69 research outputs found
Fabrication of glass-based products as remediation alternative for contaminated urban soils of Barcelona
Peer ReviewedObjectius de Desenvolupament Sostenible::12 - ProducciĂł i Consum ResponsablesPostprint (published version
Mineralogical characterization of Sn deposits from the Santa Fe District, Bolivia
The Sn-Zn-Pb-Ag Japo-Santa Fe-Morococala ore deposit is located in the Central Andean Belt
province. The ore mineralization is hosted in a Paleozoic metasedimentary sequence and porphyritic Oligocene-Miocene igneous rocks. Ore minerals occur in veins and disseminations. Two types of ore mineralization are distinghished: (1) An early Sn mineralization and (2) a late Sn and Zn-Pb-Ag mineralization. Mineral association consists mainly of quartz, pyrite, cassiterite, other sulfides and sulfosalts. Cassiterite, up to 0.25 wt% In, constitutes the earliest mineralization. Galena and sphalerite are the main sulphide minerals. Sphalerite shows up 0.24 wt%
In. Stannite group is represented by stannoidite, kësterite, and sulfides of the Sn-Cu-Zn-Fe-S system. Sulfosalts include sakuraiite, potosiite, franckeite, freibergite, tetrahedrite, myargyrite, boulangerite, jamesonite, zinckenite, cylindrite and andorite. In this deposit, after an epigenetic magmatic stage, a long greisen-hydrothermal event took place with several episodes of metal deposition.Peer ReviewedPostprint (published version
Recycling of tailings from the Barruecopardo tungsten deposit for the production of glass
Peer ReviewedPostprint (author's final draft
MINROCIND una eina d’aprenentatge presencial e interactiva dels jaciments de roques i minerals industrials a Catalunya: eina d'aprenentatge presencial i/o interactiu en el à mbit dels ensenyaments de la mineralogia i petrologia aplicada
Es presenta un nou material didà ctic elaborat per a assolir l’aprenentatge de les roques
industrials. Consta d’una part fĂsica i una altra virtual. La primera estĂ constituĂŻda per una
mostra de roca polida i la seva lĂ mina prima, per a ser utilitzada a les prĂ ctiques a classe o
pel autoaprenentatge. La part virtual Ă©s una base de dades interactiva amb fitxes amb les
caracterĂstiques bĂ siques de la roca, i de les seves pedreres. S’inclouen les pedreres mĂ©s
importants de Catalunya. MĂ©s endavant es preveu ampliar-lo a altres Ă rees.Postprint (published version
Fe in P-doped basaltic melts: a Mössbauer spectroscopy study
The addition of P to a basalt causes a change in the environment of Fe. At low P contents iron is located in the glass structure and the Fe3+/Fe2+ ratio is about 80/20. Further addition of P causes a collapse of the glass structure related to a phase separation that triggers the crystallization of a more reduced iron-containing phosphate phase with a crystalline structure similar to that of stanfieldite, and Mössbauer parameters similar to those of the alluaudite group, together with the formation of a Fe3+-Fe2+ disordered phase. Their presence increases the viscosity of the melt.Peer ReviewedPostprint (published version
Glass-ceramic crystallization from tailings of the Morille tungsten deposit, Spain
Peer ReviewedObjectius de Desenvolupament Sostenible::12 - ProducciĂł i Consum ResponsablesPostprint (published version
MineralogĂa del depĂłsito de Sn del distrito de Santa Fe, Bolivia
El depĂłsito de Sn-Zn-Pb-Ag de Japo-Santa Fe-Morococala se encuentra en la provincia metalogenĂ©tica del cinturĂłn Central Andino. La mineralizaciĂłn se encuentra encajada en una secuencia metasedimentaria paleozoica y rocas Ăgneas porfĂdicas del Oligoceno-Mioceno. Las menas se encuentran en vetas y diseminaciones. Se distinguen dos tipos de mineralizaciĂłn: (1) una mineralizaciĂłn temprana de Sn y (2) una mineralizaciĂłn tardĂa de Sn y Zn-Pb-Ag. La asociaciĂłn mineral consiste principalmente en cuarzo, pirita, casiterita, sulfuros y sulfosales. La casiterita, hasta 0,25% en peso de In, constituye la mineralizaciĂłn más temprana. La galena y la esfalerita son los principales sulfuros. La esfalerita presenta 0,24% de In. Los minerales del grupo de la estannita están representados por estannoidita, kersterita y sulfuros del sistema Sn-Cu-ZnFe-S. Las sulfosales incluyen sakuraiita, potosiita, franckeita, freibergita, tetrahedrita, myargyrita, boulangerita, jamesonita, zinckenita, cylindrita y andorita. En este depĂłsito, despuĂ©s de una etapa magmática epigenĂ©tica, se produjo un largo evento greisen-hidrotermal con varios episodios de deposiciĂłn de metales.Peer ReviewedPostprint (published version
Potential of tungsten tailings as glass raw materials
Glasses from different types of tungsten mine tailings were obtained and studied to determine their ability to be used as raw materials of commercial glass. Tailings of granitic composition from Barruecopardo, of calc-silicate wastes from Morille, and of schists and quartz from Panasqueira, were used as raw materials. The addition of CaCO3 and NaCO3 was necessary for the manufacture of the glass. Samples were characterised by XRF, XRD, HSM and DTA-TG. Furthermore, the expansion coefficient, Vickers microhardness and leaching properties were measured. The results show that all the tungsten mine tailings used were suitable for the manufacture of commercial glass, with the addition of calcium and soda. The calc-silicate tailing needs less additive content to produce a glass. Also, they present lower workability temperatures and higher durability. Glasses obtained from all the tested tailings retain the potentially toxic elements in their structure and prevents the environmental pollution.Peer ReviewedPostprint (author's final draft
Mineralogical and thermal characterization of borate minerals from Rio Grande deposit, Uyuni (Bolivia)
Peer ReviewedPreprin
The importance of mineralogical knowledge in the sustainability of artisanal gold mining: a mid-south Peru case
Mineralogy and gold processing techniques from several mining areas of the Nazca-Ocoña gold belt, Mid-South Peru, were investigated to assess the efficiency of gold extraction methods in relation to their mineralogy. The deposits from this belt are intrusion gold related to mineralization in quartz veins. Native gold occurs as micrometric grains encapsulated in pyrite and in minor amounts in other sulfides and quartz. Electrum is found mainly in fractures of pyrite and attains up to 35 wt. % Ag. In addition to these occurrences, gold tellurides also occur and they are abundant in San Luis. Gold processing is carried out by amalgamation with mercury and/or cyanidation. The comparison of the gold grade in the mineralizations and in the residual tailings indicates that a significant amount of gold is not recovered using the mercury amalgamation process and also, in the case of the gold recovery by cyanidation, except when cement was added to the cyanide solution. This was due to an increase in the pH that favours the dissolution of the gold matrix. In the cyanidation process carried out in tailings previously treated with mercury, part of the mercury retained in them is released to the atmosphere or to the cyanidation fluids.Peer ReviewedPostprint (published version
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