Platon N. GamaletsosTechnical University of Crete | TUC · School of Mineral Resources Engineering
Platon N. Gamaletsos
Doctor of Philosophy
(Nano)-mineralogy
About
77
Publications
24,790
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
712
Citations
Introduction
Platon N. Gamaletsos (a.k.a. Platon N. Gkamaletsos; Scopus ID: 35228969700 & ORCID: 0000000211719032) holds a PhD of Geological & Geoenvironmental Sciences. He is a mineralogist specialized in various geomaterials and mineral resources. He focuses on the investigation of ore deposits, metallurgical residues using -among others- Synchrotron-based spectroscopy (micro-XAFS), and e-microscopy techniques in micro-/nano-scale (SEM, TEM). He is a member of the Marie Curie Alumni Association.
Additional affiliations
July 2020 - October 2021
National Center for Scientific Research Demokritos
Position
- Professor
Publications
Publications (77)
We present new data about the chemical and structural characteristics of bauxite residue (BR) from Greek Al industry, using a combination of microscopic, analytical, and spectroscopic techniques. SEM-EDS indicated a homogeneous dominant “Al-Fe-Ca-Ti-Si-Na-Cr matrix”, appearing at the microscale. The bulk chemical analyses showed considerable levels...
In some gold deposits, gold exists as invisible form in pyrite and/or arsenopyrite and its concentration is extremely low. Such gold is not recovered readily from ore materials. The identification of the gold form and distribution may provide some insight into the recovery of gold. Here we use various microscopic techniques such as electron microsc...
The present study deals with the recovery of metallic Fe and an Al-ion-rich liquid from bauxite residue (BR), with an Na-ion-rich liquid phase that could potentially be recycled or recovered as NaOH. First, BR was mixed with sodium hydroxide in mass ratios of 80/20 and 74/26, respectively. Then, each mixture was roasted under pure H2 for 2 h at 500...
Dear authors,
I would like to invite you and your team to submit a paper to our Special Issue entitled "Trends in Modern Mineral Processing and Recovery Techniques toward the Energy Transition" for Materials MDPI Journal.
The submission deadline has been updated to 20 June 2024.
For more information of the Special Issue:
https://www.mdpi.com/journa...
The presence of actinide elements (mainly U, Th) in crystals of minerals containing 'critical' metals-i.e. critical minerals-was investigated. The foremost purpose was to evaluate the potential natural radioactivity of these inorganic geomaterials. The samples included: a) REE cyclosilicate (eudialyte group) crystals from Greenland (Kingdom of Denm...
Dear authors, we are happy to invite you to submit a paper to our Special Issue "Trends in Modern Mineral Processing and Recovery Techniques toward the Energy Transition" for Materials MDPI Journal.
Detailed information about this Special Issue can be found here:
https://www.mdpi.com/journal/materials/special_issues/26AZXB0459
The submission dead...
To tackle the challenge of bauxite residue (BR), generated during the alumina production, as well as to recover some of its metal content, three combinatory H2-based processes were utilized. Firstly, Greek BR was mixed with NaOH to produce water soluble Na-aluminates and was roasted under pure H2 gas in order to reduce the Fe+3 content. Then the fi...
The sustainable use of industrial residues allows to lower the environmental
impact of the construction industry. Within this framework, use of bauxite residue
(BR) is of high interest, because of the large available volumes. Although BR is
considered to be highly alkaline for cementitious systems, it can be a suitable
precursor for inorganic polym...
The understanding of ophiolites as hosts to economic–scale chromitite ore deposits requires the integration of research relating their geochemical metallogenesis with studies of the mode and nature of their lithospheric-scale deformation. The Neotethyan Vourinos ophiolite in Northern Greece represents a well-preserved ophiolite complete with sheete...
Based on the fundamentals of nanogeoscience, mineral
nanoparticles are the nanoscale versions of common macro-scale analogue
minerals, whereas nanominerals are distinct phases existent only in
nanoscale systems without equivalents at larger scale systems.
Nanoclusters, polyphasic nanominerals, nanoporous phases, amorphous
nanomaterials, amorphous-n...
Antimony is a common metalloid occurring in the form of Sb-sulfides and sulfosalts, in various base and noble metal deposits. It is also present in corresponding metallurgical products (concentrates) and, although antimony has been considered a penalty element in the past, recently it has gained interest due to its classification as a critical raw...
Eudialyte-group minerals (EGM) attract global interest as potential resources for high-field-strength elements (e.g. Zr, Nb, Ta, and rare-earth elements), i.e. critical materials for modern technologies. They are particularly valued for their relative enrichment in the most critical lanthanides, i.e. Nd and heavy rare earth elements (Gd-Lu). Howeve...
Allanite-bearing black coastal sands of Kavala (N. Greece) were studied using a combination of single-crystal XRD, EMPA, μ-XRF, bulk ICP-MS, LA-ICP-MS, μ-XANES and γ-ray spectrometry. The sands are rich in REE (ΣREE + Y: 4010 to 10,810 mg/kg), Th (236–1205 mg/kg) and other critical metals such as Nb, Ta and Co. The main REE- and Th-hosts are allani...
