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    Wyświetlanie 1-11 z 11
    Tytuł:
    Cu-Zn slags from Røros (Norway): a case study of rapid cooling and crystal nucleation
    Autorzy:
    Warchulski, R.
    Szopa, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/100755.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Śląski. Wydział Nauk o Ziemi
    Tematy:
    Røros
    żużel
    krystalizacja
    chłodzenie
    slags
    olivine
    clinopyroxene
    crystallization
    Opis:
    The mining town of Røros located in central Norway was established in 1644 and it is known of historical mining industry related to copper. Røros was designated as an UNESCO World Heritage Site in 1980 on the base of mining culture represented by, e.g., unique wooden architecture. Slag pieces are composed of three parts differing in glass to crystallites ratio. Røros slags are composed of olivine- and pyroxene- group minerals accompanied by sulphides, with glass in the interstices. Temperature gradient and volatiles content were determined as the main factor influencing crystallization process in this material.
    Źródło:
    Contemporary Trends in Geoscience; 2014, 3, 1; 68-75
    2299-8179
    Pojawia się w:
    Contemporary Trends in Geoscience
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ameboidalne oliwinowe agregaty w chondrytach zwyczajnych
    Amoeboid Olivine Aggregates in ordinary chondrites
    Autorzy:
    Owocki, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1032782.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    meteorites
    ordinary chondrite; Amoeboid Olivine Aggregate; thermal metamorphism
    Opis:
    An amoeboid olivine aggregates (AOA) are the refractory end-member of a family of fine-grained inclusions. They consist of masses of fine-grained (generally forsteritic) olivine crystals with other phases dispersed in between. The AOA are important components of carbonaceous chondrite and have been reported only from the unequilibrated Semarkona LL3.0 ordinary chondrite and examined by author equilibrated Sahara 02500 ordinary chondrite. The AOA’s are thought to represent solar-nebula condensates that experienced high-temperature annealing, but largely escaped melting. An amoeboid olivine aggregate found in the equilibrated ordinary Sahara 02500 chondrite has experienced weak planetary metamorphism resulting in equilibration and recrystallization of fine-grained olivine and albitic feldspar. The aggregate contains several fine-grained inclusions consisting of recrystallised fayalitic olivine, feldspar and minor amounts of metal, diopside, chromite, and apatite.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2011, 2; 112-116
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterisation and evaluation of columnar basalt geoheriatge in Thailand: Implication for geotourism management in post-quarring area
    Autorzy:
    Singtuen, Vimoltip
    Anumart, Apussorn
    Powiązania:
    https://bibliotekanauki.pl/articles/2054574.pdf
    Data publikacji:
    2022-03-31
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    geoheritage
    geology
    volcanic rock
    olivine basalt
    geochemistry
    quarry
    Opis:
    Late Cenozoic basaltic rocks in Nang Rong Columnar Jointed Basalts in southern Khorat Plateau are among the greatest columnar basalts in Thailand as famous geoheritage sites. This work aims to characterize and evaluate the post-quarrying area by field investigation, petrography, geochemistry, and geological engineering. A petrographical study determines these basalts as olivine basalts, presenting porphyritic texture with olivine microphenocryst. Geochemical characteristics indicate these basalts were alkaline basalt generated from alkaline sodic magma series within the continental plates. In addition, columnar jointed basalt presents compressive strength and point load strength index higher than platy basalt with a higher percentage of alteration. Local authorities enhance people in the area to develop and promote their georesources through touristic activities. This geoheritage demonstrates high geology and tourism management values; thus, it could be the prototype of the post-quarrying geosite of Thailand.
