C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/289
C22B 3/08 (2006.01) C01G 3/12 (2006.01) C01G 49/14 (2006.01) C22B 1/00 (2006.01) C22B 1/06 (2006.01) C22B 15/00 (2006.01)
Patent
CA 1179509
T I T L E IRON - COPPER SEPARATION BY REDUCTION LEACHING I N V E N T O R S Ernest Peters Ralph Hackl ABSTRACT OF THE DISCLOSURE Iron-copper separation from sulfide minerals, concentrates,tailings or partial calcines containing these metals, has been achieved by leaching in acid sulphate solutions under reducing conditions to convert all of the unoxidized sulfur to chalcocite (Cu2S) solids and to bring all of the iron into solution. It has been found that this reduction leach will proceed if there is present at least two moles of copper for each mole of sulfide and elemental sulfur, and a reducing agent able to complete all reduction reactions that yield chalcocite. Metallic copper powder has been found an adequate reducing agent and is able to supply any Cu needed to form Cu2S. Iron powder or hydrogen gas under pressure are also operative reducing agents. This reduction leach is operative also on calcines from which sul- fur has been volatilized, in which case a metallic copper concentrate is formed. Various flowsheets incorporating this reduction leach are described. This reduction leaching avoids H2S evolution,
385008
Hackl Ralph
Peters Ernest
Canadian Patents And Development Limited - Societe Canadienne De
Thomson Alan A.
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