Nickeliferous laterite ores from two typical central Greece deposits (Larymna and Evia), currently used in the LARCO GMMSA smelting plant to produce ferronickel, were characterized using a combination of diffraction, microscopic, and analytical techniques. X-ray diffraction patterns of various fractions, with emphasis to the clayey material (<2 μm)...
Published in Journal of Sustainable Metallurgy (https://rdcu.be/8EtH): ___________________________________________________________________________________ More recent data of Greek bauxites from the Parnassos-Ghiona active mines prove that rare earth elements (REEs) occur mainly in the form of authigenic/diagenetic LREE3+ carbonate and phosphate mi...
The Kassandra mining district contains porphyry Au-Cu and Au-Ag-Pb-Zn-Cu carbonate replacement deposits that are associated with Oligocene-Miocene intrusions emplaced into polydeformed metamorphic basement rocks belonging to the Permo-Carboniferous to Late Jurassic Kerdilion unit and the Ordovician-Silurian Vertiskos unit. Regional extensional tect...
Bauxitic Fe-Ni-laterite ore from the Patitira mine in Lokris area (Greece) contains assemblages of unusual As-bearing goethite-type phases in samples with significant organic matter. The material was initially characterized by bulk ICP-MS and SEM-EDS. Furthermore, the distribution and speciation of As were studied by Synchrotron Radiation (SR) spec...
Chromium-bearing clays occurring at Crommyonia (Soussaki), Greece, are studied in detail. In this area Mesozoic ultramafic ophiolitic rocks were affected by a Pliocene volcanic activity continuing, nowadays, with intense post-volcanic phenomena. Particularly, the Cr-bearing clays were formed at the margins of the ophiolite into highly altered serpe...
The Nordic region holds some of the world’s largest eudialyte deposits, which contain promising rare earths concentrations. Due to low content of actinides (including thorium / Th) in such rocks, eudialyte would avoid many of the issues of potential radioactive contamination in tailings that bedevil e.g., monazite and xenotime extraction. Here, we...
In some gold deposits, gold exists as invisible form in pyrite or arsenopyrite. Such gold is not recovered readily from ore materials. The identification of the gold form and distribution may provide some insight into the recovery of gold. Here, we use electron microscopy, NanoSIMS and high energy resolution fluorescence detection X-ray absorption...
Eudialyte group minerals (EGM) are economically important alkali-zirconosilicates in agpaitic syenites. Alongside c. 12 wt.% ZrO2 and 1-2 wt.% Nb2O5, EGM host c. 1-10 wt.% total rare earth oxides with relatively high proportions of valuable heavy rare earths (c. 35%). The EGM structure can accommodate REE in various sites, mostly inferred to occupy...
Eudialyte group minerals (EGM) are the focus of commercial interest because they host significant amounts of Zr, Nb and the high value mid-and heavy REE. They are complex alkali-zirconosilicates that crystallize in unusually volatile-rich peralkaline magmas with c.12 wt. % ZrO2 and 1-2 wt.% Nb2O5, and appreciable amounts of (c.1-10 wt.%) total rare...
Antimony, an emergent global contaminant, that is hydrothermally discharged along with other epithermal metals(-loids) (Au, As, Hg, Ag, Tl, Ag) onto Kolumbo volcano’s shallow (<500 m water depth) crater seabed, is fixed either in pyrite, orpiment-like As-sulfides, and ferrihydrite-like Fe-oxy(hydro)oxides, or forms independent Pb(Zn)- Sb sulfosalts...
Coastal sand samples collected from the northern part of Nisyros volcanic island (Dodecanese, Greece) were investigated for first time for their potential in strategic metals and compared with parental rocks of the island which are Quaternary volcanics with alternating lava flows, pyroclastic layers and lava domes and relevant materials located nea...
Chrome ore deposits comprise less than 1% of the volume of a pervasively serpentinized dunite body (∼3.5 km³) that constitutes the Xerolivado-Skoumtsa Mine of the Vourinos Ophiolite in northwestern Greece. Ores have been examined to aid determination of their geological mode of occurrence, their mineralogy and mineral chemistry (Cr-spinel and olivi...
Synchrotron radiation techniques (μ-XRF and μ-XANES) were applied to the study of organic-rich phosphatized limestones of NW Greece (Epirus). The results revealed uranium accumulation in areas of the material containing, among others, carbonate apatite (francolite) and organic matter. The UL 3-edge of μ-XANES spectra showed that uranium was present...
The treatment of wastewater (initial pH 7.7) from Sindos industrial area of Thessaloniki (Greece) with different proportions (0.1, 0.2, 0.4, 0.8, 1.6, 3.2, and 6.4 g) of Hellenic natural zeolite (HENAZE), resulted in overflowed clear water of pH 7.4–7.3, free of odours and improved by 69–76% for the chemical oxygen demand, 54–70% for nitrate ((Form...
