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Bacterial Leaching of Nickel Laterites Geoffrey Simate Simate Page iv PUBLICATIONS AND PRESENTATIONS Journal Publications 1. Simate, G. S., Ndlovu, S., 2008. Bacterial leaching of nickel laterites using chemolithotrophic microorganisms: Identifying influential factors
Mar 02, 2019· Nickel: Occurs naturally in soils, groundwater, and surface water. Often used in electroplating, stainless steel and alloy products, mining, and refining. ... Used as an indicator for the presence of pathogenic bacteria, viruses, and parasites from domestic sewage, animal waste, or …
Recovery of nickel and copper from lateritic ores. Abstract Biomining, as traditionally practised, uses aerobic, acidophilic microorganisms to accelerate the oxidative dissolution of sulfide minerals present in ores and concentrates, thereby either causing target metals to be solubilised (e.g. copper) or made accessible to chemical extraction ...
May 01, 2015· Schematic representation of the reductive dissolution of a nickel limonite in which sulfur acts as the bacterial electron donor. Tests carried out in 2 L (working volume) bioreactors maintained at pH 1.8 and 30 °C showed that >70% of the nickel in the limonite could be extracted using bacterially-catalysed reductive dissolution within 30 days ...
bacteria, algae, plant extract etc. 106 Jayandran et al. / Journal of Applied Pharmaceutical Science 5 (12); 2015: 105-110 From environmental point of view, plant extracts used reduction methods can be considered as more effective green ...
Copper can be extracted from its ore by: Underground: sinking a vertical shaft into the Earth to an appropriate depth and driving horizontal tunnels into the ore. Open pit: 90% of ore is mined by this method. Ores near the surface can be quarried after removal of the surface layers.
Over the past few years, the photogenic fabrication of metal oxide nanoparticles has attracted considerable attention, owing to the simple, eco-friendly, and non-toxic procedure. Herein, we fabricated NiO nanoparticles and altered their optical properties by doping with a rare earth element (lanthanum) using Sesbania grandiflora broth for antibacterial applications. The doping of lanthanum ...
Jun 19, 2016· Green protocols for the synthesis of nanoparticles have been attracting a lot of attention because they are eco-friendly, rapid, and cost-effective. Nickel and nickel oxide nanoparticles have been synthesized by green routes and characterized for impact of green chemistry on the properties and biological effects of nanoparticles in the last five years.
Oct 19, 2015· Abstract. Antimicrobial efficacy of nickel nanoparticles synthesized using leaf extract of Ocimum sanctum (NiGs) was investigated against pathogenic Gram-negative (E. coli, K. pneumoniae, and S. typhi), Gram-positive (B. subtilis, S. epidermidis) bacteria and fungi (C. albicans, C. tropicalis, A. fumigatus, A. clavatus, and A. niger). 100 µg/mL NiGs showed maximum antimicrobial activity ...
Aug 21, 2015· Emory Health Sciences. (2015, August 21). Chestnut leaves yield extract that disarms deadly staph bacteria: Extract shuts down staph without boosting its drug resistance. ScienceDaily…
Mining companies are also getting very serious about using biomining to extract other metals from low-grade ores, many of which contain a mixture of potentially extractable metals, such as ...
DNA fragments harboring the nickel resistance determinants from bacteria isolated from anthropogenically polluted ecosystems in Europe and Zaire were compared with those harboring the nickel resistance determinants from bacteria isolated from naturally nickel-percolated soils from New Caledonia by DNA-DNA hybridization.
May 01, 2019· The selected bacterial isolates demonstrated high endurance with toxic heavy metals and therefore, high Cd(II) and Ni(II) removal rates, ranging from 96% for cadmium to 89% for nickel following incubation for 48 h and at 500 mg/L initial concentration of each Cd(II) and Ni(II).
To evaluate nickel-resistant and total bacteria, 100 ml of appropriate dilutions was spread on nutritive broth containing 37.5% bacto beef extract and 62.5% bacto peptone (Difco) supplemented or not with 15 mM Ni (i.e. 2 g l -1 NiCl 2 ). Three plates were inoculated per dilution. Bacterial colonies were counted after 8 days of incubation at 28∞C.
Jul 20, 2021· The process has been widely used in the mining industry, where micro-organisms are used to extract valuable metals from ores. More recently, this technique has been used to clean up and recover materials from electronic waste, particularly the printed circuit boards of computers, solar panels, contaminated water and even uranium dumps.
Sep 27, 2019· Because mouth bacteria can't use xylitol as a source of energy, it may help prevent tooth decay (such as bacteria like Streptococcus mutans) and the buildup of plaque on your teeth. Another potential benefit of xylitol for similar reasons is the ability to …
"Native" bacteria, sometimes termed mesophilic bacteria, are sensitive to elevated temperatures and to some of the metals being extracted. Thus, microorganisms were sought that can withstand higher temperatures, thermophilic (and even hyperthermophilic ; i.e., 60°C or higher) microorganisms, and are tolerant to the metals being extracted.
Jan 27, 2021· Phytosynthetic Fabrication of Lanthanum Ion-Doped Nickel Oxide Nanoparticles Using Sesbania grandiflora Leaf Extract and Their Anti-Microbial Properties January 2021 Crystals 11(2):124
Ferredox was shown to extract 70% of nickel and 50% of cobalt in 14 days from low grade nickel laterite ores containing only 7% of total iron at 5% pulp density. ...
Aug 06, 2021· Bacteria help extract rare earths from mine slag heaps French researchers will start extracting rare earths, cobalt, copper, and nickel from slag heaps in Finland and New Caledonia. MINING…
Background: Pollution due to the heavy metals is a problem that may have negative consequences on the hydrosphere. One of the best procedures in removing the toxic metals from the environment is using metal resistant bacteria. Results: In the present study eight nickel resistant bacteria were isolated from industrial wastewaters.
Nov 10, 2020· Future space miners working on Mars or the Moon could be using bacteria to extract useful metals and minerals from rocks rather than drills and …
Apr 02, 2018· Monodispersed superparamagnetic nickel colloidal nanocrystal clusters synthesized by pyrolysis can capture bacteria and bacterial spores and simultaneously exert antimicrobial activity.
Bacteria have adapted to the presence of heavy metal ions in their habitats. There are five main mechanisms of heavy metal resistance in bacteria extracellular barrier, active transport of metal ...
Dec 04, 2017· Pomegranate rind extract (PGRE) is known to inhibit the production of bacterial flagellin 34, so we performed a final experiment in which the 'Ag-resistant' E. coli CCM 3954 and 'Ag ...
Apr 07, 2004· Bacteria to extract metals ; This story is from April 7, 2004. ... (Bacillus M1) to extract metals like Cobalt, Copper and Nickel from nodules (metal ore) sourced from the …
Jun 28, 2021· Realising the hazardous effect of nickel on human health, microbes and plants are effectively used for bioremediation. The endophytic microorganisms have an important role in the phytoremediation of nickel using Vigna radiata. Therefore, in order to harness the potential of microbial strains, the present study was designed to examine the metal biosorption ability of endophytic bacterial ...
Aug 04, 2021· French researchers will start extracting rare earths, cobalt, copper, and nickel from slag heaps in Finland and New Caledonia. Bacteria help extract rare earths from mine slag heaps - …