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Amorphous iron silicate scales in surface pipelines : characterization and geochemical constraints on formation conditions in the Miravalles geothermal field, Costa Rica

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dc.contributor Jarðhitaskóli Háskóla Sameinuðu þjóðanna is
dc.contributor.author Rodríguez, Alejandro 1977 is
dc.date.accessioned 2014-10-30T10:35:16Z
dc.date.available 2014-10-30T10:35:16Z
dc.date.issued 2006
dc.identifier.issn 1670-7427
dc.identifier.uri http://hdl.handle.net/10802/7952
dc.description Í : Geothermal training in Iceland 2006, s. 429-452. is
dc.description Myndefni: kort, línurit, töflur is
dc.description.abstract Scales, formed in surface pipelines as a result of mixing of neutral and acidic fluids at the Miravalles geothermal field, have been characterized by chemical analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). They consist of a chemically homogeneous amorphous iron silicate with a stoichiometry similar to the mineral minnesotaite ((Fe++,Mg)3Si4O10(OH)2). With the aid of computer programs for geochemical aqueous speciation (WATCH and EQ3NR) and for reaction path modelling of aqueous geochemical systems (EQ6), the geochemical constraints of the formation of the scales were modelled. The mixing experiments simulated with EQ6 between neutral and acidic fluids, determined a range of log K for the dissolution reaction of the scale phase, 6H+ + Fe3Si4O10(OH)2 ↔ 3Fe2+ + 4SiO2 + 4H2O, lies between 11 and 13 at 195°C. Above this range, the probabilities of over saturation of this compound are very high. On the basis of a series of mixing scenarios, acidification of neutral fluids to a pH value of 6.0 is suggested in order to prevent the formation of these scales. is
dc.format.extent 24 s. is
dc.language.iso en
dc.publisher United Nations University is
dc.publisher Orkustofnun is
dc.relation.ispartofseries United Nations University., UNU Geothermal Training Programme, Iceland. Report ; 2006-19
dc.relation.uri http://www.os.is/gogn/unu-gtp-report/UNU-GTP-2006-19.pdf
dc.subject Jarðhiti is
dc.subject Jarðhitarannsóknir is
dc.subject Jarðfræði is
dc.subject Pípulagnir is
dc.subject Virkjanir is
dc.subject Kostaríka is
dc.title Amorphous iron silicate scales in surface pipelines : characterization and geochemical constraints on formation conditions in the Miravalles geothermal field, Costa Rica en
dc.title.alternative Geothermal training in Iceland en
dc.type Bók is
dc.identifier.gegnir 001035043


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