi, K. Hanaee & S. H. Alhoseini
Abstract
This paper reports the results of an investigation into the role of the slag
composition in recycling Oxygen Free High Conductivity (OFHC) copper
through a modified Electroslag Remelting Process (ESR) melting technique
Electroslag Crucible Melting (ESCM). Materials used for the slag were alumina
(Al2O3), cryolite (Na3AlF6), sodium fluoride (NaF), and fluorine (CaF2) at
different ratios. The results showed that in addition to purity of the slag and
graphite used in the electrode and crucible, the percentage of alumina component
in the slag composition was the main factor in the attainment of the purity. The
best consequence was achieved when the content of alumina was in the range of
23–27%. Furthermore, in ternary compound systems with constant one
component, the influence of the weight ratio of the other components was
investigated, from a product purity viewpoint. Finally, in the optimized
condition, copper with 99.988% purity was achieved, yielding an electrical
conductivity of 100.1% IACS.
Keywords: OFHC copper, recycling processes, electro slag remelting, ESCM
process
1 Introduction
Recent developments in electronic industries and energy fields have pushed the
property requirements for oxygen free copper to the extreme. When recycling the
OFHC copper, the main problem is to reduce oxygen contamination because it
not only impairs the conductivity but also the mechanical properties of the
material, possibly leading to high scrap losses [1–4]. Oxygen free copper is used
in applications where the parts are going to be annealed in a hydrogen containing
Keywords
OFHC copper, recycling processes, electro slag remelting, ESCM
process
Related Book
Other papers in this volume
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