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    Wyświetlanie 1-7 z 7
    Tytuł:
    Substitution mechanism of rare earths at fluorapatite characteristic sites : experimental and computational calculations
    Autorzy:
    Xie, Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/24085936.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rare earth
    phosphorite
    doping
    electronic properties
    computational calculations
    Opis:
    Rare earths (REs) containing phosphate rock is a potential REs resource. The unclear occurrence mechanism of REs in phosphorite limits its further development and utilization. Fluorapatite (FAP) is the main REs-bearing target mineral in phosphorite, the microscopic mechanism of REs entering FAP still needs to be further studied from the electronic scale. In this paper, the doping mechanism of REs in FAP was studied by experiment combined with GGA+U calculation. The XRD, SEM, and FT-IR characterization results of hydrothermal synthesis products showed that REs (La, Ce, Nd, and Y) entered FAP crystal, and one of every 20 Ca atoms was replaced by a REs atom. The GGA+U calculation indicated that La-O/F, Ce-O/F, Nd-O/F, and Y-O/F were ionic bonds in general, and the bonding strength of La-O/F, Ce-O/F, Nd-O/F, and Y-O/F increased gradually with atomic number. The substitution difference of La, Ce, Nd, and Y was mainly caused by the gain and loss of electrons in f and d orbitals. The substitution mechanism of REs at the characteristic sites of Fap was studied, which provided a theoretical reference for the selective recovery of REs from phosphorus blocks.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 163418
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation separation of quartz from phosphorite using an imidazole ionic liquid collector and its adsorption mechanism
    Autorzy:
    Zhao, Yuanyuan
    Xu, Wei
    Mei, Guangjun
    Yu, Mingming
    Yang, Siyuan
    He, Zhan
    Powiązania:
    https://bibliotekanauki.pl/articles/2146857.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    reverse flotation
    imidazole ionic liquid
    desilication
    phosphorite
    quartz
    Opis:
    In this study, an imidazole ionic liquid (dodecyl-tri-methylimidazolium chloride) was employed as a collector to separate quartz from phosphorite. The micro-flotation experiments of a single mineral found that it had selective collecting ability for quartz than phosphorite. Mixed mineral flotation experiments confirmed that efficient separation results could be obtained using the imidazole ionic liquid as the collector. A concentrate with a 31.44% grade of phosphorite could be obtained with a 0.285 kg/Mg collector dosage at neutral pH, which was much better than the traditional collector dodecylamine. The adsorption mechanism of the imidazole ionic liquid on the surface of phosphorite and quartz was investigated by contact angle and zeta potential measurements, Fourier transform infrared and X-ray photoelectron spectroscopy analyses. These results showed that the adsorption of imidazole ionic liquid at the quartz surface was stronger than that of phosphorite, and the collector adsorbability difference between quartz and phosphorite resulted in the efficient flotation separation. Consequently, the dodecyl-tri-methylimidazolium chloride salt is an effective collector for reverse flotation of quartz from phosphorite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 1; 159--168
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of the solubility of rock phosphate by co-composting it with organic components
    Autorzy:
    Korzeniowska, J.
    Stanisławska-Glubiak, E.
    Hoffmann, J.
    Górecka, H.
    Jóźwiak, W.
    Wiśniewska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/949430.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    compost
    straw
    sawdust
    beet pulp
    phosphorite
    phosphorus availability to plants
    Opis:
    One possible way to improve the solubility of phosphate rock is by co-composting it with organic substances. Four variants of composts were made in a biomass composting bioreactor. Ground phosphate rock (GPR) and shredded barley straw, pine sawdust as well as beet pulp pellets were used as compost components. The four composts were different from one another in the type and amount of organic components. The composts were granulated in a pelleting press. Changes in the solubility of phosphorus were assessed via chemical analyses and P-recovery efficiency calculated from the data achieved in a pot experiment. Solubility of ground phosphate rock was increased resulting from co-composting with organic substances, which meant that bioavailability of phosphorus increased. All the tested composts were characterized by a higher ratio of ammonium citrate soluble phosphorus to total phosphorus than non-composted GPR. Co-composting GPR with all the tested organic components yielded better effects than composting it with straw alone. The four composts were characterized by a slow release of P, which justifies our expectation that they will produce residual effects in the years following their application.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 4; 10-14
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing of phosphorites with extraction of phosphorus, obtaining calcium carbide and ferroalloy
    Autorzy:
    Shevko, Victor M.
    Uteyeva, Raisa A.
    Badikova, Alexandra D.
    Tleuova, Saltanat T.
