Interactions between Microbial Iron Reduction and Metal Geochemistry:  Effect of Redox Cycling on Transition Metal Speciation in Iron Bearing Sediments

2006 ◽  
Vol 40 (6) ◽  
pp. 1884-1891 ◽  
Author(s):  
D. Craig Cooper ◽  
Flynn F. Picardal ◽  
Aaron J. Coby
Keyword(s):  
Transition Metal ◽  
Iron Reduction ◽  
Metal Speciation ◽  
Redox Cycling ◽  
Microbial Iron Reduction ◽  
Iron Bearing ◽  
Metal Geochemistry

Effects and mechanisms of modified biochars on microbial iron reduction of Geobacter sulfurreducens

Chemosphere ◽  
2021 ◽  
pp. 130983
Author(s):  
Yue Lu ◽  
Yingju Hu ◽  
Lin Tang ◽  
Qingqing Xie ◽  
Qian Liu ◽  
...  
Keyword(s):  
Iron Reduction ◽  
Geobacter Sulfurreducens ◽  
Microbial Iron Reduction

Predominant microbial iron reduction in sediment in early Cambrian sulfidic oceans

2021 ◽  
pp. 103637
Author(s):  
Chaochao Xing ◽  
Xianguo Lang ◽  
Haoran Ma ◽  
Yang Peng ◽  
Yongbo Peng ◽  
...  
Keyword(s):  
Iron Reduction ◽  
Early Cambrian ◽  
Microbial Iron Reduction

Breathing Iron: Molecular Mechanism of Microbial Iron Reduction byShewanella oneidensis

2015 ◽  
pp. 5.2.1-1-5.2.1-13 ◽  
Author(s):  
Rebecca E. Cooper ◽  
Jennifer L. Goff ◽  
Ben C. Reed ◽  
Ramanan Sekar ◽  
Thomas J. Dichristina
Keyword(s):  
Molecular Mechanism ◽  
Iron Reduction ◽  
Microbial Iron Reduction

scholarly journals Peptide and RNA contributions to iron–sulphur chemical gardens as life's first inorganic compartments, catalysts, capacitors and condensers

2012 ◽  
Vol 370 (1969) ◽  
pp. 3007-3022 ◽  
Author(s):  
Shawn E. McGlynn ◽  
Isik Kanik ◽  
Michael J. Russell
Keyword(s):  
Transition Metal ◽  
Alkaline Solution ◽  
Living Cells ◽  
Organic Polymers ◽  
Laboratory Simulations ◽  
Initial Stage ◽  
Elemental Stoichiometry ◽  
Chemical Gardens ◽  
Iron Bearing ◽  
The Way

Hydrothermal chimneys and compartments comprising transition metal sulphides and associated minerals have been proposed as likely locations for the beginnings of life. In laboratory simulations of off-axis alkaline springs, it is shown that the interaction of a simulated alkaline sulphide-bearing submarine vent solution with a primeval anoxic iron-bearing ocean leads to the formation of chimney structures reminiscent of chemical gardens. These chimneys display periodicity in their deposition and exhibit diverse morphologies and mineralogies, affording the possibilities of catalysis and molecular sequestration. The addition of peptides and RNA to the alkaline solution modifies the elemental stoichiometry of the chimneys—perhaps indicating the very initial stage of the organic takeover on the way to living cells by charged organic polymers potentially synthesized in this same environment.

scholarly journals Reverse Combined Microflotation of Fine Magnetite from a Mixture with Glass Beads

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1078
Author(s):  
Nickolaj N. Rulyov ◽  
Lev O. Filippov ◽  
Dmytro Y. Sadovskyi ◽  
Vitalina V. Lukianova
Keyword(s):  
Iron Reduction ◽  
Silica Content ◽  
Glass Beads ◽  
Processing Route ◽  
Magnetite Concentrate ◽  
Initial Iron ◽  
Metallurgical Processing ◽  
Magnetite Particles ◽  
Concentrate Grade ◽  
Iron Bearing

Magnetite is an essential iron-bearing mineral. The primary method of magnetite ore beneficiation involves successive steps of crushing, grinding, and magnetic separation. Reverse cationic flotation is used at the final stage to remove silicate and aluminosilicate impurities from the magnetite concentrate and reduce silica content to 1–3%, depending on metallurgical processing route (electrometallurgy, direct iron reduction). In view of the stringent demands of the magnetite concentrate grade, before flotation, the ore is currently routinely ground down to a particle size below 35 µm, and magnetite particles are ground to a size below 10 µm. This significantly reduces the efficiency of flotation and increases iron loss in the tailings due to the hydraulic report in froth being up to 15–25%. Combined microflotation (CMF) looks to be a promising method of increasing fine-particle flotation efficiency, as it uses relatively small amounts of microbubbles alongside conventional coarse bubbles. Microbubbles act as flotation carriers, collecting gangue particles on their surface, which then coarse bubbles float. The purpose of this study is to explore the effectiveness of CMF for processing a model mixture that contained magnetite particles smaller than 10 µm and glass beads (Ballotini) below 37 µm in size when the initial iron content in the mixture was 63.76%. Commercial reagent Lilaflot 821M was used as both collector and frother. The flotation procedure, which included the introduction of 15 g/t of the collector before the start of flotation, and the addition of 5 g/t of the collector in combination with a microbubble dose of 0.018 m3/t 6 min after starting flotation, ensured an increase in the concentrate grade to 67.63% Fe and iron recovery of 91.16%.

Sorption of linear alkylbenzene sulfonate to soil components and effects on microbial iron reduction

2003 ◽  
Vol 22 (6) ◽  
pp. 1221-1228 ◽  
Author(s):  
Inge Broberg Kristiansen ◽  
Hubert de Jonge ◽  
Per Nørnberg ◽  
Ole Mather-Christensen ◽  
Lars Elsgaard
Keyword(s):  
Iron Reduction ◽  
Linear Alkylbenzene Sulfonate ◽  
Linear Alkylbenzene ◽  
Microbial Iron Reduction ◽  
Alkylbenzene Sulfonate ◽  
Soil Components
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