Consideration of grain packing in granular iron treatability studies

2014 ◽  
Vol 164 ◽  
pp. 230-239 ◽  
Author(s):  
R. Firdous ◽  
J.F. Devlin
Keyword(s):  
Grain Packing ◽  
Granular Iron

Manufacturing a Mechanical Unit for Grain Packing

2016 ◽  
Vol 7 (11) ◽  
pp. 837-846
Author(s):  
A. El-Sayed ◽  
M. Megahed ◽  
Y. Ramadan ◽  
A. El-Beba
Keyword(s):  
Mechanical Unit ◽  
Grain Packing

Grain geometry effect on the magnetic properties of a granular iron-based superconductor LaFeAsO1−xFx

2011 ◽  
Vol 25 (2) ◽  
pp. 025010 ◽  
Author(s):  
Massimiliano Polichetti ◽  
Danilo Zola ◽  
Jian-Lin Luo ◽  
Gen-Fu Chen ◽  
Zheng Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Geometry Effect ◽  
Iron Based ◽  
Granular Iron

Column Study on the Effect of Nitrate and Chloride on TCE Removal by Granular Iron

2011 ◽  
Vol 356-360 ◽  
pp. 1642-1646
Author(s):  
Xue Qiang Zhu ◽  
Bao Ping Han ◽  
Guo Jun Wu ◽  
Xiao Qing Zhang
Keyword(s):  
Pitting Corrosion ◽  
Nitrate Concentration ◽  
Chloride Concentration ◽  
Inorganic Anions ◽  
Dual Effect ◽  
Column Study ◽  
Granular Iron ◽  
High Chloride ◽  
Chloride Concentrations

The effects of individual inorganic anions (nitrate and chloride) on the reactivity of granular iron were investigated using plexiglass columns packed with granular iron. The results show that TCE removal decreases apparently with increasing nitrate concentration due to competition for reactive sites. Chloride exhibits dual-effect on the TCE removal by Fe0. In the studied condition, the TCE dechlorination is enhanced at the low chloride concentration due to pitting corrosion and is dampened at the high chloride concentrations such as 59.98 and 110.45 mg/L as Cl-.

scholarly journals Life on a Mesoarchean marine shelf – insights from the world’s oldest known granular iron formation

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Albertus J. B. Smith ◽  
Nicolas J. Beukes ◽  
Jens Gutzmer ◽  
Clark M. Johnson ◽  
Andrew D. Czaja ◽  
...  
Keyword(s):  
Iron Formation ◽  
Granular Iron

Ion microprobe analyses of δ18O in early quartz cements from 1.9Ga granular iron formations (GIFs): A pilot study

2012 ◽  
Vol 214-215 ◽  
pp. 258-268 ◽  
Author(s):  
Lauren C. Cunningham ◽  
F. Zeb Page ◽  
Bruce M. Simonson ◽  
Reinhard Kozdon ◽  
John W. Valley
Keyword(s):  
Pilot Study ◽  
Ion Microprobe ◽  
Granular Iron ◽  
Iron Formations

Sedimentary and metamorphic lithofacies of the Lower Negaunee Iron Formation, Marquette District, Michigan, USA

2013 ◽  
Vol 50 (12) ◽  
pp. 1165-1177
Author(s):  
Natalie J. Pietrzak-Renaud
Keyword(s):  
Shear Zone ◽  
Mineral Assemblage ◽  
Regional Metamorphism ◽  
Regional Scale ◽  
Open Pit ◽  
Iron Formation ◽  
Banded Iron Formation ◽  
Brittle Fractures ◽  
Granular Iron ◽  
The Republic

The base of the Proterozoic Negaunee Iron Formation is exposed in the open pit at Tilden Mine, Marquette, Michigan. Juxtaposed against the Archean-aged Palmer Gneiss, it is bounded by the regional-scale Southern Shear Zone and cut by two sets of dykes: an older chloritic and schistose set and a younger 1.1 Ga Keweenawan set. Tilden Mine is dominated by a 100 m scale plunging northwest-anticline and is cut by a growth fault locally termed the Tower Hill Fault that intersects the Southern Shear Zone. The base of the exposed iron formation is composed of three lithofacies, including lower clastics that grade into the overlying banded iron formation that in turn grades upward into granular iron formation. This succession is capped by chloritic metadiabases locally termed the Summit Hill Sill and Pillar Intrusive. Petrographic and mineral chemical investigations document primary or early diagenetic hematite, siderite and possibly ferri-hydrite, metamorphic and related hydrothermal magnetite, chlorite, late martite overgrowing earlier magnetite and growth of specularite. All three lithofacies are cut by brittle fractures and late quartz veins. Brittle fractures are coated with chlorite, carbonate minerals, fluor-apatite, and sparse Cu-sulphides. These lithofacies document initial clastic sedimentation of strained detrital quartz into a subsiding fault trough. Over time, as subsidence slowed or sea level fluctuated, clastic deposition competed with quiescent chemical sedimentation, leading to deposition of the banded iron formation facies. As a stable shelf platform emerged, the granular iron formation facies was deposited via wave reworking of hardgrounds. Subsequent diagenesis initiated dissolution of carbonate and chert and promoted diagenetic replacement of primary iron minerals and chert. Regional metamorphism during Penokean orogeny at 1875–1835 Ma produced a suite of secondary metamorphic and related hydrothermal minerals. Metamorphism and hydrothermal flux related to the 1750 Ma development of the Republic Metamorphic Node overprinted the iron formation at Tilden to greenschist facies and infilled brittle fractures with a unique mineral assemblage. This unique mineral assemblage exhibits some striking similarities to Mn, Au, and Cu-sulphides documented at Champion Mine, west of Tilden, and proximal to the core of the Republic Node.

scholarly journals Sensitivity Analyses for Modeling Evolving Reactivity of Granular Iron for the Treatment of Trichloroethylene

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1878
Author(s):  
Sung-Wook Jeen
Keyword(s):  
Numerical Model ◽  
Permeable Reactive Barrier ◽  
Sensitivity Analyses ◽  
Base Case ◽  
Model Parameters ◽  
Iron Corrosion ◽  
Predictive Tool ◽  
Previous Modeling Study ◽  
Granular Iron

To better predict long-term performance of a remediation system, parameters of a numerical model should be constrained with care by calibrating with reliable experimental data. This study conducted sensitivity analyses for model parameters, which were shown to represent reasonably well the observed geochemical behaviors for the column experiments that evaluated evolving reactivity of granular iron for the treatment of trichloroethylene (TCE) resulting from precipitation of secondary minerals. The particular model parameters tested include iron corrosion rate, aragonite and Fe2(OH)2CO3 precipitation rates, and proportionality constants for each mineral. For sensitivity analyses, a specific parameter was systematically changed, while other parameters were fixed at the values for the base case. The ranges of parameters tested were determined based on the previous modeling study. The results showed that the most important and sensitive model parameters were secondary mineral precipitation rates. Also, not only absolute precipitation rate for each mineral but also relative precipitation rates among different minerals were important for system performance. With help of sensitivity analysis, the numerical model can be used as a predictive tool for designing an iron permeable reactive barrier (PRB) and can provide implications for the long-term changes in reactivity and permeability of the system.

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