Recovery of Copper from ore dump using bioleaching approach

Bioleaching is an environmentally-friendly approach for the extraction of useful metals from low-grade ores and secondary mineral materials. The object of this paper was to examine the possibility of microbiological solubilisation of copper from ore dump by Acidithiobacillus sp. B2. Leaching experiments were performed by the shake flask testing technique at 28 oC, during two-week period. The percentage of the copper leached at the end of this experiment was 31%

Bioleaching of zinc from a polymetallic ore flotation concentrate by Acidithiobacillus ferrooxidans

Cilj našeg eksperimenta je bio da ispita potencijal Acidithiobacillus ferrooxidans za ekstrakciju cinka iz fotacionog koncentrata polimetalične rude ležišta Rudnik (Srbija)

Biohydrometallurgical Methods for Cobal and Nickel Recovery from Printed PC Motherboard

Poster presented at: The 22nd European Meeting on Environmental Chemistry (EMEC 22), 5 - 8 December,2022, Ljubljana, SloveniaAbstract: [https://cer.ihtm.bg.ac.rs/handle/123456789/5459

Biohydrometallurgical Methods for Cobal and Nickel Recovery from Printed PC Motherboard

E-waste is one of the fastest growing waste. Ewaste contains lots of valuable resources together with plenty of heavy metals and hazardous materials, which are considered both an attractive polymetallic secondary source and an environmental contaminant. Therefore, recycle of valuable metallic from them are necessary and compulsory in many developed/developing countries. The aim of our study was to investigate the potential of using the Acidithiobacillus sp. B2, to recovery Co and Ni from printed PC motherboard.Poster: [https://cer.ihtm.bg.ac.rs/handle/123456789/5460

Microbial solubilization of copper and zinc from polymetallic sulphide ore

The object of this study was to investigate the possibility of copper and zinc leaching from polymetallic sulphide ore from the Bobija deposit (Western Serbia) by Acidithiobacillus sp.B2. Iron-oxidizing Acidithiobacillus sp. B2 was isolated from copper sulphide mine wastewater (Lake Robule) in Bor, Serbia. The bacterium was identified by 16SrDNA oligonuckotide sequence. Leaching experiment by the shake flask testing technique was performed during a period of four weeks ata temperature of 28 °C. The percentage of Cu and Zn leached at the end of this experiment was 65% and 67% respectively. This study shows that iron-oxidizing Acidithiobacillus sp. B2 can have a very important role in the extraction of copper and zinc, from polymetallic sulphide ore from the Bobija deposit

Two-stage process for extraction useful metals from a polymetallic ore flotation concentrate: A laboratory study

Reserves of rich ore, from which it is technologically possible and economically feasible to obtain metals, mainly by pyrometallurgical processes, are reducing from year to year. At the same time, intensive, world-wide development of technology is causing higher metal consumption, which has resulted in multiple increases of metal prices in recent years. Study of new procedures for usage of low-grade metal ores (e.g. Cu and Zn), while also respecting rigorous environmental regulations, are considered current problems of extractive metallurgy in developed countries. Some of these ores are polymetallic ores. Therefore, increasing efforts are being made to develop new hydrometallurgical and biohydrometallurgical procedures that are more selective than conventional ones and which would enable successful processing of this kind of raw material. [1] The aim of this study was to investigate the possibility of applying Acidithiobacillus sp. B2 to obtain copper, zinc and gold from a polymetallic ore flotation concentrate. The study was designed in two phases

Flotation Concentrations of Polymetallic Sulfides from Serbian Ore Deposits as Biohydrometalurgical Substrates: Laboratory Tests

There are three ore deposits of polymetallic sulfide ores that are of economic value in Serbia. Only ore deposit "A" (in central part of Serbia) is mine in exploitation (underground and surface), including and floatation plant. Dominant ore minerals at deposit "A" are: galena, sphalerite and chalcopyrite, with accompanying pyrrhotite, and some arsenopyrite. Lead, zinc and copper concentrates are obtained in particular. Approximately three million tons of reserves have been confirmed at deposit "A". About one million tons of reserves have been confirmed at ore deposit "B", which is located in Eastern Serbia. Important ore minerals at this deposit are: chalcopyrite, enargite, sphalerite and galena. Accompanying mineral is pyrite including pyrrhotite. Ore deposit "C" is located in Western Serbia, and has confirmed reserves of more than one million tons. Galena (with some anglesite), sphalerite and tetrahedrite are dominant ore minerals, and pyrite as accompanying mineral. Ore deposit "C" has legitimately exploitative amounts of industrial mineral barite. All three sites have significant amounts of silver, while deposit "B" has gold as well. This paper presents preliminary results of bacterial leaching of flotation concentrates from afore mentioned ore deposits obtained by shake flask test technique during four weeks, with pure culture of acidophilic and mezophilic allochthonous strain of the Aciditihiobacillus sp. B2 (the isolate was identified using the EzTaxon server on the basis of 16S rRNA sequence data). Deposit "A" was tested, in this investigation step, only for copper concentrate while other two deposits were examined polymetallic bulk concentrates (obtained in pilot flotation plants).Poster: [https://cer.ihtm.bg.ac.rs/handle/123456789/5536

Flotation Concentrations of Polymetallic Sulfides from Serbian Ore Deposits as Biohydrometalurgical Substrates: Laboratory Tests

