Sulfur composition on surface of chalcopyrite during its bioleaching at 50 °C

Wu, Shaohang; Yang, Congren; Qin, Wenqing; Jiao, Fen; Wang, Jun; Zhang, Yansheng

doi:10.1016/s1003-6326(15)64062-6

Cited by 32 publications

(21 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the challenges in this field has been how to bioleach valuable metal from low-grade ores, this has been the subject of numerous discussions around the world [135]. Due to the complexity of the mineral composition, especially in China, bioleaching mechanisms and interface reactions-such as pH value, ferrous transportation, EPS, quartz addition, and sulfur speciation, etc.-have been extensively studied [136][137][138][139][140][141][142]. Microorganism transportation, mechanisms, and reaction pathways of chalcopyrite, carrollite, and djurleite bioleaching [143,144]; synergistic bioleaching processes, like p-type chalcopyrite, n-type chalcopyrite, bornite [145,146]; and other low-grade resources have been analytically researched.…”

Section: Bioleaching Mechanism and Interface Reactionmentioning

confidence: 99%

Copper Bioleaching in China: Review and Prospect

et al. 2018

View full text Add to dashboard Cite

The commercial application of copper bioleaching, an environmentally-friendly approach for low-grade and secondary mineral resources recycling, has increased worldwide since the 2000s. As the world's second-largest economic entity and the largest developing country, China has the largest demand for metal resources, significantly advancing the theory and industrial technology of copper bioleaching. This paper reviews the exploration and application of copper bioleaching in China. Two typical bioleaching applications and technological processes, bioheap leaching at the Zijinshan Copper Mine and bioheap leaching at the Dexing Copper Mine, are introduced. The considerable research completed by researchers is summarized, especially focusing on the isolation and identification of leaching bacteria, the bioleaching mechanism and interface reactions, multistage percolation behavior, bioleaching system reconstruction, the multiphysics coupled model, and enhanced copper bioleaching from waste printed circuit boards (WPCBs). Based on this investigation in China, key trends and prospects in copper bioleaching-such as efficiency improvement, environmental protection, and improved technology applications-are proposed.

show abstract

Section: Bioleaching Mechanism and Interface Reactionmentioning

confidence: 99%

Copper Bioleaching in China: Review and Prospect

et al. 2018

View full text Add to dashboard Cite

show abstract

“…(1) Ag 2 S + 2Fe 3+ → 2Ag + + 2Fe 2+ + S 0 (2) S 2 2− and S n 2− were detected on surface leaching residues during the bioleaching time from 5 to 23 days, but the Cu extraction percentage still increased from 46% to 84% ( Figure 6H). In previous study, S 2 2− and S n 2− were considered as chalcopyrite passive film [7,11,12]. However, higher Cu extraction has been obtained in the presence of Ag.…”

Section: Discussionmentioning

confidence: 99%

“…Under the sterile control, 4.8% of the Cu and 5.1% of the Fe were leached from the chalcopyrite after 30 days (Figure 1a,b), and compared to chemical leaching, the extraction percentages of Cu and Fe for bioleaching of chalcopyrite were 21.5% and 17.0%, respectively. Simultaneously, the Fe extraction percentage decreased owing to the precipitation of Fe 3+ as jarosite after 24 days of bioleaching [7,50]. The pH of the solution changed slightly because only a small amount of chalcopyrite was leached either by chemically or microorganisms ( Figure 1c).…”

Section: Leaching Characteristicsmentioning

confidence: 99%

“…The mixed moderately thermophilic culture consisted of Sulfobacillus thermosulfidooxidans, together with a small amount of Acidithiobacillus caldus and Ferroplasma sp; this culture was an enrichment from a leaching solution sample at 50 • C, and was obtained from Inner Mongolia, China [7]. In each experiment, 2 g of sample was added into 250 mL flasks containing 100 mL of medium (components: 3.0 g/L (NH 4 ) 2 SO 4 , 0.5 g/L K 2 HPO 4 , 0.5 g/L MgSO 4 ·7H 2 O, 0.1 g/L KCl, 0.01 g/L Ca(NO 3 ) 2 , and 0.02% yeast extract, with a pH of 1.6).…”

