PDF Bioleaching: A microbial process of metal recovery; …Bioleaching microbial leaching being an economical and environmental friendly process is investigated extensively for metal extraction from secondary solid wastes viz. electronic wastes
PDF Chemical oxidation integrated into bioleaching of …Chemical oxidation integrated into bioleaching of p yrite and chalcop yrite using immobil ized biomass Fig. 4. Rate of generation of Fe 2 during chemical oxidati on of pyrite at dif ferent pulp
Bioleaching of Zn from sphalerite using Leptospirillum …De Souza AD Pina PS Le& 227;o VA 2007 Bioleaching and chemical leaching as an integrated process in the zinc industry. Miner Eng 20:591–599 Google Scholar
Leaching chemistry - WikipediaLeaching can occur naturally seen from plant substances inorganic and organic solute leaching in soil and in the decomposition of organic materials. Leaching can also be applied affectedly to enhance water quality and contaminant removal 1 6 as well as for disposal of hazardous waste products such as fly ash 7 or rare earth elements REEs . 8
An integrated sequential biological leaching process for …10/1/2015& 0183;& 32;The use of a two-stage sequential process for decoked spent alyst and involving bioleaching–bioleaching or bioleaching followed by chemical leaching has not been previously reported. In the present study several two-stage sequential leaching strategies were tested in order to test their effectiveness in achieving high metal leaching yield from the decoked spent alyst.Cited by: 14
Sphalerite bioleaching comparison in shake flasks and …1/3/2019& 0183;& 32;Chemical data for sphalerite-ore bioleaching and chemical leaching experiments Time-resolved chemical data are shown for three of six bioleaching and chemical leaching experiments for shake flasks in Fig. 1 for percolators in Fig. 2 and for shake flasks with an initial addition of …Cited by: 2
PDF Enhanced uranium bioleaching high-fluorine and …A 4854-ton plant-scale heap bioleaching process achieved sustained leaching with a uranium leaching efficiency of 88.3% using a pH of 1.0–2.0 and an Fe& 179;⁺ dosage of 3.0–5.5 g/L. Acid
Bioleaching of Zinc and Iron from Steel Plant Waste using …The bacterial leaching of zinc and iron from solid wastes at the Isdemir iron and steel plant has been investigated using Acidithiobacillus ferrooxidans as the bacterial agent. The effects of a range of operational parameters including particle size solids concentration and pH on the efficiency of the bioleaching process were investigated.
Minerals Free Full-Text Mechanism for the Bio-Oxidation …This work investigated the effects of Fe3 H and adsorbed leaching bacteria on the bioleaching of pentlandite. Collectively an integrated model for the oxidation and decomposition of pentlandite was built to describe the behaviors of different components in a bioleaching system. Proton ions and ferric ions could promote the break and oxidation of Ni-S and Fe-S bonds. The iron-oxidizing
Sulfur speciation transformation during bioleaching of …1/7/2012& 0183;& 32;de SOUZA A D PINA P S LEAO V A. Bioleaching and chemical leaching as an integrated process in the zinc industry J . Minerals Engineering 2007 20 6 : 591–599. Article Google Scholar HOANG J REUTER M A MATUSEWICZ R HUGHES S PIRET NCited by: 5
Bioleaching and chemical leaching as an integrated process in the …& 0183;& 32;Bioleaching and chemical leaching as an integrated process in the zinc industry Adelson D. de Souza a Pablo S. Pina b Versiane Albis Lea˜o b* a Votorantim Metais Zinc – Technologies Development Centre BR 040 Km 274-Treˆs Marias MG 39205-000 Brazil b Universidade Federal de Ouro Preto Department of Metallurgical and Materials Engineering Nu& 180;cleo de Valorizac& 184;a˜o de Materiais
Minerals Free Full-Text Co-Bioleaching of Chalcopyrite …During the bioleaching of chalcopyrite Fe 2 in the solution was oxidized to Fe 3 by ferrous oxidizing microbials and thus redox potentials rose and stabilized at about 630 mV while the redox potentials of chemical leaching stabilized at about 370 mV Figure 1
Comparison of bioleaching behaviors of different …31/3/2009& 0183;& 32;Souza AD Pina PS Leao VA 2007 Bioleaching and chemical leaching as an integrated process in the zinc industry. Miner Eng 20:591–599. doi: …
An integrated approach combines hydrothermal chemical …In one-step bioleaching method the maximum leaching rate of Ni reached up to 78.6% 0.630 mg/L with HAKT and 48.8% 0.391 mg/L with HTAT. The leaching rate of the alkali-treated fly ash in the two-step leaching method was also significantly higher thanAuthor: HaiFeng Su Furong Tan JiaFu Lin
Bioleaching and chemical leaching as an integrated process …1/5/2007& 0183;& 32;Considering bioleaching and chemical leaching as integrated processes the overall leaching time is reduced as compared to that observed by Pani et al. 2003 for the complete bioleaching of ZnS; nevertheless the residence time is still relatively large.Cited by: 58
Bioleaching and chemical leaching as an integrated process …Abstract This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate assaying 51.4% Zn 1.9% Pb 31.8% S and 9.0% Fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the bioleaching residue were assessed. In the bioleaching step the first reactor
Bioleaching and chemical leaching as an integrated process …The continuous bioleaching of a sphalerite concentrate assaying 51.4% Zn 1.9% Pb 31.8% S and 9.0% Fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the
TWO STAGE LEACHING PROCESS FOR Cu AND Zn RECOVERY …& 0183;& 32;during the leaching so that at the end of the acid leaching process pH value was 1.4 Figure 1 – Figure 2 Cu Zn and Fe recovery vs. time with pulp density of 10% w/v –Combination of the bioleaching and chemical leaching with the air addition By chemical
Flow Behaviour and Mass Transfer Simulation during Bioleaching …& 0183;& 32;Souza AD Pina PS Lea˜o VA .2007. Bioleaching and chemical leaching as an integrated process in the zinc industry. Minerals Engineering Journal 20: 591–599. Svens K Kerstiens K Runkel M. 2003. Recent experiences with modern zinc processing
Bench scale microbial alysed leaching of mobile phone …The changes in chemical composition mineralogy and material surface before and after bioleaching was determined by the XRF XRD and SEM-EDS analysis of feed as well as bioleach residues. The XRF analysis confirms the bioleaching of Cu which was found as a trace element in the bioleach residues.
