Mechanism of bioleaching of coal fly ash by Thiobacillus thiooxidans

Seidel, Alexander; Zimmels, Y.; Armon, Robert

doi:10.1016/s1385-8947(00)00256-4

Cited by 74 publications

(30 citation statements)

References 23 publications

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“…3), rendering the metal soluble [9] Increasing the liquid:solid ratio increases the solubility of CaSO 4 in acid, thus exposing the underlying aluminum to the acid for further dissolution. Their findings confirmed earlier results by Seidel and Zimmels [13] who also achieved poor alumina extraction at low acid concentration. In both cases, the researchers also further attributed this phenomenon to the fact that aluminum in CFA exists in two different phases, namely, the amorphous non-crystalline phase and the crystalline and refractory mullite phase.…”

Section: Direct Acid Leachingsupporting

confidence: 91%

“…In a related study, Seidel et al [13] investigated the effects of CFA composition on the growth of bacterial load and subsequent bioleaching of Al and Fe. The CFA was pre-treated with HCl in order to get rid of CaO, and therefore, inhibit the formation of undesirable CaSO 4 [13].…”

Section: Bioleachingmentioning

confidence: 99%

“…The CFA was pre-treated with HCl in order to get rid of CaO, and therefore, inhibit the formation of undesirable CaSO 4 [13]. Aluminum extraction of about 25 % was achieved over a 3-week leaching period.…”

Section: Bioleachingmentioning

confidence: 99%

“…Low-extraction efficiency Slow kinetics [13] It has been postulated by Charlot [39] that impurities of Ti 4? , Fe 3?…”

Section: Up To 25mentioning

confidence: 99%

“…Amenability of CFA to different forms of leaching for aluminum recovery has been successfully demonstrated in concept by a number of workers including sulfuric acid leaching [21,22,9], nitric acid leaching [10], alternate alkaline (other than NaOH) leaching [11], and bioleaching [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

Sibanda

Ndlovu

Dombo

et al. 2016

J. Sustain. Metall.

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The major commercial technology for the production of smelter grade alumina has conventionally been the Bayer process which converts bauxite ore, an aluminum containing ore which typically contains about 50 % Al 2 O 3 , into smelter grade alumina that contains over 99.0 % Al 2 O 3 . Another potential source of aluminum that is receiving renewed attention is coal fly ash (CFA), which is a by-product of coal combustion during electricity generation in power stations. Most coal fly ash found around the world contain typically between 25 and 35 % Al 2 O 3 , which is substantial to make CFA a potential alternative source of alumina. There has been some considerable research effort, in the last two decades, aimed at extracting aluminum from this semi-waste product. Much emphasis from the different workers has been on the leaching of the contained aluminum, while the purification and recovery of alumina from the liquor solution has received less attention. Notwithstanding that several patents on the processes to recover alumina from CFA exist, limited commercialisation of the processes has been reported. This paper seeks to review and discuss the hydrometallurgical extraction processes that have been formulated and tested by different workers and then assesses the available opportunities and the way forward on the prospects of commercially extracting alumina and other valuable components from this abundant resource.

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Section: Direct Acid Leachingsupporting

confidence: 91%

Section: Bioleachingmentioning

confidence: 99%

Section: Bioleachingmentioning

confidence: 99%

“…Low-extraction efficiency Slow kinetics [13] It has been postulated by Charlot [39] that impurities of Ti 4? , Fe 3?…”

Section: Up To 25mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

Sibanda

Ndlovu

Dombo

et al. 2016

J. Sustain. Metall.

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Immobilization of Acidithiobacillus ferrooxidans on cotton gauze for biological oxidation of ferrous ions in a batch bioreactor

Zhu

Shi

Shang

et al. 2017

Biotech and App Biochem

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The ability of Acidithiobacillus ferrooxidans to oxidize ferrous iron has been extensively studied in bioleaching to recover metal resources. Although immobilization of A. ferrooxidans is of great importance to achieve high bioleaching performance in practical application, the reported approaches of immobilization of A. ferrooxidans are still limited. This paper is attempting to develop a novel method to immobilize A. ferrooxidans by a less-costly effective carrier from zeolite, activated carbon, and cotton gauze. The results showed that cotton gauze was the most suitable carrier to immobilize A. ferrooxidans cells in comparison with zeolite and activated carbon. Acidithiobacillus ferrooxidans immobilized on the cotton gauze by gravity dehydration could achieve an average ferrous iron oxidation rate of 0.73 g/(L·h). Furthermore, the ferrous iron oxidation ratio attained in the bioreactor under batch operation was maintained above 97.83%. All results indicated that cotton gauze could be an efficient carrier for immobilizing A. ferrooxidans cells for the biooxidation of ferrous ions.

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The effects of metabolites from the indigenous Acidithiobacillus thiooxidans and temperature on the bioleaching of cadmium from soil

Liu

Chiu²,

Cheng³

2003

Biotech & Bioengineering

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Abstract:The effect of metabolites from the indigenous Acidithiobacillus thiooxidans and temperature on the bioleaching of cadmium from soil was investigated in the present study. Bioleaching was found to be more effective than chemical leaching of cadmium. The metabolite, mainly sulfuric acid, which was shown to be growthassociated in the exponential phase, plays a major role in bioleaching. The maximum amount of cadmium leached was obtained after 8 days of precultivation when cells were directly involved in the leaching process. It indicates that cells in the exponential growth phase exhibit higher activity toward bioleaching. In contrast, the maximum amount of cadmium leached and the maximum initial rate for bioleaching were reached after 16 days of precultivation when only metabolites were involved in the bioleaching process. It implies that higher sulfuric acid concentration results in higher leaching efficiency. In addition, higher temperature leads to higher leaching efficiency. The optimal operation condition for bioleaching was determined to be a two-stage process: The first stage involves the precultivation of the indigenous A. thiooxidans at 30°C for 8 days followed by 20 minutes of centrifugation to discard cells. The second stage involves the bioleaching with the subsequent supernatant at 50°C.

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Mechanism of bioleaching of coal fly ash by Thiobacillus thiooxidans

Cited by 74 publications

References 23 publications

Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

Immobilization of Acidithiobacillus ferrooxidans on cotton gauze for biological oxidation of ferrous ions in a batch bioreactor

The effects of metabolites from the indigenous Acidithiobacillus thiooxidans and temperature on the bioleaching of cadmium from soil

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