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    Wyświetlanie 1-4 z 4
    Tytuł:
    Investigation on different behavior and mechanism of Ca(II) and Fe(III) adsorption on spodumene surface
    Autorzy:
    Yu, F.
    Wang, Y.
    Wang, J.
    Xie, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/110230.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    spodumene surface
    calcium ions
    iron ions
    adsorption mechanism
    DFT calculation
    Opis:
    Behavior and mechanism of Ca2+ and Fe3+ adsorption on spodumene surface were investigated by micro flotation tests, zeta potential measurements, and density functional theory (DFT) calculation methods. The micro flotation tests showed that Ca2+ and Fe3+ activated the flotation of spodumene remarkably. However, the effect of Fe3+ was more significant than that of Ca2+. Additionally, Fe3+ significantly changed the zeta potential of spodumene while Ca2+ showed a little change. Meanwhile, the calculated adsorption energy of Fe3+ on spodumene surface was much greater than that of Ca2+ indicating that Fe3+ is more apt to be adsorbed on spodumene surface than Ca2+. The value of bond population in Ca-O illustrated that the bond of Ca-O consists of partial covalent proportion and some ionic component. On the contrary, the bond of Fe-O showed a relatively strong covalent property. The partial density of states (PDOS) of free Ca/Fe and the reacted O atom on spodumene (110) surface before and after the adsorption showed that Fe 3d orbital and O 2p orbital formed hybridization. The density of states (DOS) near the Fermi level of spodumene surface after adsorption with Fe3+ was much stronger than that with Ca2+.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 2; 535-550
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving spodumene flotation using a mixed cationic and anionic collector
    Autorzy:
    Wang, Y.
    Zhu, G.
    Yu, F.
    Lu, D.
    Wang, L.
    Zhao, Y.
    Zheng, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/109883.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    spodumene
    lithium
    silicates
    flotation
    anionic surfactant
    cationic surfactant
    Opis:
    Lithium, a rare-earth element, has been in increasing demand. Spodumene flotation is an important and challenging step for lithium extraction and production from lithium ore. In the present work, flotation tests for three pure minerals (i.e., spodumene, quartz and feldspar) and a real spodumene ore were carried out at laboratory scale. The results showed that YOA, a mixture of oleic acid and dodecylamine with the molar ration of 10:1, could be used as collector to produce a spodumene concentrate with grade of 5.59% Li2O from the feed ore with grade of 1.48% Li2O where 85.24% of Li2O was recovered to the concentrate. The measured zeta potential, contact angle and adsorption capacity indicated that YOA was preferentially adsorbed on spodumene instead of on quartz or feldspar, with the spodumene surface being more hydrophobic than that of feldspar or quartz. The adsorption energies of YOA on spodumene were calculated and the results provided insights into the superior flotation performance obtained in the present work.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 567-577
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of spodumene leaching with sodium hydroxide on its flotation
    Autorzy:
    Yu, F.
    Wang, Y.
    Zhang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/110505.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    spodumene
    flotation
    preferential leaching
    XPS analysis
    Opis:
    Effects of NaOH on flotation of spodumene, quartz and feldspar using oleic acid as a collector were investigated through microflotation and bench scale flotation tests. It was determined that NaOH acted more than a pH regulator in the tests. The X-ray photoelectron spectroscopy revealed that spodumene was preferentially leached by conditioning with high concentration of NaOH in the solution and exposed more Li positive sites on the mineral surface leading to an improved flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 745-754
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania mineralogiczno-gemmologiczne oraz mikrotermometryczne spodumenów z kopalni Nilaw (Laghman, NE Afganistan)
    Mineralogical-gemological and microthermometric studies of spodumenes from the Nilaw mine (Laghman Province, NE Afghanistan)
    Autorzy:
    Natkaniec-Nowak, L.
    Słowakiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074773.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    zielone spodumeny
    kunzyt
    inkluzje stałe i płynne
    Nilaw
    Afganistan
    green spodumene
    kunzite
    solid and fluid inclusions
    Afghanistan
    Opis:
    The aim of the study was mineralogical-gemological and microthermometric analysis of color types of spodumenes (green spodumenes, kunzite) from the Nilaw mine (Laghman Province, Afghanistan). These minerals contain numerous fluid inclusions, both primary and secondary, as well as mineral ones. The analyses of fluid inclusion assemblages (FIA) in green spodumenes showed of temperatures of homogenization (into vapor phase) of carbon dioxide (ThCO2) varing from 27.1 to 27.8°C and total homogenization temperatures (ThTOT) of 252–271°C. Temperature of crystallization after correction varies from 370 to 430°C and pressure - from 1.16 to 1.44 kbar. Composition of brines (in mol%): H2O = 0.93–0.94, CO2 = 0.027–0.038, NaCl = 0.029-0.032, with salinities from 4.33 to 6.59 wt.% NaCl eq. was also calculated. For FIAs in kunzite, temperatures of homogenization of carbon dioxide (ThCO2) range from 27.0 to27.3°C, whereas total temperatures of homogenization (ThTOT) is 238–250°C. Values of Tcr are 300–334°C and Pcr - 0.81–1.12 kbar. Composition of brines (in mol%) is: H2O = 0.57–0.75, CO2 = 0.22–0.40, NaCl ca 0.02; and salinity 4.5–5.7 wt. % NaCl eq. The obtained results show that the studied minerals precipitated from medium-temperature and low-pressure hydrothermal solutions varying in chemical composition. New Polish terminology for English equivalents regarding petrography of fluid inclusions was also proposed.
    Źródło:
    Przegląd Geologiczny; 2010, 58, 5; 416-425
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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