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    Wyświetlanie 1-8 z 8
    Tytuł:
    Characterization of barren, granitic soils from the Nubian Desert (SW Egypt) by 57Fe Mössbauer spectroscopy
    Autorzy:
    Hassan, Kamaleldin M.
    Gunnlaugsson, Haraldur P.
    Powiązania:
    https://bibliotekanauki.pl/articles/127629.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    Egipt
    granites
    soils
    Mössbauer
    Fe oxides
    vermiculite-chrorite
    smectite
    Opis:
    57 Fe Mössbauer spectroscopy - a versatile technique involving the recoil-free, resonant absorption and emission of nuclear gamma (γ) rays by the iron-57 isotope in natural iron in solids - has been used to provide quantitative information about the mineral host, occupation sites and oxidation states of iron atoms in geological samples. This technique has been applied to the bulk chemistry of a barren soil (Soil A) derived from an aluminous-type granite and another barren soil (Soil B) derived from a sodic-type granite located ~ 100 kilometers apart in the Nubian Deseit in the currently hyper arid south-west of Egypt and which exhibit distinct chemical and mineral differences. The analyses indicate different mineral hosts for the iron in these samples, namely, vermiculite-chlorite plus some hematite in Soil A and hematite and goethite plus minor aegirines in Soil B. Each soil has distinct intensities of oxidized iron (89% for Soil A and 100% for Soil B) and these differences reflect changes in soil sources and processes.
    Źródło:
    Mineralogia; 2013, 44, 1/2; 39-50
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expanded vermiculite-reached product obtained from mining waste: the effect of roasting temperature on the agronomic properties
    Autorzy:
    Kremenetskaya, Irina
    Alekseeva, Svetlana
    Slukovskaya, Marina
    Mosendz, Irina
    Drogobuzhskaya, Svetlana
    Ivanova, Liubov
    Powiązania:
    https://bibliotekanauki.pl/articles/1449516.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    recycling
    beneficiation
    vermiculite
    lizardite
    differential thermal analysis
    Opis:
    This article explores the possibility of using the vermiculite-lizardite granular product with 30% of vermiculite content for the potential agronomic application. The vermiculite-lizardite product was obtained by beneficiation of phlogopite mining waste (Kovdor, Murmansk region, Russia). The beneficiation scheme included a hydro separator, a spiral separator, and concentrating tables. The output of vermiculite-lizardite product was about 35%. The effect of roasting temperature on the hydrophysical and agrochemical properties of the vermiculite-lizardite material and the mono-mineral vermiculite was studied. Heat treatment of materials was performed in the laboratory shaft furnace. Based on the differential thermal analysis results, a temperature of 700℃ was selected as the upper limit and the temperature of 400℃ - as the lower limit of the temperature range in order to obtain an expanded vermiculite-reached product containing lizardite. For samples obtained in this temperature range with a step of 25℃, a set of data such as bulk density, water saturation, surface area, volume and average pore diameter, Eh, pH suspensions in water and KCl solution, chemical resistance in ammonium acetate solution buffered at pH 4.65 were obtained. The temperature range of 500-600℃ of the vermiculitelizardite granular product was determined as favorable for agronomic application.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 102-112
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Treatment of Multi-Tonnage Manganese-Containing Waste Water Using Vermiculite
    Autorzy:
    Matveeva, V.
    Danilov, A.
    Pashkevich, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/124264.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    sewage
    hydrochemical anomaly
    manganese
    sorbent
    vermiculite
    tailing dumps
    negative impact
    Opis:
    The article presents the results of field and laboratory studies on the state of surface waters in the impact zone of one of the largest mining enterprises of the Russian Federation, i.e. Kovdor Mining and Processing Combine. On the basis of the data from the monitoring studies, the patterns of migration and transformation of manganese in the system of wastes of enrichment – surface water – are revealed. In order to solve the existing environmental problem, an effective method of treating sewage from manganese using organic sorbent based on vermiculite is proposed. The results of laboratory tests of the sorbent are described depending on the method of its modification, as well as on the composition and properties of the purified water. The proposed method of sewage treatment will reduce the negative impact of the company on surface water, thereby improving the ecological situation in the study area and improving the quality of life of the local population.
