Results 41 to 50 of about 18,694 (284)

Facile Synthesis and Characterization of Pure Tochilinite‐like Materials from Nanoparticulate FeS

Zeitschrift für anorganische und allgemeine Chemie, Volume 648, Issue 23, December 13, 2022., 2022
Abstract In this work, three different tochilinite‐like materials have been obtained by sophisticated synthetic methods that allow to control the distribution of iron ions. The purity of the samples was confirmed by powder X‐ray diffraction. From elemental analysis and Mössbauer spectroscopy data, detailed compositions could be determined: T1) Fe0.76S ...
Robert Bolney, Mario Grosch, Mario Winkler, Joris van Slageren, Wolfgang Weigand, Christian Robl   +5 more
wiley   +1 more source

Preparation of pyrite concentrate powder from the Thackaringa mine for quantitative phase analysis using X‐ray diffraction

Journal of Applied Crystallography, Volume 55, Issue 6, Page 1572-1582, December 2022., 2022
A method for performing accurate quantitative phase analysis using X‐ray powder diffraction of pyrite concentrate mineral samples from the Thackaringa mine has been devised. The sample preparation optimization process is described. Grain size reduction suitable for analysis by the Rietveld method was achieved using ball milling.The quantitative phase ...
Hamish McDougall, Monica Hibberd, Andrew Tong, Suzanne Neville, Vanessa Peterson, Christophe Didier   +5 more
wiley   +1 more source

Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV

Scientific Reports, 2017
Pyrite oxidation by mixed mesophilic acidophiles was conducted under conditions of controlled and non-controlled redox potential to investigate the role of sessile microbes in pyrite oxidation.
Chang Liu, Yan Jia, Heyun Sun, Qiaoyi Tan, Xiaopeng Niu, Xuekun Leng, Renman Ruan   +6 more
doaj   +1 more source

Study on Water Wettability Mechanism of Pyrite and Coal Surfaces Based on Density Functional Theory

Kuangchan zonghe liyong, 2022
Flotation is based on the difference of wettability of mineral surfaces. In order to study the water wettability mechanism of pyrite and coal surfaces, pyrite and perfect coal surface models were constructed. The adsorptions of water and oxygen molecules
Chengyong Wang, Peng Chen, Jinlong Tan, Yongcheng Fang   +3 more
doaj   +1 more source

Interaction mechanism of tannic acid with pyrite surfaces and its response to flotation separation of chalcopyrite from pyrite in a low-alkaline medium

Journal of Materials Research and Technology, 2020
In the process of chalcopyrite–pyrite flotation, depression of pyrite is of great significance. In this study, tannic acid (TA) was used to replace traditional inorganic reagents for depression of pyrite under the low-alkalinity condition, and the ...
Guang Han, Shuming Wen, Han Wang, Qicheng Feng   +3 more
doaj  

Effect and mechanism of organic depressant on the hydrophobicity of chalcopyrite and pyrite under weakly alkaline environment

Journal of Materials Research and Technology, 2021
In a chalcopyrite and pyrite flotation system, the effect and mechanism of organic depressant sodium dimethyl dithiocarbamate on the hydrophobicity of chalcopyrite and pyrite were studied.
Xu Bai, Jian Liu, Shuming Wen, Yilin Lin
doaj  

Effect of Pyrite on Thiosulfate Leaching of Gold and the Role of Ammonium Alcohol Polyvinyl Phosphate (AAPP)

Metals, 2017
The effect of pyrite and the role of ammonium alcohol polyvinyl phosphate (AAPP) during gold leaching in ammoniacal thiosulfate solutions were investigated using pure gold foils.
Xiaoliang Liu, Bin Xu, Xin Min, Qian Li, Yongbin Yang, Tao Jiang, Yinghe He, Xi Zhang   +7 more
doaj   +1 more source

Superconductivity in defective pyrite-type iridium chalcogenides IrxCh2 (Ch = Se and Te) [PDF]

, 2012
We report superconductivity in defective pyrite-type iridium chalcogenides IrxCh2. Maximum values of Tc of 6.4 K for Ir0.91Se2 and 4.7 K for Ir0.93Te2 were observed. It was found that Ir0.75Ch2 is close to the boundary between metallic and insulating states and IrxCh2 systems undergo nonmetal to metal transitions as x increases. On the basis of density
arxiv   +1 more source

Phase Stability and Thermoelectric Properties of the Mineral FeS2: An Ab Initio Study [PDF]

J. Phy. Chem. C, 117, 21120 (2013), 2013
First principles calculations were carried out to study the phase stability and thermoelectric properties of the naturally occurring marcasite phase of FeS$_2$ at ambient condition as well as under pressure. Two distinct density functional approaches has been used to investigate the above mentioned properties.
arxiv   +1 more source

Contrasting Ferromagnetism in Pyrite FeS$_2$ Induced by Chemical Doping versus Electrostatic Gating [PDF]

Phys. Rev. Materials 4, 054405 (2020), 2020
Recent advances in electrostatic gating provide a novel way to modify the carrier concentration in materials via electrostatic means instead of chemical doping, thus minimizing the impurity scattering. Here, we use first-principles Density Functional Theory combined with a tight-binding approach to compare and contrast the effects of electrostatic ...
arxiv   +1 more source