    Źródło:
    Quaestiones Geographicae; 2022, 41, 1; 37-50
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of particle size on flotation separation of ilmenite, olivine, and pyroxene
    Autorzy:
    Yang, Yaohui
    Xu, Longhua
    Liu, Shujun
    Deng, Jian
    Powiązania:
    https://bibliotekanauki.pl/articles/1447002.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    olivine pyroxene
    ilmenite
    fine particles
    narrow size
    flotation separation
    Opis:
    The rock type in Panxi area is changing from gabbro type to olivine pyroxene type, which makes it difficult for enterprises to obtain better beneficiation indexes at present. In order to solve this problem, we use a variety of modern test techniques, such as zeta potential measurements, Fourier-transform infrared (FTIR) spectroscopy, adsorption amount measurements, and mineral-reagent interaction energy simulation to analyze the influence of particle size on mineral flotation behavior and the interaction of fine-grained minerals in this paper. The experiments results indicate that the presence of fine-grained (-19 um) mineral particles is deleterious to the flotation of ilmenite, the ilmenite recovery decreases as the microfine grade content of pyroxene and olivine increases, distribution of narrow size minerals is beneficial to the minerals flotation performance, and the order of sodium oleate (NaOL) adsorption strength on different ilmenite crystal planes is (1011) > (0001). The research results of this paper deepen the understanding of the olivine type ilmenite resources in Panxi area, enrich the theoretical system of flotation separation of refractory ilmenite, and provide theoretical support for the key technical problems of flotation separation of ilmenite in Panxi area.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 5; 106-117
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania ureilitu NWA XXX za pomocą analitycznej mikroskopii elektronowej
    Studies of a new NWA XXX ureilite by analytical electron microscopy
    Autorzy:
    Szurgot, Marian
    Powiązania:
    https://bibliotekanauki.pl/articles/1032691.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    analytical electron microscopy
    meteorite
    new urelite NWA XXX
    olivine
    pyroxene
    Opis:
    New NWA XXX ureilite was investigated by analytical electron microscopy to determine elemental and mineral composition of the meteorite. The main minerals: olivines and clinopyroxenes have been identified and characterized. The texture, elemental and mineral composition of the meteorite are typical of olivine-pyroxene achondrites.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2009, 1; 137-141
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identyfikacja minerałów meteorytu NWA 4047 za pomocą spektroskopii Ramana
    Identification of minerals of NWA 4047 meteorite by Raman spectroscopy
    Autorzy:
    Szurgot, Marian
    Kisiel, Krzysztof
    Kisiel, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/1032694.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    confocal Raman micro-spectroscopy
    olivine
    ordinary chondrite NWA 4047
    plagioclases
    pyroxene
    Opis:
    Ordinary chondrite NWA 4047 was investigated by confocal Raman microspectroscopy to identify the extraterrestrial minerals. Olivines, orthopyroxenes, clinopyroxenes, plagioclase, graphite and diamond have been identified and characterized.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2009, 1; 147-150
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Mössbauer studies of the Baszkówka ordinary chondriteand some other meteorites
    Autorzy:
    Gałązka-Friedman, J.
    Bauminger, E. R.
    Nowik, I.
    Bakun-Czubarow, N.
    Stępniewski, M.
    Siemiątkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059308.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ordinary chondrites
    parent body
    Mössbauer spectroscopy
    Q angle
    troilite
    kamacite
    olivine
    pyroxene
    weathering
    oxidation
    Opis:
    It was suggested that perhaps Mössbauer parameters of troilite could serve as a criterion for an interpretation of the origin of various meteorites. It was found that in three meteorites coming from the same parent body (Baszkówka, Mt. Tazerzait and Songyuan) the angle between the principal axis of the electric field gradient (EFG) and the direction of the magnetic field in troilite is around 60o. Further investigations showed that in some other meteorites, not belonging to this group, this angle is close to 90o.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 319-326
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiometric dating of the Tertiary volcanics in Lower Silesia, Poland. III. K-Ar and palaeomagnetic data from Early Miocene basaltic volcanics near Jawor, Fore-Sudetic Block
    Datowanie radiometryczne trzeciorzędowych wulkanitów Dolnego Śląska. III. Daty K-Ar i wyniki badań paleomagnetycznych dolnomioceńskich skał bazaltowych okolic Jawora (Blok Przedsudecki)
    Autorzy:
    Birkenmajer, K.
    Pécskay, Z.
    Grabowski, J.
