Hydrometallurgical treatment of hazardous copper Cottrell dusts to recover copper
 
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1
Centro Nacional de Investigaciones Metalurgicas CENIM-CSIC
2
Poznan University of Technology, Institute of Chemical Technology and Engineering, ul. Berdychowo 4, Poznan, Poland
CORRESPONDING AUTHOR
Francisco Jose Alguacil   

Centro Nacional de Investigaciones Metalurgicas CENIM-CSIC, Avda. Gregorio del Amo 8, 28040 Madrid, Spain
 
Physicochem. Probl. Miner. Process. 2018;54(3):771–780
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ABSTRACT
Copper flue dusts, or copper Cottrell dusts, from three types of copper smelting furnaces were leached with different ammonia-based reagents (ammonium chloride, ammonium carbonate and aqueous ammonia solutions) to dissolve the oxidised copper species via the formation of copper-ammonia complexes, so that most of the copper-accompanying metals, especially iron, remained in the solid residue. Such copper-bearing dusts are not only valuable secondary source of copper but also are considered as hazardous materials and cannot be dumped as such. Therefore, two procedures for copper dust treatment are proposed, one of them includes ammonium-based leaching, liquid-liquid extraction with LIX 860 (aldoxime), LIX 84 (ketoxime) or LIX 54 (β-diketone) and electrowinning to grade A copper cathode. The other one covers also ammonium-based leaching followed by cementation with zinc to copper cement as a final product.
 
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