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    Wyświetlanie 1-4 z 4
    Tytuł:
    Setting Time and Compressive Strength of Geopolymers Made of Three Indonesian Low Calcium Fly Ash with Variation of Sodium Silicate Addition
    Autorzy:
    Hidayati, Ririn Eva
    Faradilla, Fitria Sandi
    Dadang, Dadang
    Harmelia, Lia
    Nurlina, Nurlina
    Prasetyoko, Didik
    Fansuri, Hamzah
    Powiązania:
    https://bibliotekanauki.pl/articles/2049135.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fly ash
    geopolymer
    sodium silicate
    low calcium
    waste management
    Opis:
    In this research, the effect of sodium silicate (Na2SiO3) on the geopolymerization of fly ash type F (low calcium) has been studied. the variations of Na2SiO3 used in the synthesized geopolymers were 19, 32, and 41wt%. the fly ash from three different power plant sources was characterized using X-Ray Fluorescence (XRF), X-Ray diffraction (XRD), Particle Size Analyzer (PSA), and Scanning Electron Microscopy (SEM). Fly ash-based geopolymers were tested for mechanical strength and setting time. the best geopolymer was obtained by adding 32% Na2SiO3, produced a compressive strength of 21.62 MPa with a setting time of 30 hours. additions of 19wt% Na2SiO3 failed to form geopolymer paste while the addition of 41wt% Na2SiO3 decreased the mechanical strength of the geopolymer. Higher calcium content in low calcium fly ash produces stronger geopolymer and faster setting time.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1115-1121
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The depression mechanism on pyrite in a low-alkaline system with combined depressants : Experiment, HSC, DFT and ToF–SIMS studies
    Autorzy:
    Li, Suqi
    Yuan, Jiaqiao
    Ding, Zhan
    Li, Jie
    Yu, Anmei
    Wen, Shuming
    Bai, Shaojun
    Powiązania:
    https://bibliotekanauki.pl/articles/24085821.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pyrite
    calcium hypochlorite
    lime
    depression
    low alkaline system
    Opis:
    Depression of pyrite in a low-alkaline system has sparked soaring interests for the multi-metal sulfide minerals flotation recently. This study investigates effects of combined depressants (Ca(ClO)2 and CaO) on pyrite flotation with butyl xanthate (KBX). Micro-flotation experiments indicate that the addition of 200 mg/L combined depressants (a mass ratios of CaO to Ca(ClO) 2 of 2:3) and 1.0×10−3 mol/L KBX at pH 9.5 can effectively depresses the flotation of pyrite, and a minimum pyrite recovery rate of 12.5% is obtained. Basic thermodynamic evaluation results confirm the participation of Ca(ClO) 2 significantly decrease the negative Gibbs free energies of pyrite oxidation reaction. Besides, the calcium species (Ca(OH) 2, Ca2+ and Ca(Cl) 2) will spontaneously transform into CaCO3,and it is the ultimate dominant calcium species in the CO32- system. Density functional theory (DFT) results indicate that CaCO3 can chemically adsorb onto the pyrite surface with an adsorption energy of –671.13 kJ/mol. The O1 and Ca atoms mainly contribute to the bonding process and are responsible for the stable adsorption of CaCO3. ToF-SIMS results provide strong evidence that the combined depressants increase the amount of hydrophilic species and decrease dixanthogen adsorption onto the pyrite surface. The thickness of the whole formed hydrophilic species is approximately 50 nm. Semiquantitative amounts of hydrophilic species follow the order of hydroxy calcium>iron carbonyl>calcium carbonate. Overall, hydrophilic species repulse adsorption of dixanthogen and significantly reduce the flotation performance of pyrite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168454
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seedling growth, root development and nutrient use efficiency of Cypress clones in response to calcium fertilizer
    Autorzy:
    Zhang, Z.
    Jin, G.
    Zhou, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078194.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Cupressus funebris
    root development
    nutrient accumulation efficiency
    calcium response
    fertile
    soil
    low fertility soil
    Opis:
    Cypress (Cupressus funebris Endl.) is an important tree species in the subtropical regions of China; it is also a major tree species for afforestation and forest land restoration under low-fertility soil conditions. Cypress is considered a calcicolous tree, and its growth and development can be promoted significantly by exchangeable calcium (Ca2+) in the soil. However, most of the subtropical regions have low-fertility acidic soils, in which Ca2+ gradually becomes a limiting element for Cypress growth. In this study, different concentrations of Ca2+ fertilizer were added under fertile soil (3 g kg−1 NPK fertilizer added) and low-fertility soil (0 g kg−1 NPK fertilizer added) conditions. Cypress clones responded differently to Ca2+ addition in different soil conditions. The seedling height and dry matter quality of Cypress in fertile soil were significantly greater than those in low-fertility soil, but plant height and dry biomass did not differ significantly among Ca2+ treatments. The accumulation efficiencies of nitrogen (N), phosphorous (P) and Ca all differed significantly among the Ca2+ treatments. In low-fertility soil, the addition of 3 g kg-1 Ca2+ significantly promoted development of roots 0.5–2 mm in diameter, and both the C1 and C2 clones achieved their highest N, P and Ca accumulation efficiencies. When the Ca2+ concentration increased to 6 g kg−1, the seedling height, dry matter quality and root development were lower than those of the 3 g kg−1 Ca2+ treatment. In the fertile soil, the addition of Ca2+ significantly inhibited development of roots 0.5–1 mm in diameter. The highest N accumulation efficiency was achieved under the 0 g kg−1 Ca2+ treatment, and the highest Ca accumulation efficiency was achieved under the 6 g kg−1 Ca2+ treatment. Seedling height, root dry weight, roots 0–1.5 mm in diameter and Ca accumulation showed a significant interaction effect between NPK fertilizer and Ca2+. Therefore, Ca accumulation was more efficient in low-fertility soils. Under low-fertility soil conditions, the addition of CaSO4 can promote the root development of seedlings and advance and prolong the fast growth period of seedling height. Cypress clones can be used as an important tree species for afforestation under low-fertility soil conditions, especially under calcareous soil conditions.
    Źródło:
    Dendrobiology; 2020, 84
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prostaglandins and arterial wall lipid metabolism - in vitro, ex-vivo and in vivo radioisotopic studies
    Autorzy:
    Sinzinger, H
    Rogatti, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/69328.pdf
    Data publikacji:
    1994
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    metabolism
    prostaglandin
    lipid
    calcium antagonist
    in vivo
    lipid metabolism
    radioisotopic study
    in vitro
    hypercholesterolemia
    low density lipoprotein
    atherosclerosis
    Źródło:
    Journal of Physiology and Pharmacology; 1994, 45, 1
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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