There are three ore deposits of polymetallic sulfide ores that are of economic value in Serbia. Only ore deposit "A" (in central part of Serbia) is mine in exploitation (underground and surface), including and floatation plant. Dominant ore minerals at deposit "A" are: galena, sphalerite and chalcopyrite, with accompanying pyrrhotite, and some arsenopyrite. Lead, zinc and copper concentrates are obtained in particular. Approximately three million tons of reserves have been confirmed at deposit "A". About one million tons of reserves have been confirmed at ore deposit "B", which is located in Eastern Serbia. Important ore minerals at this deposit are: chalcopyrite, enargite, sphalerite and galena. Accompanying mineral is pyrite including pyrrhotite. Ore deposit "C" is located in Western Serbia, and has confirmed reserves of more than one million tons. Galena (with some anglesite), sphalerite and tetrahedrite are dominant ore minerals, and pyrite as accompanying mineral. Ore deposit "C" has legitimately exploitative amounts of industrial mineral barite. All three sites have significant amounts of silver, while deposit "B" has gold as well. This paper presents preliminary results of bacterial leaching of flotation concentrates from afore mentioned ore deposits obtained by shake flask test technique during four weeks, with pure culture of acidophilic and mezophilic allochthonous strain of the Aciditihiobacillus sp. B2 (the isolate was identified using the EzTaxon server on the basis of 16S rRNA sequence data). Deposit "A" was tested, in this investigation step, only for copper concentrate while other two deposits were examined polymetallic bulk concentrates (obtained in pilot flotation plants).Abstract: [https://cer.ihtm.bg.ac.rs/handle/123456789/5535]Poster presented at: 21st International Biohydrometallurgy Symposium (IBS 2015

Revealing the effects of cerium dioxide nanoparticles through the analysis of morphological changes in CHIRONOMUS RIPARIUS

Due to their many practical applications, engineered cerium dioxide (CeO2) nanoparticles (NPs) are commonly used today, although there are justified concerns about the environmental risks of their usage. Studies to date have shown that CeO2 NPs do not pose a lethal hazard to hydrobiocenoses at environmentally relevant concentrations, but that they induce significant negative sublethal effects. Therefore, intensive work is being done on the adaptation of standard ecotoxicological tests with the development of new, sublethal biomarkers. The present study aims to examine the sublethal effects of prolonged exposure to CeO2 NPs (2.5; 25; 250 and 2500 mg of CeO2 NPs per 1 kg of sediment) on the morphological features of the non-biting aquatic midge Chironomus riparius. Morphological variation was examined by means of two approaches: (1) Deformity rate analysis (analysis of visible morphological malformations) and (2) Geometric morphometric analysis (analysis of differences in the size and shape of the larval mandibles and mentums, as well as adult male and female wings). Changes in all the morphological structures examined were observed using a geometric morphometric approach at low and very high concentrations of CeO2 NPs (2.5 and 2500 mg of CeO2 NPs per 1 kg of sediment). The potential reduction of sexual dimorphism resulting from downsizing of the wings in females was observed. These results indicate that the sublethal changes observed in chironomids exposed to CeO2 NPs are significant and may potentially lead to further changes in metabolism, diet and behavior, which may lead to repercussions of as yet unexamined proportions. Considering our findings, and the advantages of geometric morphometrics (precision, uniformity, accurate qualification, quantification, and visualization of fine morphological changes), this approach is proven to be an exceptional assessment tool, with great applicative potential in the ecotoxicological testing of nanoparticles.This is a manuscript of an article published as Savić-Zdravković, Dimitrija, Djuradj Milošević, Jelena Conić, Katarina Marković, Janez Ščančar, Marko Miliša, and Boris Jovanović. "Revealing the effects of cerium dioxide nanoparticles through the analysis of morphological changes in CHIRONOMUS RIPARIUS." Science of The Total Environment (2021): 147439. doi:10.1016/j.scitotenv.2021.147439. Posted with permission.</p

Revealing the effects of cerium dioxide nanoparticles through the analysis of morphological changes in CHIRONOMUS RIPARIUS

Due to their many practical applications, engineered cerium dioxide (CeO2) nanoparticles (NPs) are commonly used today, although there are justified concerns about the environmental risks of their usage. Studies to date have shown that CeO2 NPs do not pose a lethal hazard to hydrobiocenoses at environmentally relevant concentrations, but that they induce significant negative sublethal effects. Therefore, intensive work is being done on the adaptation of standard ecotoxicological tests with the development of new, sublethal biomarkers. The present study aims to examine the sublethal effects of prolonged exposure to CeO2 NPs (2.5; 25; 250 and 2500 mg of CeO2 NPs per 1 kg of sediment) on the morphological features of the non-biting aquatic midge Chironomus riparius. Morphological variation was examined by means of two approaches: (1) Deformity rate analysis (analysis of visible morphological malformations) and (2) Geometric morphometric analysis (analysis of differences in the size and shape of the larval mandibles and mentums, as well as adult male and female wings). Changes in all the morphological structures examined were observed using a geometric morphometric approach at low and very high concentrations of CeO2 NPs (2.5 and 2500 mg of CeO2 NPs per 1 kg of sediment). The potential reduction of sexual dimorphism resulting from downsizing of the wings in females was observed. These results indicate that the sublethal changes observed in chironomids exposed to CeO2 NPs are significant and may potentially lead to further changes in metabolism, diet and behavior, which may lead to repercussions of as yet unexamined proportions. Considering our findings, and the advantages of geometric morphometrics (precision, uniformity, accurate qualification, quantification, and visualization of fine morphological changes), this approach is proven to be an exceptional assessment tool, with great applicative potential in the ecotoxicological testing of nanoparticles