Comparative study on chalcopyrite bioleaching with assistance of different carbon materials by mixed moderate thermophiles

Zhu, Ping; Liu, Xueduan; Chen, Aijia; Liu, Hongwei; Yin, Huaqun; Qiu, Guanzhou; Hao, Xiaodong; Liang, Yili

doi:10.1016/s1003-6326(19)65036-3

Cited by 10 publications

(2 citation statements)

References 41 publications

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“…However, it was found in this study that the precipitation of jarosite had little effect on the bioleaching process. As previously reported [42], jarosite presented as fluffy or woolly spherical particles, loosely packed in a porous structure on the surface, and a similar conclusion was reached by previous works [43,44]. It should be noted that, considering that the sterile control had no significant effect on the oxidation of DRGO, no analysis was conducted in the subsequent process.…”

Section: Mineralogical Composition Analysis By Xrdsupporting

confidence: 82%

Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg-Robbing of Gold from Thiourea Solution

Meng

et al. 2020

Metals

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Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a mixed culture containing Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans was investigated. The results showed that direct thiourea leaching of the as-received DRGO yielded only 28.7% gold extraction, which was due to the encapsulation of sulfides on gold and the gold adsorption of CM. After bio-oxidation, thiourea leaching of the DRGO resulted in gold extraction of over 75–80%. Moreover, bio-oxidation can effectively reduce the adsorption of carbon to gold. XRD, SEM-EDS and FTIR analysis showed that many oxygen-containing groups were introduced on the surface of DRGO during bio-oxidation, while the C=C bond was cleaved and the O–C–O and C–N bonds were degraded, causing a decrease in active sites for gold adsorption. Moreover, passivation materials such as jarosite were formed on the surface of DRGO, which might reduce the affinity of CM for gold in solutions. In addition, the cleavage of the S–S band indicated that sulfides were oxidized by bacteria. This work allows us to explain the applicability of pre-bio-oxidation for degrading both sulfides and CM and increasing gold recovery from DRGO in the thiourea system.

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Section: Mineralogical Composition Analysis By Xrdsupporting

confidence: 82%

Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg-Robbing of Gold from Thiourea Solution

Meng

et al. 2020

Metals

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“…Selain sulfur (S 0 ) dekomposisi CuFeS2 juga menghasilkan Cu dan Fe. (Zhu et al, 2019) melaporkan bahwa penambahan material karbon mampu memepercepat proses dekomposisi.…”

Section: Pembahasanunclassified

Isolation and Selection of Sulfuric Acid Bacteria from Kejayan River as Bio-oxidation Agents

Ulya

2022

JPBN

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Biooxidation method is connsidered more environmentally friendly and more economical to be able to overcome environmental problems polluted by metals. Sulfuric acid-producing bacteria is one of the biooxidizing agents, these bacteria can be isolated from acidic soil or acidic areas. The Kejayan Pasuruan River is drained by various industrial acidic wastes that contain metals. This study aims to obtain sulfuric acid-producing bacteria from the Kejayan river. Isolation and selection of sulfuric acid-producing bacteria from Kejayan river soil using thiosulfate medium. Pure isolates were obtained using the streak plate quadrant. In the biooxidation process using CuFeS2, sulfuric acid levels were measured using the turbidimetric method, the levels of [Cu] and [Fe] in the biooxidation medium were tested using AAS (Atomic Absorption Spectroscopy). K.2 isolate was selected as sulfuric acid producing bacteria with the highest sulfate concentration [SO42-] 13.9 ppm at 48 hours. These bacteria have the potential as biooxidizing agents for Cu and Fe metals.

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A Review on the Research of Hydrometallurgical Leaching of Low-Grade Complex Chalcopyrite

Liao

et al. 2022

J. Sustain. Metall.

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Comparative study on chalcopyrite bioleaching with assistance of different carbon materials by mixed moderate thermophiles

Cited by 10 publications

References 41 publications

Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg-Robbing of Gold from Thiourea Solution

Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg-Robbing of Gold from Thiourea Solution

Isolation and Selection of Sulfuric Acid Bacteria from Kejayan River as Bio-oxidation Agents

A Review on the Research of Hydrometallurgical Leaching of Low-Grade Complex Chalcopyrite

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