Process for the direct electrochemical refining of copper scrap
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United States of America Patent
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Dec 13, 1994
Grant Date -
N/A
app pub date -
Jun 3, 1993
filing date -
Jun 3, 1992
priority date (Note) -
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Abstract
Copper scrap, reduced to particulate form having particle sizes not larger than 50 mm, is leached in a suitable apparatus with a solution of ferric fluoroborate in fluoroboric acid. During leaching, copper is dissolved, with ferric fluoroborate simultaneously being reduced to ferrous fluoroborate according to the following reaction: 2 Fe(BF.sub.4).sub.3 +Cu.fwdarw.Cu(BF.sub.4).sub.2 +2 Fe(BF.sub.4).sub.2(1) The resulting solution is fed to the cathodic compartment of diaphragm cell, in which copper is deposited, in compact and highly pure form, on a stainless steel cathode, from which it is periodically recovered.
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