نتایج جستجو برای: pyrite

تعداد نتایج: 3387  

2013
Yingqun Ma Chuxia Lin

At an initial pH of 2, while abiotic oxidation of aqueous Fe(2+) was enhanced by a flux of H2O2 at micromolar concentrations, bio-oxidation of aqueous Fe(2+) could be impeded due to oxidative stress/damage in Acidithiobacillus ferrooxidans caused by Fenton reaction-derived hydroxyl radical, particularly when the molar ratio of Fe(2+) to H2O2 was low. When pyrite cubes were intermittently expose...

2017
S. R. ORR

A carbonate concretion from the shale bed overlying the No. 5 coal of Pennsylvanian age in Tuscarawas County is composed of siderite and contains pyrite, barite, sphalerite and traces of calcite in its interior and in fractures. The siderite has 8 C = + 0.65%o, Sr=289 ppm and Sr/Sr=0.7110±0.0009These results indicate that the siderite was deposited from brackish water in the pore spaces of the ...

2016
Hajime Miki Tsuyoshi Hirajima Kazunori Oka Keiko Sasaki

An electrode system to study the mechanism of fine microgram powder sulfide mineral dissolution was developed by using a relatively simple method that enables the attachment of micrograms of fine powder to a platinum plate surface. This system yields highly reproducible results and is sensitive compared with conventional electrode systems for various sulfide minerals such as pyrite, chalcopyrit...

Journal: :Minerals 2022

The Shuangwang gold deposit, with more than 70 tons of Au, is located in the Fengxian-Taibai ore concentration area Qinling Orogen central China, hosted a Northwest-trending breccia belt. Fragments body are cemented by ankerite, albite, quartz, calcite, and pyrite. Four metallogenic stages identified mineral paragenesis: quartz-albite, ankerite-pyrite-albite, pyrite-quartz-calcite, fluorite-anh...

Journal: :Advanced materials 2016
Longfei Wu Nelson Y Dzade Lu Gao David O Scanlon Zafer Öztürk Nathan Hollingsworth Bert M Weckhuysen Emiel J M Hensen Nora H de Leeuw Jan P Hofmann

The beneficial role of marcasite in iron-sulfide-based photo-electrochemical applications is reported for the first time. A spectacular improvement of the photoresponse observed experimentally for mixed pyrite/marcasite-FeS2 films can be ascribed to the presence of p/m phase junctions at the interface. Density functional theory calculations show that the band alignment at the phase boundary con...

In this work, we present as investigation of chalcopyrite leaching under different leach conditions for how liquidation and surface of chalcopyrite study using Scanning Electron Microscopy (SEM) to determine the composition of the passivation layer in the surface of chalcopyrite. The study of chalcopyrite dissolution were in H2SO4 solution systems at pH of 1.2, with 5% chalcopyrite concentrate ...

روحبخش, پیام, ملک‌زاده شفارودی, آزاده, کریم‌پور, محمدحسن,

The Kuh Zar Au-Cu deposit is located about 100 km southeast of Damaghan city. Structurally, this area is part of the Alborz Magmatic Assemblage (AMA). The oldest rock units in the Firuzeh-Gheychi area consists of syenogranite and tourmaline biotite granodiorite units. These units were intruded by quartz monzonite porphyry stocks. Pyroxene diorite porphyry and hornblende diorite porphyry are you...

2006
Ji-hun Ryu Robert A. Zierenberg Randy A. Dahlgren Suduan Gao

Groundwater and sediment samples (~1 m depth) at sites representative of different groundwater pathways were collected to determine the aqueous speciation of sulfur and the fractionation of sulfur isotopes in aqueous and solid phases. In addition, selected sediment samples at 5 depths (from oxic to anoxic layers) were collected to investigate the processes controlling sulfur biogeochemistry in ...

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