Hydrometallurgical process for the recovery of lead
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United States of America Patent
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-
Jun 30, 1981
Grant Date -
N/A
app pub date -
Oct 1, 1979
filing date -
Oct 1, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydrometallurgical process is used to recover lead from a lead-bearing ore concentrate. The lead-bearing ore concentrate is leached with a solution of cupric chloride in order to precipitate lead as lead chloride, produce elemental sulfur and substantially leave the balance of the ore concentrate sulfides in unreacted form. The residue of the cupric chloride leach is leached with a brine solution in order to solubilize the lead chloride to the exclusion of the balance of the residue. Thereafter, the lead chloride is crystallized from the brine solution. Elemental lead may be obtained by the reduction of the lead chloride crystals. The present process avoids air pollution problems inherent to smelting processes, allows for a high recovery of lead of 97% or greater and allows for the direct production of a high purity lead.
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