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 1; 156-162
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of holmium on catalytic properties of Fe or Cu-modified vermiculites
    Autorzy:
    Samojeden, Bogdan
    Grzybek, Teresa
    Kowal, Joanna
    Szymaszek, Agnieszka
    Jabłońska, Magdalena
    Gläser, Roger
    Motak, Monika
    Powiązania:
    https://bibliotekanauki.pl/articles/109844.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    selective catalytic reduction
    deNOx
    holmium
    vermiculite
    Opis:
    Natural layered clay, vermiculite, was modified and tested as catalyst for the selective catalytic reduction of NOx with ammonia (NH3-SCR). Its modification included the application of the blowing agent (azodicarbonamide), acid treatment and pillaring with Al2O3. Active phase (transition metals: Cu or Fe) was introduced via impregnation. The obtained materials were characterized by N2 sorption (texture), XRD (structure), DR-UV-Vis (oxidation state and aggregation of the active phase), H2-TPR (reducibility of the active phase), in situ DRIFTS (types of adsorbed species due to contact of the sample NH3) and NH3-TPD (type/strength of the acidic sites). The initial modification procedures (treatment with azodicarboamide) resulted in the increase of specific surface area of vermiculite. The introduction of transition metal ions provided a significant amount of acidic sites. The promoting impact of holmium was confirmed by the increased strength of the sites. The highest catalytic activity was exhibited by the sample Fe-containing vermiculite and doped with Ho.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1484-1495
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czerwone iły ze Szkucina (woj. świętokrzyskie) i ich przydatność przemysłowa
    Red clays from Szkucin (Świętokrzyskie Voivodeship) and their industrial application
    Autorzy:
    Wyszomirski, P.
    Muszyński, M.
    Zawrzykraj, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/216238.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    czerwone iły
    surowiec ceramiczny
    Szkucin
    Góry Świętokrzyskie
    wermikulit
    monoporosa
    monocottura
    red clays
    ceramic raw material
    Holy Cross Mountains
    vermiculite
    monoporosa tiles
    Opis:
    W złożu Szkucin występują utwory wieku górnotriasowego. Są to czerwonobrunatne iły i gliny oraz podrzędnie reprezentowane mułki, z soczewkami mułków szarozielonych. Średnia miąższość tych utworów w złożu wynosi około 8 m, zaś nadkład utworów czwartorzędowych nie przekracza 1 m. Skład fazowy badanych próbek jest podobny. Podstawową masę czerwonej kopaliny ilastej tworzy mniej lub bardziej jednorodna mieszanina substancji ilastej oraz pobocznie - składników klastycznych. Towarzyszy im podrzędnie czerwonobrunatny pelit hematytowy, który pigmentuje substancję ilastą. Minerały ilaste są reprezentowane głównie przez illit i kaolinit. Cechą charakterystyczną badanych iłów jest występowanie w nich podrzędnej ilości minerałów ilastych o podstawowym refleksie rentgenowskim 14 A (przypuszczalnie wermikulit i/lub minerały mieszanopakietowe wermikulit/chloryt oraz chloryt/smektyt). Skład mineralny badanych próbek uzupełniają minerały nieilaste, przede wszystkim kwarc i hematyt, a także zmienne ilości mik, skaleni (zarówno plagioklazów jak i K-skaleni) oraz niekiedy - podrzędne ilości kalcytu.
    The ceramic clays occurring in the Szkucin deposit are of Upper Triassic age. They are developed as red-brownish clays, loams and inferiorly muds with lenses of grey-green muds. An average thickness of these sediments in the deposit is about 8 m, whereas that of the Quaternary overburden does not exceed 1 m. The phase composition of the clays studied is similar. The clayey material is composed mainly of amore or less homogenous mixture of clay substance containing minor amounts of detrital components and finely dispersed hematite pelite that colours the clay material in red. Clay minerals are represented mostly by illite and kaolinite. The presence of minor admixtures of 14 A clay minerals (probably vermiculite and/or mixed-layered vermiculite/chlorite and chlorite/smectite) is characteristic. Beside clay minerals, the list of components includes quartz and hematite, accompanied by minor and variable amounts of micas, feldspars (both plagioclases and K-feldspars) and, sometimes, calcite. On the basis of detailed chemical and mineralogical investigations, the authors have delineated within the deposit its part without calcite, i.e., representing the material with the best properties from the point of view of the requirements of the ceramic industry. Fast firing in the range 1110-1140°C indicates that the raw material is suitable for manufacturing the monoporosa wall tiles, whereas after the firing in the range 1150-1180°C it can be used in manufacturing the monocottura stoneware floor tiles. Thus, the red, non-calcareous clays from Szkucin meet the requirements of the mineral raw material applicable in the ceramic industry, particularly in manufacturing various types of tiles.
