Effect of carbonaceous matter on bioleaching of Cu from chalcopyrite ore

Kojo T. Konadu; Ryotaro Sakai; Diego M. Mendoza; Chitiphon Chuaicham; Hajime Miki; Keiko Sasaki

doi:10.1016/j.hydromet.2020.105363

Effect of carbonaceous matter on bioleaching of Cu from chalcopyrite ore

Kojo T. Konadu, Ryotaro Sakai, Diego M. Mendoza, Chitiphon Chuaicham, Hajime Miki, Keiko Sasaki

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Natural carbonaceous matter aided the bioleaching of Cu from chalcopyrite concentrates. The oxidative dissolution of chalcopyrite was enhanced more significantly by anthracite than carbonaceous matter in double refractory gold ore (DRGO). This was achieved through Galvanic interactions between the chalcopyrite and natural carbonaceous matter. Measurement of impedance verified that the electro-resistance is smaller in anthracite, which has a greater graphitic degree than carbonaceous matter in DRGO. The electron shuttle between chalcopyrite and the Fe³⁺ /Fe²⁺ redox couple was facilitated not only by the amounts of carbonaceous matter but also the degree of graphitization of carbonaceous matter. A higher graphitization degree increased the electron conductivity of the carbonaceous matter to help mediate Cu bioleaching while avoiding direct contact of thermophile cells with refractory copper sulfides.

Original language	English
Article number	105363
Journal	Hydrometallurgy
Volume	195
DOIs	https://doi.org/10.1016/j.hydromet.2020.105363
Publication status	Published - Aug 2020

All Science Journal Classification (ASJC) codes

Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.hydromet.2020.105363

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@article{2435c64c92414add8d578fd2adfd8b43,

title = "Effect of carbonaceous matter on bioleaching of Cu from chalcopyrite ore",

abstract = "Natural carbonaceous matter aided the bioleaching of Cu from chalcopyrite concentrates. The oxidative dissolution of chalcopyrite was enhanced more significantly by anthracite than carbonaceous matter in double refractory gold ore (DRGO). This was achieved through Galvanic interactions between the chalcopyrite and natural carbonaceous matter. Measurement of impedance verified that the electro-resistance is smaller in anthracite, which has a greater graphitic degree than carbonaceous matter in DRGO. The electron shuttle between chalcopyrite and the Fe3+ /Fe2+ redox couple was facilitated not only by the amounts of carbonaceous matter but also the degree of graphitization of carbonaceous matter. A higher graphitization degree increased the electron conductivity of the carbonaceous matter to help mediate Cu bioleaching while avoiding direct contact of thermophile cells with refractory copper sulfides.",

author = "Konadu, {Kojo T.} and Ryotaro Sakai and Mendoza, {Diego M.} and Chitiphon Chuaicham and Hajime Miki and Keiko Sasaki",

note = "Funding Information: We appreciate the financial supports of JSPS KAKENHI JP18J10835 , JP18K19045 , JSPS-NRF Bilateral Program JPJSBP 120196505 , and Core-to-Core Program which were provided to KS. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

month = aug,

doi = "10.1016/j.hydromet.2020.105363",

language = "English",

volume = "195",

journal = "Hydrometallurgy",

issn = "0304-386X",

publisher = "Elsevier",

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T1 - Effect of carbonaceous matter on bioleaching of Cu from chalcopyrite ore

AU - Konadu, Kojo T.

AU - Sakai, Ryotaro

AU - Mendoza, Diego M.

AU - Chuaicham, Chitiphon

AU - Miki, Hajime

AU - Sasaki, Keiko

N1 - Funding Information: We appreciate the financial supports of JSPS KAKENHI JP18J10835 , JP18K19045 , JSPS-NRF Bilateral Program JPJSBP 120196505 , and Core-to-Core Program which were provided to KS. Publisher Copyright: © 2020 Elsevier B.V.

PY - 2020/8

Y1 - 2020/8

N2 - Natural carbonaceous matter aided the bioleaching of Cu from chalcopyrite concentrates. The oxidative dissolution of chalcopyrite was enhanced more significantly by anthracite than carbonaceous matter in double refractory gold ore (DRGO). This was achieved through Galvanic interactions between the chalcopyrite and natural carbonaceous matter. Measurement of impedance verified that the electro-resistance is smaller in anthracite, which has a greater graphitic degree than carbonaceous matter in DRGO. The electron shuttle between chalcopyrite and the Fe3+ /Fe2+ redox couple was facilitated not only by the amounts of carbonaceous matter but also the degree of graphitization of carbonaceous matter. A higher graphitization degree increased the electron conductivity of the carbonaceous matter to help mediate Cu bioleaching while avoiding direct contact of thermophile cells with refractory copper sulfides.

AB - Natural carbonaceous matter aided the bioleaching of Cu from chalcopyrite concentrates. The oxidative dissolution of chalcopyrite was enhanced more significantly by anthracite than carbonaceous matter in double refractory gold ore (DRGO). This was achieved through Galvanic interactions between the chalcopyrite and natural carbonaceous matter. Measurement of impedance verified that the electro-resistance is smaller in anthracite, which has a greater graphitic degree than carbonaceous matter in DRGO. The electron shuttle between chalcopyrite and the Fe3+ /Fe2+ redox couple was facilitated not only by the amounts of carbonaceous matter but also the degree of graphitization of carbonaceous matter. A higher graphitization degree increased the electron conductivity of the carbonaceous matter to help mediate Cu bioleaching while avoiding direct contact of thermophile cells with refractory copper sulfides.

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U2 - 10.1016/j.hydromet.2020.105363

DO - 10.1016/j.hydromet.2020.105363

M3 - Article

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SN - 0304-386X

VL - 195

JO - Hydrometallurgy

JF - Hydrometallurgy

M1 - 105363

ER -

Effect of carbonaceous matter on bioleaching of Cu from chalcopyrite ore

Abstract

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