    Powiązania:
    https://bibliotekanauki.pl/articles/27323638.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    phosphorite
    thermodynamic modeling
    electrical melting
    phosphorus
    calcium carbide
    ferroalloy
    Opis:
    The article considers the results of studying the thermodynamic computer modeling of the interaction of phosphorite (Karatau basin, Kazakhstan) with carbon and coke performed using the HSC-10 software package and electric smelting of the phosphorite with coke and steel shavings in an arc furnace. The modeling allowed us to determine the equilibrium extraction degrees of phosphorus into gas (Р2, Р4), silicon into ferroalloy in the form of iron silicides (FeSi2, FeSi, Fe3Si, Fe5Si3, Si) and calcium into CaС2. At temperatures above 1500 °C, regardless of the amount of iron, the extraction degree of phosphorus into gas is more 99%. The resulting ferroalloy contains 21.2-23.8% of Si, 1.6-2.8% of Al; the calcium carbide has a capacity of 288-325 dm3/kg. The extraction degree of silicon into the alloy was 89.8%, calcium in CaC2 – 72.5%, phosphorus into gas – 99.4%. The ferroalloy, formed at the electric smelting of the Chulaktau phosphorite together with coke and steel shavings and containing 24.9-29.8% of Si, is FS25 grade ferrosilicon, and the formed calcium carbide has a capacity of 278-290 dm3/kg and belongs to the third and second grades. The developed technology makes it possible to increase the degree of phosphorites’ comprehensive use two times (up to 87.5%).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174463
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dolnokredowe fosforyty z NE obrzeżenia Gór Świętokrzyskichjako potencjalne źródło REE : badania wstępne
    Lower Cretaceous phosphorites from the NE marginof the Holy Cross Mountains as a potential source of REE : preliminary study
    Autorzy:
    Zglinicki, Karol
    Szamałek, Krzysztof
    Salwa, Sylwester
    Górska, Irena
    Powiązania:
    https://bibliotekanauki.pl/articles/2076076.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    rzadkie elementy ziemi
    fosforyt
    frankolit (CAF)
    pseudoguzki
    Góry Świętokrzyskie
    rare earth elements
    phosphorite
    francolite (CAF)
    pseudonodules
    Holy Cross Mountains
    Opis:
    The PGI-NRI conducts geological research on the documentation of occurrence of REE deposits in Poland. The deposit potential may be related to the formation of Lower Cretaceous phosphorites from the NE margin of the Holy Cross Mountains. Two phosphorite deposits were exploited in this region in the past: Chałupki (1936-1959) and Annopol (1952-1970). From the Chałupki old mine dump, 34 samples of fine-grained sand were collected. The pseudonodules were extracted from this sand. The sand from the dump is composed of quartz, francolite (carbonate-rich fluorapatite) Ca5(PO4,CO3)3F, illite and a small amount of feldspar, calcite and heavy minerals. The heavy fraction is composed of zircon, monazite and rutile. Sand has a low content of REE ranging from 47.56 to 185.26ppm. The phosphorite pseudonodules underwent a detailed mineralogical and chemical analysis. They are composed of francolite, quartz, illite, glauconite, feldspar and minor heavy minerals: zircon and monazite. For the first time, the whole spectrum of REE was analysed in pseudonodules. The I.REE content in the nodules ranges from 177.37 to 354.18ppm. This level of REE indicates a serious need for further exploration and research of phosphorite pseudonodules within the whole Lower Cretaceous phosphorite series and moreover, also in the Eocene phosphorite formation in the Lublin region.
    Źródło:
    Przegląd Geologiczny; 2020, 68, 7; 566--576
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicified and phosphatized Tianzhushania, spheroidal microfossil of possible animal origin from the Neoproterozoic of South China
    Autorzy:
    Yin, C
    Bengtson, S.
    Yue, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/20023.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    benthic form
    China
    Tianzhushania
    phosphorite
    animal origin
    Doushantuo Formation
    Megasphaera
    Tianzhushania tuberifera
    chert
    spheroidal microfossil
    Metazoa
    Tianzhushania ornata
    Megasphaera ornata
    Neoproterozoic
    rock matrix
    Opis:
    Comparative study of microfossils from two kinds of sediments: chert intercalations (studied in thin section) and phosphorite/phosphatic carbonate (in thin section and maceration), from the upper Neoproterozoic Doushantuo phosphorites in the Weng’an area, Guizhou Province, South China, shows that the phosphatized Megasphaera ornata and the chert−preserved Tianzhushania tuberifera should be regarded as representing the same taxon preserved by different mineralization processes. In phosphatized specimens the outer wall is often peeled off, exposing the ornamented middle wall. Some phosphatized specimens isolated from the rock matrix and specimens seen in thin sections of phosphorites show a partly preserved outer wall with spines, which can be compared to the thin−sectioned specimens from the chert beds. The small pits usually seen on the surface of the ornamented middle wall of phosphatized specimens correspond to the attachment spots of the spines in the outer wall. The presence of a spiny outer wall is a characteristic of Tianzhushania Yin and Li, 1978. Tianzhushania ornata (Xiao and Knoll, 2000) comb. nov. is here proposed as the valid name for the species. The proposed resting−egg nature of T. ornata, mainly based on the ornament type of the middle wall, cannot be excluded. The presence of a spiny outer wall, however, suggests that it is a pelagic rather than a benthic form.
