1.013
IF5
0.901
IF
20
MNiSW
539
Cites 2016
 
 

Chloride leaching of silver and lead from a solid residue after atmospheric leaching of flotation copper concentrates

Tomasz Chmielewski 1  ,  
 
1
Faculty of Chemistry, Wroclaw University of Science and Technology
2
University of Wroclaw
Physicochem. Probl. Miner. Process. 2017;53(2):893–907
Publish date: 2017-04-19
KEYWORDS:
TOPICS:
ABSTRACT:
Recovery of silver and lead by means of chloride leaching of solid residue after atmospheric leaching of the copper concentrate from Lubin Concentrator (KGHM) was investigated. The effect of leaching temperature, chloride concentration, Fe(III) and oxygen presence, solid-to-liquid ratio and feed preleaching with NaOH on the silver and lead recovery was analyzed. Chloride leaching appeared to be very effective for recovery of lead, whereas satisfactory recovery of silver was observed after chemical pretreatment of the leaching feed with alkali solution of NaOH in order to liberate Ag entrapped in the jarosite structure. It was found that to achieve the satisfactory recovery of Ag and Pb leaching had to be performed in acidified 4 M chloride concentration at temperature of 90 oC. The presence of oxidants, that is O2 and iron(III) ions, was beneficial in the initial stage of the process. The maximum recovery of Ag and Pb was found for the solid-to-liquid ratio of 1:10 after 10 hours leaching.
CORRESPONDING AUTHOR:
Tomasz Chmielewski   
Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
 
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