title: Effects of pyrite and bornite on bioleaching of two different types of chalcopyrite in the presence of Leptospirillum ferriphilum.
abstract: The effects of pyrite and bornite on bioleaching of two different chalcopyrite samples by Leptospirillum ferriphilum were studied for the first time. Results showed that bioleaching behaviors of the two chalcopyrite samples were extremely different. Bornite decreased the redox potential (ORP) and maintained it at an appropriate range (380-480 mV vs. Ag/AgCl) to promote chalcopyrite (A) dissolution, but caused the redox potential out of the optimum range and inhibited chalcopyrite (B) dissolution. Large amount of pyrite decreased the redox potential and maintained it at an optimum range to promote chalcopyrite (A) dissolution, while increased the redox potential and kept it at appropriate range for a longer period of time to enhance the dissolution rate of chalcopyrite (B). Chalcopyrite (B) had significantly higher values of conductivity and oxidation-reduction rate when compared with those of chalcopyrite (A). The work is potentially useful in interpreting the inconsistence of the researches of chalcopyrite hydrometallurgy.
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhao
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China. Electronic address: wjwq2000@126.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China.
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Gan
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China.
authors.forename: Xihua
authors.initials: X
authors.lastname: Zheng
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China.
authors.forename: Lang
authors.initials: L
authors.lastname: Tao
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China.
authors.forename: Minghao
authors.initials: M
authors.lastname: Hu
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China.
authors.forename: Yini
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China.
authors.forename: Wenqing
authors.initials: W
authors.lastname: Qin
authors.affiliation: School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China; Key Lab of Bio-hydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China.
authors.forename: Guanzhou
authors.initials: G
authors.lastname: Qiu
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D003300:Copper / Q000737:chemistry* / Q000378:metabolism*; D005296:Ferrous Compounds / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008669:Metallurgy / Q000379:methods*; D010084:Oxidation-Reduction; D013440:Sulfides / Q000737:chemistry*
chemical_list: D005296:Ferrous Compounds; D013440:Sulfides; C550757:bornite; C012819:chalcopyrite; C011342:pyrite; D003300:Copper; D007501:Iron
keywords: Bioleaching; Bornite; Chalcopyrite; Leptospirillum ferriphilum; Pyrite