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    Wyświetlanie 1-4 z 4
    Tytuł:
    Carbonised fluidised fly ash (CFFA); a new product for mining engineering purposes (discussion of possible applications)
    Autorzy:
    Łączny, Marian Jacek
    Rompalski, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/2201409.pdf
    Data publikacji:
    2022
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    fluidized fly ash
    carbonation
    mining engineering
    popiół lotny fluidalny
    karbonizacja
    inżynieria górnicza
    Opis:
    The article presents and summarises the current state of research and laboratory results on the carbonation of fly ash with carbon dioxide in the context of its use in mining engineering. Based on previous publications and patent applications, the possibilities of using carbonated fly ash from fluidised bed boilers for the following applications were discussed: securing excavations particularly susceptible to fire hazards, shotcreting and securing longwalls and supports, constructing cases, securing decommissioned shafts, and others, which means wherever the use of cement is required. It was pointed out that the removal of excess free calcium oxide makes it possible to use carbonated fly ash in mining applications for placement in workings requiring increased tightness. It was also stated that carbonation allows the removal of hydrogen from fluidised fly ash (FFA) obtained during co-combustion. The research highlighted the potential and importance of granulating carbonised FFA in expanding the applications of this innovative product in mining engineering.
    Źródło:
    Journal of Sustainable Mining; 2022, 21, 3; 191--199
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the possibility of using granulated carbonated volatile fly ash from fluidized beds (G-CVFA) in underground mining techniques
    Autorzy:
    Proksa, Jadwiga
    Łączny, Marian Jacek
    Bzowski, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/1853850.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluidalny popiół lotny
    karbonizacja
    technika górnicza
    fluidized fly ash
    underground mining techniques
    carbonation
    granulation
    Opis:
    The application of fluidized fly ash in underground mining excavations is limited due to its significant content of free calcium and calcium sulfate. In order to increase the amount of utilized fly ash from fluidized beds, it should be converted to a product with properties that meet the requirements for mining applications. This research presents the results of an attempt to adapt fluidized fly ashes for use in underground mining techniques, by means of carbonation and granulation. Carbonation was performed with the use of technical carbon dioxide and resulted in the reduction of free calcium content to a value below 1%. Granulation on the other hand, resulted in obtaining a product with good physical and mechanical parameters. The performed mineralogical and chemical studies indicate that trace amounts of "binding" phases, such as basanite and/or gypsum are present in the carbonized ash. The addition of water, during the granulation of carbonized fluidized fly ash, resulted in changes in the mineral phases leading to the formation of ettringite and gypsum as well as the recrystallization of the amorphous substance. It was confirmed that the carbonization and granulation of flying fluidized ashes positively affects the possibility of using these ashes in underground mining excavations.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 4; 737-750
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametry wytrzymałościowe fluidalnego popiołu lotnego z Elektrowni „Połaniec”
    Mechanical Properties of Fluidized Fly Ash from Power Station “Połaniec
    Autorzy:
    Gruchot, A.
    Zydroń, T.
    Gałowicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818638.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    fluidalny popiół lotny
    wytrzymałość na ścinanie
    wskaźnik nośności CBR
    wytrzymałość na ściskanie
    budownictwo drogowe
    fluidized fly ash
    shear strength
    CBR ratio
    compressive strength
    road construction
    Opis:
    Production of electricity and heat energy in Poland is largely based on the combustion of coal and lignite in power plants. Combustion of coal is associated with the production of significant quantities of wastes. Given the possibilities of their using, the most important product of combustion is fly ash and recently – fluidized fly ash. Tests on properties of fluidized fly ash are mainly focused on determining the impact of its addition on the mechanical properties of concrete or the setting time of self-hardening slurries, while little is known about its mechanical parameters. The aim of the study was to determine the impact of density, moisture content and maintenance duration on shear strength, CBR ratio and compressive strength of fluidized fly ash from Power Plant "Połaniec". The study was performed in terms of assessing their possibility of use for the purpose of road construction. CBR ratio was determined at three various values of moisture content determined from compaction curve of the fly-ash. CBR ratio tests were done for samples