Vivianite and siderite in lateritic iron crust: an example of bioreduction

Lemos, Vanda Porpino; Costa, Marcondes Lima da; Lemos, Ronaldo; Faria, Mário Sérgio Gomes de

doi:10.1590/s0100-40422007000100008

Cited by 44 publications

(33 citation statements)

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“…In the secondary water systems of nuclear power plants, the reductive dissolution of magnetite, and the formation of dissolved ferrous species occur under alkalized reducing conditions by the following reaction [21,22,23,24,25,26,27]. …”

Section: Resultsmentioning

confidence: 99%

Simulating Porous Magnetite Layer Deposited on Alloy 690TT Steam Generator Tubes

et al. 2018

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In nuclear power plants, the main corrosion product that is deposited on the outside of steam generator tubes is porous magnetite. The objective of this study was to simulate porous magnetite that is deposited on thermally treated (TT) Alloy 690 steam generator tubes. A magnetite layer was electrodeposited on an Alloy 690TT substrate in an Fe(III)-triethanolamine solution. After electrodeposition, the dense magnetite layer was immersed to simulate porous magnetite deposits in alkaline solution for 50 days at room temperature. The dense morphology of the magnetite layer was changed to a porous structure by reductive dissolution reaction. The simulated porous magnetite layer was compared with flakes of steam generator tubes, which were collected from the secondary water system of a real nuclear power plant during sludge lancing. Possible nuclear research applications using simulated porous magnetite specimens are also proposed.

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Section: Resultsmentioning

confidence: 99%

Simulating Porous Magnetite Layer Deposited on Alloy 690TT Steam Generator Tubes

et al. 2018

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“…Phase relations for iron mineral in lacustrine environments. Plot based on data from [85,86]. Stability fields are affected by elemental availability, e.g., sulfides pyrite and pyrhottite precipitation requires sulfur, vivianite requires phosphorous.…”

Section: Iron Mineralsmentioning

confidence: 99%

Mineralogy of Non-Silicified Fossil Wood

Mustoe

2018

Geosciences

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Abstract:The best-known and most-studied petrified wood specimens are those that are mineralized with polymorphs of silica: opal-A, opal-C, chalcedony, and quartz. Less familiar are fossil woods preserved with non-silica minerals. This report reviews discoveries of woods mineralized with calcium carbonate, calcium phosphate, various iron and copper minerals, manganese oxide, fluorite, barite, natrolite, and smectite clay. Regardless of composition, the processes of mineralization involve the same factors: availability of dissolved elements, pH, Eh, and burial temperature. Permeability of the wood and anatomical features also plays important roles in determining mineralization. When precipitation occurs in several episodes, fossil wood may have complex mineralogy.

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“…Phosphates of Fe 2+ , such as vivianite (Fe 3 (PO 4 ) 2 ·8H 2 O) and mitridatite (Ca 3 Fe 4 (PO 4 ) 4 (OH) 6 ·3H 2 O), have been identified in sherds (Maritan and Mazzoli, 2004), ferruginous lateritic crusts invaded by swamps (Costa and Lemos, 2000;Costa and Sa, 1980;Lemos et al, 2007) or even in swampy ground (Walpersdorf et al, 2013). Like the aluminum phosphates, these iron phosphates suffer thermal collapse (Fig.…”

Section: Neoformation After the Manufacture Of The Vesselsmentioning

confidence: 99%

Pre-historic production of ceramics in the Amazon: Provenience, raw materials, and firing temperatures

Rodrigues

Costa

Pöllmann

et al. 2015

Applied Clay Science

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Vivianite and siderite in lateritic iron crust: an example of bioreduction

Abstract: Recebido em 15/9/05; aceito em 25/4/06; publicado na web em 30/8/06Lateritic iron crust (LIC) samples from Padauari (AM) were analysed by XRD, optical microscopy and SEM-EDS. The equilibrium of iron minerals (IM) was studied using Eh-pH diagram

Cited by 44 publications

References 6 publications

Simulating Porous Magnetite Layer Deposited on Alloy 690TT Steam Generator Tubes

Simulating Porous Magnetite Layer Deposited on Alloy 690TT Steam Generator Tubes

Mineralogy of Non-Silicified Fossil Wood

Pre-historic production of ceramics in the Amazon: Provenience, raw materials, and firing temperatures

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