An XAS study of silver species evolution in silver-catalysed chalcopyrite bioleaching

Yang, Yi; Liu, Weihua; Gao, Xiyu; Chen, Miao

doi:10.1016/j.hydromet.2019.04.023

Cited by 15 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For these samples, a dampening of the near edge region and sharpening of the white line is observed. Such signatures are similar to what has been previously observed for AgCl, 35 suggesting that these samples contain some fractionation of ionized Ag + , and potentially as AgCl or an Ag/Cl-containing complex (see below). This is also substantiated by PXRD pattern of the 20 atomic % solution Ag NPs (Fig.…”

Section: Ag and Au Atomic Scale Coordinationsupporting

confidence: 83%

Mapping the effects of physical and chemical reduction parameters on local atomic distributions within bimetallic nanoparticles

et al. 2022

View full text Add to dashboard Cite

show abstract

Section: Ag and Au Atomic Scale Coordinationsupporting

confidence: 83%

Mapping the effects of physical and chemical reduction parameters on local atomic distributions within bimetallic nanoparticles

et al. 2022

View full text Add to dashboard Cite

show abstract

“…After that, the ORP in column 2# maintained beyond 450 mV, while that in column 1# decreased quickly in 30 days and maintained below 450 mV after day 91. It was reported that low ORP can alleviate the formation of passivation layer such as jarosite and facilitate the bioleaching of chalcopyrite (Johnson, 2014;Yang et al, 2019). As a result, the copper ion accumulation of column 1# increased much faster than that of column 2# (Fig.…”

Section: Variation Of Iron Ion and Orp During The Chalcopyrite Biolea...mentioning

confidence: 92%

Copper extraction from low-grade chalcopyrite in a bioleaching column assisted by bioelectrochemical system

Zhang

Huang

et al. 2022

Environ Sci Pollut Res

View full text Add to dashboard Cite

Low-grade ores, tailings and solid wastes contain small amounts of valuable heavy metals. Improper disposal of these results in the waste of resources and contamination of soil or groundwater. Accordingly, the treatment and recycling of low-grade ores, tailings and solid wastes attracted much attention recently.Bioelectrochemical system, an innovative technology for the removal and recovery of heavy metals, has been further developed and applied in recent years. In current study, the low-grade chalcopyrite was bioleached with the assistance of microbial fuel cells. Copper extraction along with electricity generation from the low-grade chalcopyrite were achieved in the column bioleaching process assisted by MFCs. Results showed that after 197 days bioleaching of low-grade chalcopyrite, 423.9 mg copper was extracted from 200 g low-grade chalcopyrite and the average coulomb production reached 1.75 C/d. The introduction of MFCs into bioleaching processes promoted the copper extraction e ciency by 2.7 times (3.62% vs. 1.33%), mainly via promoting ferrous oxidation, reducing ORP and stimulating bacterial growth. This work provides a feasible method for the treatment and recycling of low-grade ores, tailings and solid wastes. But balancing energy consumption of aeration and circulation frequency and chemicals consumption of acid to improve the copper extraction e ciency need further investigation.

show abstract

“…Recently years, Ag + has received attention due to its recoverability and efficient catalysis in mineral bioleaching [21]. The role of Ag + in the chalcopyrite bioleaching still remains controversial because the reaction on mineral surface with the participation of Ag + is complex.…”

Section: Metal Ion (Ferric Copper and Silver) Additionmentioning

confidence: 99%

Research progress in intensified bioleaching of chalcopyrite: A review

Xuemin¹,

Zhang²,

Zhou³

et al. 2022

HSET

View full text Add to dashboard Cite

Chalcopyrite (CuFeS2) as one of the most abundant copper sulfide minerals, is refractory to conventional hydrometallurgical and pyrometallurgical processes. Bioleaching is a practice of extracting valuable metals by using acidophilic bacteria to catalyse the dissolution of sulfide/iron-containing ores. It has been widely adopted in copper ores processing due to environmental and economic performance over the conventional methods, especially its use in low-grade sulfide minerals. To date, low copper extraction is a common problem during chalcopyrite bioleaching, which limits its industrial application. Hence, it is of particular importance to find methods to enhance the leaching rate. Chalcopyrite dissolution is a complex process with the participation of microorganisms, minerals and gas and liquid phases. All these physicochemical, microbiological, mineralogical and processing parameters have influences on the rate and efficiency at which bioleaching proceeds. High copper yield can be achieved by optimizing leaching conditions in an optimum range. A number of researches has been conducted to explore the influence of leaching parameters on bioleaching rate. This review intends to briefly describe the effect of some parameters on the bioleaching of chalcopyrite. And it lays the emphasis on the presentation of methods to promote the efficiency of bioleaching and the strengthening mechanisms.

show abstract

An XAS study of silver species evolution in silver-catalysed chalcopyrite bioleaching

Cited by 15 publications

References 35 publications

Mapping the effects of physical and chemical reduction parameters on local atomic distributions within bimetallic nanoparticles

Mapping the effects of physical and chemical reduction parameters on local atomic distributions within bimetallic nanoparticles

Copper extraction from low-grade chalcopyrite in a bioleaching column assisted by bioelectrochemical system

Research progress in intensified bioleaching of chalcopyrite: A review

Contact Info

Product

Resources

About