Intensified bioleaching of chalcopyrite concentrate using adapted mesophilic culture in continuous stirred tank reactors

You, Junhyuk; Solongo, Stephen Kayombo; Gomez-Flores, Allan; Choi, Sun‐Ho; Zhao, Hongbo; Urík, Martin

doi:10.1016/j.biortech.2020.123181

Cited by 41 publications

(12 citation statements)

References 41 publications

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“…Hence, technologies such as microbially driven metal leaching processes are used. Copper slag is subsequently produced as a byproduct which is solid waste and harmful to the environment but has the potential to yield viable metals if processed efficiently [3,4]. Waste management is one of the biggest challenges in the mining and processing industries, especially waste material such as copper slag.…”

Section: Introductionmentioning

confidence: 99%

Environmental and Socioeconomic Impact of Copper Slag—A Review

et al. 2021

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Copper slag is generated when copper and nickel ores are recovered from their parent ores using a pyrometallurgical process, and these ores usually contain other elements which include iron, cobalt, silica, and alumina. Slag is a major problem in the metallurgical industries as it is dumped into heaps which have accumulated into millions of tons over the years. Moreover, they pose a danger to the environment as they occupy vacant land (space problems). Over the past few years, studies have been conducted to investigate the copper slag-producing outlets to learn their behavior, as well as properties of slag, to have the knowledge of how to better reuse and recycle copper slag. This review article provides the environmental and socioeconomic impacts of slag, as well as a characterization of copper slag, with the aim of reusing and recycling the slag to benefit the environment and economy. Recycling methods are considered an attractive technological pathway for reducing waste and greenhouse gas emissions, as well as promoting the concept of circular economy through the utilization of waste. These metal elements have value depending on their characteristics; hence, copper slag is considered as a secondary source of valuable metals. Some of the pyrometallurgical and hydrometallurgical processes to consider are physical separation, magnetic separation, flotation, leaching, and direct reduction roasting of iron (DRI). Some of the possible metals that can be recovered from the copper slag include Cu, Fe, Ni, Co, and Ag (precious metals).

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Section: Introductionmentioning

confidence: 99%

Environmental and Socioeconomic Impact of Copper Slag—A Review

et al. 2021

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“…However, recent works mention that ferric ion plays twofold roles as an oxidizing representative and responsible for chalcopyrite passivation [21,22]. Various biological and chemical leaching processes have been developed to conquer the chalcopyrite passivation [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Synergistic effects of ferric sulfate addition and mechanical activation on leaching of Sarcheshmeh copper sulfide concentrate

Asl

Razavizadeh

2021

jcc

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In this paper, the leaching of a sulfide concentrate, from "Sarcheshmeh Copper Complex", by sulfuric acid is studied. The influences of sulfuric acid concentration and leaching temperature were scrutinized to optimize the processing parameters and to disclose the kinetics of the extraction process. The leaching rate of copper was not significantly improved with enhancing the temperature and concentration of sulfuric acid. The formation of elemental sulfur was found as a reducer of the leaching rate. Only ~70% of copper was extracted by adding 1M ferric sulfate as the oxidant agent, as well as increasing the leaching temperature up to 85 °C. By leaching the mechanically activated concentrate in Fe 2 (SO 4 ) 3 -doped H 2 SO 4 at 85 °C, the amount of extracted copper was ~90% after 180 min. The experimental results were excellently fitted with the diffusion-controlled kinetic model as the activation energy of ~27 kJ/mol was estimated.

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“…The role of microorganisms in the metals recycling from e-waste is still in its early stages. [15][16][17] However, the proven strength of biotechnology in metal extraction from primary minerals along with the continuous efforts for defining its role in recycling techniques have pushed to understand the pinpoints and bottlenecks for the wider application of microbial technology in e-waste recycling.…”

Section: Introductionmentioning

confidence: 99%

Biotechnological recycling of critical metals from waste printed circuit boards

Srivastava

Ilyas

Kim

et al. 2020

J of Chemical Tech & Biotech

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Critical metals are key raw materials for new generation clean energy production. The extraction of critical metals often follows the difficult processing of primary ores and they are many times recovered as the companion metals. With the depletion of primary reserves, the focus has now shifted to processing the urban mines, like electronic (e-)waste. Among the different types of e-waste, the waste printed circuit boards (WPCBs) are the major reservoir of high-value critical metals and are usually treated by the traditional pyro-and/or hydro-metallurgical techniques. However, the application of microbial activities in metals recycling is rapidly emerging as a green technology in comparison to smelter or chemical processing. The application of microorganisms (bacteria/fungi) in WPCBs' recycling is being increasingly explored in order to meet the parallel objectives of resource recovery and pollution mitigation. Therefore, the present article assesses the current frontiers in bioleaching of critical metals from WPCBs and contains discussions on process fundamentals, challenges, and perspectives. The applicability of microbial recycling of WPCBs at a higher scale in terms of a circular economy and urban mining notion, the techno-economic analysis, and environmental sustainability in comparison to the chemical processing route are also discussed.

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Intensified bioleaching of chalcopyrite concentrate using adapted mesophilic culture in continuous stirred tank reactors

Cited by 41 publications

References 41 publications

Environmental and Socioeconomic Impact of Copper Slag—A Review

Environmental and Socioeconomic Impact of Copper Slag—A Review

Synergistic effects of ferric sulfate addition and mechanical activation on leaching of Sarcheshmeh copper sulfide concentrate

Biotechnological recycling of critical metals from waste printed circuit boards

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