Section: Bioleaching Experimentsmentioning

confidence: 99%

“…Chalcopyrite (CuFeS 2 ) is a primary copper resource worldwide [1,2], and hydrometallurgy of chalcopyrite has been attracting more and more research attention [3][4][5][6]. Chalcopyrite is difficult to be leached, though, owing to the passivation of the mineral surface [7][8][9][10], which contains S 2 2− [7,11], S n 2− [7,12], Cu 1−x Fe 1−y S 2−z [13,14], Cu 5 FeS 4 [13], CuS [13], CuS 2 [15], S 0 [11], and jarosite [11,16], all considered passivation composites. However, Crundwell et al [17] argued that the rate of chalcopyrite dissolution is intrinsically slow due to its semiconducting properties, and is not limited by passivation film.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Co-Bioleaching of Chalcopyrite and Silver-Bearing Bornite in a Mixed Moderately Thermophilic Culture

2017

Self Cite

View full text Add to dashboard Cite

Chalcopyrite and bornite are two important copper minerals, and they often coexist. In this study, the co-bioleaching of chalcopyrite and silver-bearing bornite by mixed moderately thermophilic culture at 50 • C was investigated. The bioleaching results show that the extraction percentage of Cu for co-bioleaching of chalcopyrite (Ccp) and silver-bearing bornite (Bn) (Ccp/Bn = 3:1) was 94.6%. Compared to bioleaching of chalcopyrite or silver-bearing bornite alone, the Cu extraction percentage was greatly enhanced when they were bioleached together. The leaching residues were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Silver-bearing bornite dissolved preferentially compared to chalcopyrite, due to galvanic interactions. Simultaneously, Ag + was released from the silver-bearing bornite into solution. Ag 2 S formed on the surface because Cu and Fe in the chalcopyrite were replaced by Ag + , accelerating chalcopyrite dissolution and enrichment of Ag on the surface of the chalcopyrite.Chalcopyrite and bornite are two important Cu-Fe-S minerals, and they often coexist [47][48][49]. The objective of this research was to investigate the co-bioleaching of chalcopyrite and silver-bearing bornite using a mixed moderately thermophilic culture at 50 • C. The leaching residues were characterized by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Materials and Methods Mineral SamplesThe chalcopyrite used in this study was obtained from Tonglvshan Mine, Daye, China. The bornite samples were purchased from GaoWanTong fossil specimen museum, Guilin, China. High-quality natural mineral samples were splintered into small fragments using a geological hammer, and then dry ground with porcelain ball milling. The particle size of the samples used for the bioleaching experiments was less than −0.074 mm. Chemical analysis of the samples showed that the chalcopyrite sample consisted of 33.91% Cu, 30.62% Fe, 32.90% S, 0.039% Pb, 0.018% Zn and 6.91 g/t Ag; and the bornite samples, of 62.38% Cu, 10.55% Fe, 22.60% S, 0.500% Pb, 0.048% Zn and 4635.48 g/t Ag. Aside from the special notes, all of the percentages (%) in this paper refer to weight percentage (wt %).

show abstract

Study on Selective Leaching of Copper and Simultaneous Precipitation of Iron in Polymetallic Complex Chalcopyrite by Hydrothermal Leaching Under Oxygen Pressure

Liao

et al. 2023

Metall Mater Trans B

View full text Add to dashboard Cite

Sulfur composition on surface of chalcopyrite during its bioleaching at 50 °C

Cited by 32 publications

References 48 publications

Copper Bioleaching in China: Review and Prospect

Copper Bioleaching in China: Review and Prospect

Co-Bioleaching of Chalcopyrite and Silver-Bearing Bornite in a Mixed Moderately Thermophilic Culture

Study on Selective Leaching of Copper and Simultaneous Precipitation of Iron in Polymetallic Complex Chalcopyrite by Hydrothermal Leaching Under Oxygen Pressure

Contact Info

Product

Resources

About