Skorpion Leaching ProcessBioleaching And Chemical Leaching As An Integrated This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides.The continuous bioleaching of a sphalerite concentrate assaying 51.4 zn 1.9 pb 31.8 s and 9.0 fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the bioleaching residue were assessed.
PDF Bioleaching of zinc and iron from steel plant waste …Bioleaching and chemical leaching as an integrated process in the zinc industry Article May 2007 MINER ENG Adelson D. de Souza P. S. Pina Versiane Leao This work sought to integrate bioleaching
PDF A Review of the Appli ion of Ultrasound in …Chemical and biological leaching is practiced on a commercial scale for the mining of metals from ores. Although bioleaching is an environmentally-friendly alternative to chemical
Bench scale microbial alysed leaching of mobile phone …In contrast to the previously reported studies the recent research on bioleaching suggests that base metal bioleaching from the waste at higher pulp densities is more economical 10 20 . A recent study on microbial leaching of discarded cell phones has reported 99% 56% and 29% recovery of Cu Ni and Zn respectively at 10% pulp density with pure iron oxidizers 17 .位置: 8600 Rockville Pike Bethesda MD
Bioleaching and chemical leaching as an integrated process …This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate assaying 51.4% Zn 1.9% Pb 31.8% S and 9.0% Fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the bioleaching residue were assessed.Cited by: 58
PDF Bioleaching and bioprecipitation of nickel and iron …The mechanism of bioleaching or in situ leaching is discussed in terms of close physical and chemical association between the fungal hyphae and mineral phases in the ore.
Bioleaching of gold copper and nickel from waste cellular …1/7/2015& 0183;& 32;In an effort to develop alternate techniques to recover metals from waste electrical and electronic equipment WEEE this research evaluated the bioleaching efficiency of gold Au copper Cu and nickel Ni by two strains of Aspergillus niger in the presence of gold-plated finger integrated circuits found in computer motherboards GFICMs and cellular phone printed circuit boards PCBs .位置: 8600 Rockville Pike Bethesda MD
Biological Leaching and Chemical Precipitation Methods …The Supporting Information is available free of charge on the ACS Publi ions website at DOI: 10.1021/acssuschemeng.8b02810.Comparison of removal efficiency of cobalt and lithium from spent Li-ion battery powder by fungal strains of A. niger MM1 and SG1 bacterial A. thiooxidans 80191 and chemical 102.4 mM citric acid and 10.2 mM sulfuric acid leaching methods
Minerals Free Full-Text Copper Bioleaching in China: …To date the bioheap leaching biodump leaching and in situ bioleaching processes uranium mainly have become the most common bioleaching approaches. Worldwide about 20% of Cu is extracted using bioleaching 51 52 .
An agglomerate scale model for the heap bioleaching of chalcocite& 0183;& 32;Bioleaching refers to the mobilization of metal ions from insoluble ores by biological oxidation and complexation Rohwerder et al. 2003 . The appli ion of bacterial leaching to metal recovery from mineral ores has progressed steadily in the last 20 years Olson
Minerals Free Full-Text Direct Acid Leaching of …The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe3 O2 O3 and Fe2 which is continuously oxidized in the leaching
Integrated bioleaching of copper metal from waste …Chemical leaching is rapid and efficient but causes secondary pollution. Bioleaching is a promising approach eco-friendly and economically feasible but it is slower process. This review considers the recycling potential of microbes and suggests an integrated bioleaching approach for Cu extraction and recovery from WPCBs.
Bioleaching of metals from e-waste using immobilized …Bioleaching of metals from e-waste using immobilized biomass of mesophilic Acidithiobacillus ferrooxidans : English Author It is as-sumed that chemical leaching by biogenic Fe3 integrated into the processes of leaching of PCB's may contribute