Process for producing electrolytic lead and elemental sulfur from galena
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United States of America Patent
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Aug 13, 1991
Grant Date -
N/A
app pub date -
Jul 30, 1990
filing date -
Jul 31, 1989
priority date (Note) -
Expired
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Abstract
A process for producing electrolytic lead and elemental sulfur from galena comprises the steps of leaching galena with an acidic aqueous solution of ferric fluoborate, with ferrous fluoborate, lead fluoborate, and elemental sulfur being formed according to the reaction: 2 Fe(BF.sub.4).sub.3 +PbS.fwdarw.2 FE(BF.sub.4).sub.2 +Pb(BF.sub.4).sub.2 +S. In a further step, a solid residue produced in the leaching step is filtered off, the solid residue comprising elemental sulfur and galena gangue. The solution of ferrous fluoborate and lead fluoborate formed in the leaching step is subjected to electrolysis in a diaphragm electrolytic cell in which pure lead is deposited at a cathode of the cell and ferrous ions are oxidated to ferric ions at an anode of the cell. A solution of ferric fluoborate regenerated at the anode in the electrolysis step is recycled to the leaching step so that the solution is subjected to the galena leaching step.
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