This review summarizes the existing data about the geological sources of As in Greece; their variety and the relevant concentrations make Greece a peculiar territory to generalize and better understand the methodology for their assessment. These sources concern As-containing ores in active and abandoned mining areas, geothermal/hydrothermal waters,...
Amorphous orpiment-like As-sulfides (As2S3) are the most common As phases precipitating in hydrothermal systems, yet there is a lack of information regarding their solid-state characterization. Using a combination of optical, SEM-EDS, micro-Raman and XANES/EXAFS applications, we investigated yellow-orange As- and S-rich sediments occurring in the s...
Representative Greek bauxite and red mud samples were studied by means of X-ray absorption spectroscopy (XAS) in order to investigate the oxidation state and the solid-state structural environment of the Fe atoms.
http://goldschmidt.info/2015/abstracts/abstractView?abstractId=5692
Karst-type bauxite deposits have been exploited in central Greece, in the area of legendary Parnassos Mountain near the Oracle of Delphi, since 20’s. The existence of bauxite in Parnassos-Ghiona was announced around 1922, giving possibilities of developing an aluminium industry in Greece. The Al-ores are hosted within Mesozoic carbonate formations...
The commixture of sludge from Sindos industrial area of Thessaloniki with high quality HEU-type natural zeolite (tuff with 86 wt.% clinoptilolite-heulandite) in equal proportions, resulted in odourless and cohesive zeosludge. Also, the treatment of wastewater of pH 7.8 from the same area with high quality HEU-type natural zeolite (88 wt.% clinoptil...
We report on integrated geomorphological, mineralogical, geochemical and biological investigations of the hydrothermal vent field located on the floor of the density-stratified acidic (pH ~ 5) crater of the Kolumbo shallow-submarine arc-volcano, near Santorini. Kolumbo features rare geodynamic setting at convergent boundaries, where arc-volcanism a...
Supplementary Information
This review summarizes the existing data about the geological sources of As in Greece; their variety and the relevant concentrations make Greece a peculiar territory to generalize and better understand the methodology for their assessment. These sources concern As-containing ores in active and abandoned mining areas, geothermal/hydrothermal waters,...
The Sahara desert is the largest source of dust in the world. Saharan dust is characterized by great com- plexity, composed mainly of mixtures of mineral phases (amorphous or crystalline, with particle sizes of the order of μm or even nm). The presence of amorphous components makes it difficult to detect their struc- ture. For this purpose the spec...
The important role of metals and metalloids in the aquatic environment can be studied by means of Syn- chrotron Radiation (SR)-based X-ray spectroscopic techniques. In the present work, we have performed analyses of data sets (μ–XRF, μ–XANES and μ–EXAFS), for coastal sediments and marine precipitates, obtained at the ANKA Synchrotron Facility in Ka...
86 wt.% δεόιηζν ηύπνπ-HEU (θιηλνπηηιόιηζν-επιαλδίηε), 2 wt.% καξκαξπγία θαη 2 wt.% ζκεθηίηε (90 wt.% κηθξνπνξώδε νξπθηά), 5 wt.% αζηξίνπο, 3 wt.% ραιαδία θαη 2 wt.% ρξηζηνβαιίηε. Λέξειρ Κλειδιά: δεν-ιπκαηνιάζπε, βηνκεραληθή δεν-ιάζπε, θπζηθόο δεόιηζνο.
a b s t r a c t A large paleo-river of Miocene age traversing Libya from south to north has been previously demon-strated by seismic, stratigraphic, paleontological, and remote sensing data. The depositional environment of As Sahabi Formation in north central Libya is this large and now extinct Eosahabi River. However, the source of this major Afri...
We studied the geological and technological features of altered pyroclastic rocks from the main Bentomine Kimolian Enterprises S.A. quarry, in the Prassa region on the northeastern part of the Kimolos island, Greece. Particular emphasis was given to a
MOR-type (mordenite) zeolite-rich material, tuff, which also contains K-feldspars, opal-CT and cla...
This is actually a conference extended abstract that concerns a spectroscopic (Mössbauer, XANES and FTIR) and thermal (TGA-DCS) investigation of Greek karst-type bauxites from the Parnassos-Ghiona active mining area.
In: Proceedings of the “XXV Panhellenic Conference on Solid State Physics and Materials Science”
Mortar that was used in building as well as in conservation and restoration works of wall paintings have been analysed isotopically (delta(13)C and delta(18)O) in order to evaluate the setting environments and secondary processes, to distinguish the structural components used and to determine the exact causes that incurred the degradation phenomena...
Bauxite samples collected with permission from currently active mining areas in the Parnassos-Ghiona Mts district were studied using both conventional (optical microscopy and powder XRD) and, for the first time in the literature, micro-scale advanced non-destructive spectroscopic techniques, in particular Laser μ-Raman. The results showed that the...