    Źródło:
    Gospodarka Surowcami Mineralnymi; 2010, 26, 3; 5-20
    0860-0953
    Pojawia się w:
    Gospodarka Surowcami Mineralnymi
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Expanded perlite, expanded vermiculite and microspheres as fillers in new generation paper pulp mixtures used for contact with liquid metal
    Autorzy:
    Zawieja, Z.
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/101866.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    expanded perlite
    expanded vermiculite
    microspheres
    paper pulp
    Opis:
    Liquid metal when filling sand casting mould while pouring it out from ladle at the first moment comes across the sprue/gate system of the mould the purpose of which is to transfer liquid metal and feed the mould recess. The materials presently used for the elements of the sprue/gate systems are based on ceramics or the mixtures based on paper pulp. In this study the use of alternative mineral additions such as expanded perlite, expanded vermiculite, and microspheres as the fillers to paper pulp acquired from waste-paper for the use for the elements of mould sprue/gate systems or also other applications for the contact with liquid metal are presented. Experimental mould tube shapes made on the basis of the paper pulp based mixture patented by the authors were poured over with liquid metal. For the comparison, ceramic shapes and commercially available cellulose shapes were investigated in the same way. In order to compare the crystallization processes, a measurement of the cooling off liquid metal was carried out for all the analysed tube samples. From the so obtained metal samples metallographic microsections were made to compare cast iron microstructures. The results obtained from the investigations carried out have shown that the patented paper pulp based mixture may well be applied as an alternative material used for the elements of the sprue/gate systems for disposable sand moulds.
    Źródło:
    Advances in Science and Technology. Research Journal; 2015, 9, 26; 83-88
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Qualitative Analyses of Gas Evolution from Modified Cellulose Mixtures During Thermal Degradation in Air and Argon
    Autorzy:
    Zawieja, Z.
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/102348.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    expanded perlite
    expanded vermiculite
    microspheres
    cellulose mixture
    mass spectrometry
    Opis:
    This paper presents the application of mineral additives, such as expanded perlite, expanded vermiculite and microspheres in items used in founding. Mixed with paper pulp and aluminosilicate resin as a binder, these additives are the base of a mixture patented by the authors, which can be used in the production of pipe shapes and connectors with a circular cross-section in casting systems in the founding industry. These mixtures were subjected to TG thermal degradation during which a quantitative analysis of the emitted fumes was carried out. The analysis did not detect any other compounds than those formed by the combustion of cellulose materials, which indicated that no chemical reaction took place between the applied additives and cellulose at high temperatures.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 3; 24-30
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermogravimetric analysis of modified cellulose mixtures in air
    Autorzy:
    Zawieja, Z.
    Sawicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/352521.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    expanded vermiculite
    expanded perlite
    modified cellulose mixture
    TG/DTG analysis
    Opis:
    The paper includes the TG-DTG thermogravimetric air-testing of a cellulose mixture modified with the additives of expanded vermiculite or expanded perlite. A thermal degradation test was carried out at 1000°C with a simultaneous qualitative analysis of the emitted gases. During the thermal degradation process, the thermal effects were also measured. The research results indicate that expanded vermiculite or expanded perlite do not emit toxic gases during thermal degradation. The cellulose mixture modification, with the additives of expanded vermiculite or perlite, does not result in the creation of new gaseous compounds in the process of thermal degradation. As investigated below, the mixtures tested in this article find application in gating systems for supplying liquid metal in no-bake moulds. Such cellulose-based material solutions shall allow the foundry industry to introduce less gas vaporising technologies within the entire casting production process.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 153-157
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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