C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/333
C22B 13/02 (2006.01) C22B 5/14 (2006.01)
Patent
CA 1181244
A B S T R A C T Lead is recovered from sulphidic lead raw-material containing im- purities of the kind bismuth, arsenic, antimony and tin, by flame- -smelting the material with an oxygen-containing gas. The oxygen potential and temperature are adapted during the flame-smelting process so that the product formed thereby comprises substantially a lead-sulphide melt substantially free of volatile, sulphidic and metallic impurities of the said kind. The lead-sulphide melt is brought into contact with an oxidic lead material substantially free of impurities of the aforementioned kind, while oxidising the sulphide-sulphur content of the material and forming a melt sub- stantially free of sulphur. Lead is recovered from the melt by separation, optionally after subjecting the melt or a part there- of to a reducing process.
390718
Jensfelt Torsten E.
Petersson Stig A.
Boliden Aktiebolag
Gowling Lafleur Henderson Llp
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