    Źródło:
    Acta Palaeontologica Polonica; 2004, 49, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ związków fosforu zawartych w osadach ściekowych na wzrost rzepaku
    Impact of the addition of phosphorus compounds contained in sewage sludge on the growth of rapeseed Brassica napus L. ssp. napus
    Autorzy:
    Pyrak, M.
    Worwąg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/297373.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    phosphorus
    phosphorite
    natural fertilizers
    natural phosphorus raw materials
    sewage sludge
    waste management
    sewage sludge management
    fosfor
    fosforyty
    nawozy naturalne
    naturalne surowce fosforu
    osady ściekowe
    gospodarka odpadami
    zagospodarowanie osadów ściekowych
    Opis:
    Phosphorus is an element frequent in natural environment. It is necessary for the proper functioning of plants. Throughout the world are used phosphate fertilizers to improve soil quality in crop fields to create the best conditions for plant breeding. This fertilizers are produced from phosphate rock, whose high rate of exploitation may lead to depletion of natural phosphorus deposits over the next several decades. Therefore, there is an increasing interest in the effective use of waste containing large amounts of phosphorus compounds, which include sewage sludge. The main goal was to analyze the effect of the addition of phosphorus compounds contained in sewage sludge and mineral fertilizer on the growth and biomass of rapeseed Brassica napus L. ssp. napus. The essence of research was a 4-week, sterile culture of in vitro rapeseed on media prepared from soil extracts with the addition of mineral fertilizer and sewage sludge from “WARTA” wastewater treatment. At the end of breeding, a plant analysis was carried out in terms of the amount of seeds sprouted, length, weight and percentage of water content in above-ground parts and rapeseed roots. The obtained results indicate that sewage sludge, both in comparison to the control sample as well as the sample with mineral fertilizer, had a positive effect on the germination rate and overall plant growth. Compared sample with control sample, the aboveground parts in sample with addition of sewage sludge were longer on average 2.7 cm, they had a larger mass on average 0.1 g and it was better hydrated about 0.9%. Roots also were longer on average 9.4 cm and have larger mass on average 0.03 g.
    Fosfor jest pierwiastkiem biogennym niezbędnym do prawidłowego wzrostu roślin. Na całym świecie stosuje się nawozy fosforowe w celu polepszenia jakości gleby na polach uprawnych, aby stworzyć jak najlepsze warunki do hodowli roślin. Nawozy są wytwarzane z fosforytów, których wysokie tempo eksploatacji może doprowadzić do wyczerpania naturalnych złóż fosforu w ciągu najbliższych kilkudziesięciu lat. Dlatego wzrasta zainteresowanie w dziedzinie efektywnego wykorzystania odpadów o dużej zawartości związków fosforu, do których należą m.in. osady ściekowe. Celem pracy jest analiza wpływu dodatku związków fosforu zawartych w osadach ściekowych i nawozie mineralnym na wzrost i biomasę rzepaku Brassica napus L. ssp. napus. Istotę badań stanowi 4-tygodniowa, sterylna hodowla in vitro rzepaku na pożywkach sporządzonych z wyciągów glebowych z dodatkiem nawozu mineralnego oraz osadów ściekowych pochodzących z Oczyszczalni Ścieków „WARTA”. Po zakończeniu hodowli analizę roślin przeprowadzono pod względem liczby wykiełkowanych nasion, długości, masy oraz procentowej zawartości wody w częściach nadziemnych i korzeniach rzepaku. Z uzyskanych wyników wywnioskowano, że osady ściekowe, zarówno w porównaniu z próbą kontrolną, jak i z próbą z nawozem mineralnym, mają pozytywny wpływ na szybkość kiełkowania i ogólny rozwój roślin. W porównaniu z próbą kontrolną części nadziemne roślin są dłuższe o średnio 2,7 cm, posiadają większą o średnio 0,1 g masę oraz są lepiej uwodnione o ok. 0,9%. Korzenie również są dłuższe o średnio 9,4 cm oraz charakteryzują się zwiększoną masą o około 0,03 g.
    Źródło:
    Inżynieria i Ochrona Środowiska; 2018, 21, 1; 67-78
    1505-3695
    2391-7253
    Pojawia się w:
    Inżynieria i Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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