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Ankerite
About: Ankerite is a research topic. Over the lifetime, 859 publications have been published within this topic receiving 23960 citations.
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TL;DR: In this article, the response to CO2 exposure of a variety of carbonate cemented rocks has been investigated using pressurised batch experiments conducted under simulated reservoir conditions, 70°C and 20MPa, and with a durations of up to 14 months.
12 citations
TL;DR: Sediment samples from various depths of wells GT-2, BT-1, MT-1 and KT-2 situated in Jaisalmer basin (India) have been studied.
12 citations
TL;DR: Rietveld et al. as mentioned in this paper performed CO 2 -exposure experiments using separates of rock-forming minerals on a hydrothermal rocking autoclave, which was equipped with flexible Titanium cells allowing for isobaric sampling.
11 citations
TL;DR: In this article, seven feed coals used in the Brazilian power generation industry were obtained and subsequently analyzed together with fly ash and bottom ash from a major Brazilian power plant, by means of room temperature Fe-Mossbauer analyses, X-ray diffraction, Raman spectroscopy, scanning electron microscope and petrographic analysis.
Abstract: Seven feed coals used in the Brazilian power generation industry were obtained and subsequently analysed together with fly ash and bottom ash from a major Brazilian power plant. The samples were investigated by means of room temperature Fe-Mossbauer analyses, X-ray diffraction, Raman spectroscopy, scanning electron microscope and petrographic analysis. In addition, nanometer-sized crystalline phases in coals and ashes were characterised using an energy-dispersive X-ray spectrometer and a high-resolution transmission electron microscope. The major identified Fe-bearing minerals in the coals were found to be actinolite, ankerite, chalcopyrite, chlorite, goethite, illite, ilmenite, magnesioferrite, natrojarosite, pyrite, pyrrhotite, and siderite; whilst in the fly ash and bottom ash, ankerite, chlorite, chromite, goethite, hematite, hercynite, jarosite, maghemite, magnesioferrite, and magnetite were identified. Most of the Fe in the ash samples was present as Fe^3+^ resulting from the melting of Fe and silicates during combustion. The fraction of glassy Fe in those particles is high because of the high contact probability between Fe melt and silicates. The combination of the various methods offers a powerful analytical technique in the study of coal and coal ashes. This investigation can be regarded as an introductory and prospective study prior to further quantification.
11 citations
TL;DR: In this article, the mechanisms of formation of calcite at 750° C and periclase at 950° C were discussed from a structural viewpoint using single-crystal and powder X-ray methods.
Abstract: The transformation of ankerite during heat treatment has been studied by single-crystal and powder X-ray methods. The mechanisms of formation of calcite at 750° C and of periclase at 950° C are discussed from a structural viewpoint.
11 citations