directly after compaction and after 4 days of the soaking in water. Shear strength was determined in a direct shear apparatus on samples compacted at a moisture content close to the optimum and three values of the compaction index IS = 0.90, 0.95 and 1.00. Determination of compressive strength was carried out on samples immediately after preparation and after 7, 14, 28 and 42 days of air, air-water and air-water maintenance process including 3, 7, and 14 cycles of freezing and de-freezing. The results revealed that in accordance with the geotechnical nomenclature the tested fluidized fly-ash's grain-size distribution corresponds to sandy silts. The fly-ash has high value of maximum dry density. CBR ratio of fly-ash samples after 4 days of soaking in water were very high and ranged from 199 to 277%. It can be underline that in case of both tests series, the obtained CBR indexes were positively correlated with increasing initial moisture content of tested samples. The parameters of the shear strength were high. It was stated that the higher values of compaction indexes, the higher values of the angle of internal friction and cohesion were obtained. The compressive strength of samples was high, ranging from over 2.2 MPa to approximately 6.0 MPa. The largest increase in strength was obtained after 7 days of maintenance. The maximum values of compressive strength after 42 days of maintenance, were obtained for samples which were subjected to air and air-water maintenance process. Freeze-thaw resistance index value obtained for a short 3 cycles of freezing and de-freezing process was greater than 1.0, which means that tested fly-ash was not prone to freezing process. Increasing number of freezing and de-freezing cycles affected the freeze-thaw resistance index value, which was well below 1.0, indicating a significant loss of compressive strength. To sum up, the test results on the fluidized fly ash from Power Plant "Połaniec" revealed that the fly-ash has good compaction properties, bearing capacity and shear strength. In contrast, the particle size of the fly-ash is unfavorable from the viewpoint of its use in road embankments. In turn, the results of the CBR and compressive strength tests confirmed the presence of hydration properties of fluidized fly ash thus indicating the possibility of its use in road hydraulic binders.
    Źródło:
    Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 2; 1622-1641
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie odpadów z przemysłu ceramicznego, energetycznego i budowlanego w technologii adsorpcji
    Utilization of waste from the ceramic, energy and construction industry in adsorption technology
    Autorzy:
    Siemiątkowski, G.
    Nolepa, A.
    Kiprian, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/392260.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
    Tematy:
    odpad przemysłowy
    wykorzystanie odpadów
    proszek ceglany
    popiół fluidalny
    popiół denny
    popiół z bocznikowania
    właściwości sorpcyjne
    adsorpcja metali ciężkich
    industrial waste
    waste utilization
    brick powder
    fluidized fly ash
    bottom ash
    bypass dust
    sorption properties
    heavy metal adsorption
    Opis:
    Artykuł jest opisem doświadczenia mającego na celu weryfikację możliwości wykorzystania pyłów ceglanych, popiołów lotnych i odpadów dennych ze spalania węgla brunatnego czy pyłów z bypassa, pochodzących z linii wypalania klinkieru w technologii adsorpcji metali ciężkich w środowisku wodnym. Wszystkie te materiały nie znajdywały dotychczas użytecznego wykorzystania, stanowiąc istotny balast odpadowy. Osiągnięte wyniki badań należy uznać za bardzo obiecujące. Analizowane odpady w opisanych w artykule warunkach doświadczenia wykazywały bardzo dobre właściwości sorpcyjne – w większości przypadków sięgające co najmniej 82% skuteczności. Na uwagę zasługuje również trwałość wiązań sorpcyjnych. Uzyskana w doświadczeniu desorpcja metali ciężkich w większości przypadków była znikoma. Pozytywne wyniki badań dają nadzieję na rychłe znalezienie użytecznego wykorzystania dla analizowanych odpadów.
    The article is a description of the experience aimed at verifying the possibility of using brick dust, fly ash and bottom waste from lignite combustion or bypass dust, which came from the clinker firing line in the technology of adsorption of heavy metals in the water environment. All these materials have not yet found useful use, constituting a significant waste ballast. The research results achieved should be considered very promising. The analyzed waste in the experimental conditions described in the article showed very good sorption properties – in most cases reaching at least 82% of effectiveness. Noteworthy is the durability of sorption bonds. The desorption of heavy metals obtained in the experiment was, in most cases, insignificant. Positive research results give hope for prompt finding of useful use for the analyzed waste.
    Źródło:
    Prace Instytutu Ceramiki i Materiałów Budowlanych; 2017, R. 10, nr 31, 31; 51-69
    1899-3230
    Pojawia się w:
    Prace Instytutu Ceramiki i Materiałów Budowlanych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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