IMPROVEMENT OF SELECTIVE COPPER EXTRACTION FROM A HEAT-TREATED CHALCOPYRITE CONCENTRATE WITH ATMOSPHERIC SULPHURIC-ACID LEACHING

Küçük Resim Yok

Tarih

2016

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Inst Za Kovinske Materiale I In Tehnologie

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

The present work focuses on the extraction of Cu, suitable for production, directly from a leach solution of a chalcopyrite concentrate as an alternative to the conventional smelting and refining method. Firstly, the main aspects of the kinetics of chalcopyrite leaching in a sulphuric-acid solution and transformation reactions of chalcopyrite at high temperatures were briefly reviewed. Secondly, atmospheric-acid leaching experiments were performed as a function of the acid content and temperature under agitation. Direct leaching experiments resulted in very low and scattered Cu recoveries, hence revealing a sulphide passivation layer on the chalcopyrite. In order to get rid of this layer, the sulphides in the chalcopyrite were transformed into sulphates with heat treatment at 500 degrees C prior to the leaching process, in which a high dissolution of species was obtained. Finally, the leaching of the pre-heated concentrate resulted in a 99.82 % Cu extraction. Consequently, optimized process parameters were proposed by comparing the Cu extraction and the increased purity of the pregnant solution without Fe impurities.

Açıklama

Anahtar Kelimeler

chalcopyrite concentrate, leaching heat treatment, passivation layer, copper extraction, selectivity

Kaynak

Materiali in Tehnologije

WoS Q Değeri

Q4

Scopus Q Değeri

Q3

Cilt

50

Sayı

3

Künye