    Lorenc, M. W.
    Zagożdżon, P. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/191562.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    K-Ar dating
    basaltic rocks (basanite, olivine basalt)
    palaeomagnetism
    Early Miocene (Aquitanian, Burdigalian)
    Lower Silesia
    Polska
    Opis:
    The K-Ar dating of Tertiary basaltic rocks near Jawor, Lower Silesia (Poland), included the sites at Winna Góra (plug) and at Męcinka (lava flow, and vent/dyke), well exposed in working quarries. According to new geochemical data, these rocks, classified so-far as trachyandesites, have been reclassified as basanite and olivine basalt. Early Miocene (Aquitanian) K-Ar ages, have been obtained from the basanite lava flow at Męcinka (21.05š0.85 Ma), and from the basanite plug at Winna Góra (21.62š0.93 Ma, and 21.96š1.36 Ma, respectively). An olivine basalt vent/dyke which cuts the lava flow at Męcinka yielded a younger (Burdigalian) K-Ar age (18.66š0.82 Ma). New palaeomagnetic analysis confirmed the results of previous studies that these rocks were magnetized during a reversed regime of geomagnetic field. The basanite (plug and lava) K-Ar dates spread over reversed parts of the magnetozones C6A and C6B. A significantly younger K-Ar date from olivine basalt intrusion might be correlated either with the C5D or the C5E magnetozones.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2002, 72, No 3; 241-253
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Automatic Core Shooting Parameters in Hot-Box Technology on the Strength of Sodium Silicate Olivine Moulding Sands
    Autorzy:
    Stachowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382292.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    sodium silicate
    olivine sand
    hot-box process
    core shooting
    odlewnictwo
    krzemian sodu
    piasek oliwinowy
    proces hot-box
    rdzeń
    Opis:
    The paper presents the results of preliminary research on the application of olivine moulding sands with hydrated sodium silicate containing 1.5 % wt. of binder to perform ecological casting cores in hot-box technology using a semi-automatic core shooter. The following parameters were used in the process of core shooting: initial shot pressure of 6 bar, shot time 3 s, the temperature of the core-box: 200, 250 and 300°C and the core curing time: 30, 60, 90, 120 and 150 s. The matrix of the moulding mixture was olivine sand, and the binder of the sandmix was commercial, unmodified hydrated sodium silicate with molar module SiO2/Na2O of 2.5. In one shot of the automatic core-shooter were formed three longitudinal specimens (cores) with a dimensions 22.2×22.2×180 mm. The samples obtained in this way were subjected to the assessment of the influence of the shooting parameters, i.e. shooting time, temperature and curing time in core-box, using the following criteria: core box fill rate, mechanical strength to bending RgU, apparent density, compaction degree and susceptibility to friability of sand grains after hardening. The results of trials on the use of olivine moulding sands with hydrated sodium silicate (olivine SSBS) in the process of core shooting made it possible to determine the conditions for further research on the improvement of inorganic hot-box process technology aimed at: reduction of the heating temperature and the curing time. It was found that correlation between the parameters of the shooting process and the bending strength of olivine moulding sands with sodium silicate is observed.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 67-72
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ sposobu nagrzewania i grubości rdzeni pomiarowych wykonanych z oliwinowych mas formierskich z krzemianem sodu na odkształcalność badaną na urządzeniu DMA Hot-Distortion
    The influence of heating method and the thickness of measuring cores made of olivine moulding sands with sodium silicate on the deformation tested with a DMA Hot-Distortion device
    Autorzy:
    Stachowicz, M.
    Paduchowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/391413.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    odlewnictwo
    oliwinowa masa formierska
    uwodniony krzemian sodu
    odkształcenie plastyczne
    nagrzewanie mikrofalowe
    foundry engineering
    olivine moulding sand
    hydrated sodium silicate
    thermal deformation
    microwave heating
    Opis:
    W artykule podjęto tematykę wpływu podwyższonej temperatury na oliwinowe masy formierskie i rdzeniowe ze spoiwem nieorganicznym z grupy niemodyfikowanych gatunków uwodnionego krzemianu sodu. Sporządzone w warunkach laboratoryjnych masy na osnowie piasku oliwinowego formowano w kształtki prostopadłościenne do badania przemieszczenia wolnego końca rdzenia pomiarowego w warunkach otoczenia o podwyższonej temperaturze. W celu utwardzenia, wykonane z mas oliwinowych, kształtki poddawano szybkiemu nagrzewaniu mikrofalowemu w piecu z generatorem częstotliwości fali elektromagnetycznej f = 2,45 GHz i mocy wyjściowej 1000 W, w czasie 180 s. Badania przeprowadzono na kształtkach prostopadłościennych formowanych we wnęce o wymiarach: 25,9 × G × 120,4 mm, gdzie G = 6 lub 8, lub 10 mm. Pomiary przemieszczeń wolnego końca kształtek rdzeni pomiarowych przeprowadzono na zautomatyzowanym urządzeniu laboratoryjnym DMA Hot- Distortion. W trakcie pomiarów zastosowano trzy sposoby ogrzewania powierzchni prostopadłościennych kształtek spotykanych w technice pomiarowej odkształceń H-D (Hot Distortion Test): grzanie od dołu, grzanie od dołu i od góry (Modified Hot Distortion Test) oraz ogrzewanie tylko od góry. Przemieszczenie wolnego końca kształtek prostopadłościennych, w zależności od grubości oraz sposobów ogrzewania ich powierzchni, posłużyło do wstępnej oceny zachowania utwardzonych mikrofalowo mas oliwinowych z krzemianem sodu w warunkach otoczenia o podwyższonej temperaturze.
    The article raises the issue of the influence of increased temperature on olivine moulding and core sands with an inorganic binder from the group of unmodified kinds of hydrated sodium silicates. Produced at laboratory conditions, moulding sands with an olivine sand matrix were formed into cuboidal specimens to test the deformation of the free measuring core end at conditions of increased temperature. In order to harden, the measuring cores made of olivine moulding sands fast microwave heating was applied to which used was a furnace with an electromagnetic wave frequency generator f = 2.45 GHz and output power of 1000 W, in the time period of 180 s. Tests were carried out on cuboidal specimens moulded in a cavity with the dimensions 25.9 × G × 120.4 mm, where G = 6 or 8 , or 10 mm. Measurements of deformation of the free specimen end of the measuring cores were conducted on an automated laboratory DMA Hot-Distortion apparatus. During the measurements three techniques were used to heat the surfaces of cuboidal specimens which are applied in the Hot Distortion Test: heating from the bottom, heating from the bottom and the top (Modified Hot Distortion Test), and heating only from the top. The deformation of the free end of cuboidal specimens, depending on the thickness and heating techniques of their surfaces, served for the initial assessment of the behaviour of microwave hardened olivine moulding sands with sodium silicate at conditions of increased temperature.
    Źródło:
    Prace Instytutu Odlewnictwa; 2018, 58, 4; 277-293
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of a New Innovative Ceramic Material for Investment Casting Technology
    Autorzy:
    Stefański, Z.
    Izdebska-Szanda, I.
    Angrecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381703.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry materials
    investment casting technology
    olivine sand
    self-supporting mould
    Innowacyjna technologia odlewnicza
    innowacyjne materiały odlewnicze
    odlewnictwo
    forma odlewnicza
    Opis:
    The article presents the research results of a new ceramic material, in which olivine sand was used as the matrix. This new ceramic material was studied at the angle of its application in the investment casting technology. This material will be mainly used for preparing self-supporting moulds for castings made of aluminium and magnesium alloys, replacing the expensive material – molochite which has been used so far. The article presents the results of mineralogical research of olivine sand, as well as thermophysical research of the new ceramic material made on the olivine sand matrix. Comparative research of both materials was conducted, i.e. with the olivine and molochite matrix, then the assessment of the quality of the new ceramic material was made. What is more, the research results of the developed ceramics and its usefulness for the production of castings are presented.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 51-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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