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Wyszukujesz frazę "mica" wg kryterium: Temat


Tytuł:
Understanding the collection behavior of gangue minerals in fine flake graphite flotation
Autorzy:
Xu, Wenlu
Sun, Kangkang
Qiu, Yangshuai
Zhang, Lingyan
Yang, Luo
Wei, Shaowei
Ding, Dafa
Tematy:
flake graphite
mica
quartz
flotation
entrainment
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/2146848.pdf  Link otwiera się w nowym oknie
Opis:
Flotation is one of the most common and effective methods for the beneficiation of natural graphite resources. However, the upgrading efficiency of flotation is always finite due to the undesirable collection of gangue minerals. In this work, the collecting mechanism of three typical gangue minerals, including mica, quartz, and feldspar, in fine flake graphite flotation was investigated. Results of batch flotation tests for single-minerals and artificial mixtures confirmed the enhanced collection of gangues in the presence of graphite particles. Contact angle and zeta potential results and theoretical calculations of the interaction between graphite and gangue particles based on typical DLVO theory indicated that it is impossible to collect gangue minerals by true flotation or through heterocoagulation with graphite particles. The fitting results of accumulated gangue recoveries and accumulated water recoveries using the Warren method demonstrated that most gangue minerals entered the concentrate through entrainment, with a small proportion by bubble inclusions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pre-concentration of vanadium-bearing mica from stone coal by roasting-flotation
Autorzy:
Tang, J.
Zhang, Y.
Bao, S.
Liu, C.
Tematy:
roasting
flotation
vanadium bearing mica
stone coal
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/109373.pdf  Link otwiera się w nowym oknie
Opis:
In China, stone coal is an important source of vanadium. The use of roasting–floatation for the pre-concentration of vanadium bearing mica from vanadium bearing stone coal was investigated based on its mineralogical characteristics. The results showed that the vanadium occurred in mica minerals and the main gangue minerals were coal, calcite, and quartz. The pre-concentration process comprises three key steps: roasting, desliming, and flotation. The coal was completely removed by roasting at 700 °C for an hour. Slime was concentrated and the subsequent flotation pulp was improved by desliming. Calcite was removed by reverse flotation and mica was concentrated by positive floatation. During the process, the grade of V2O5 was increased from 0.71% to 1.14%, and 46.18% of the tailings were rejected. The leaching rate of vanadium was increased from 30.49% of raw ore to 69.15% of the concentrate which was an increase of about 40% at the same leaching process. This technique may promote the efficient utilization of stone coal resources.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of calcite and mica contents in nepheline syenite samples on the ceramic body sintering behaviours and surface roughness
Autorzy:
Durgut, Emrah
Cinar, Mustafa
Ozdemir, Orhan
Tematy:
nepheline syenite
calcite
mica
ceramic
sintering
surface roughness
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/2146930.pdf  Link otwiera się w nowym oknie
Opis:
In this study, the effects of calcite and mica contents in nepheline syenite (NS) samples beneficiated by high intensity dry magnetic separation and flotation methods on ceramic bodies were investigated in detail. The NS samples were, first, sintered to observe the physical and surface roughness properties, and characterized based on the change of NS samples such as color, shrinkage, water absorption, and surface roughness after the sintering process. L-a-b color and Ra, Rz, Rt values for the NS samples were determined. The decrease in calcite and mica contents affected the surface of sintered specimens positively by reducing roughness values. Additionally, the water absorption values were found to be directly proportional to Ra values for unglazed surfaces. In conclusion, calcite and mica minerals in NS samples negatively affected surface quality by forming pinholes due to dehydroxylation and outgassing reactions in the sintering process.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gamma-Irradiations Effects on Structural and Micro-Structural Parameters of Chromium(III) – Silicate Base Mica Clay
Autorzy:
Elsabawy, Khaled M.
Abou-Sekkinaa, Morsy M.
Tematy:
Free fluoride
Mica clay
SEM
Structural Parameters
Synthesis
XRD
Pokaż więcej
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1186742.pdf  Link otwiera się w nowym oknie
Opis:
Solution route was applied to synthesize new family of free-fluoride synthetic clay. All starting solutions were made by applying carbon tetra-chloride (CCl4) as a solvent. The selected sample of synthetic free fluoride – Na-4-mica was having the general formula (Na4Mg6M4Si4O22•nH2O) where M = Cr3+ was exposured to two different ɤ-irradiation doses 1st dose = 1.5 MR/h and 2nd dose = 3 MR/h at 25 cm distance. Structural parameters such as lattice constants, volume and phase quality were monitoring carefully by using both of XRD and SEM evaluating grain size of the mica bulk. Structural investigations proved that Cr-clay exhibits monoclinic phase accompanied with structure quality in comparison with both of Bi-and Al-clays
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the Regulation of Crypto Exchanges in Lithuania and Estonia
Autorzy:
Bočánek, Marek
Tematy:
MiCA
crypto-assets
crypto exchange
crypto wallet
AML
payments
Pokaż więcej
Wydawca:
Uniwersytet Gdański. Centrum Prawa Samorządowego i Prawa Finansów Lokalnych
Powiązania:
https://bibliotekanauki.pl/articles/56836704.pdf  Link otwiera się w nowym oknie
Opis:
This article consults new regulations in Estonia and Lithuania where significant amendments have been adopted for the establishment and approval of crypto exchange services' providers. While Estonia has adopted an important amendment to the regulation of providers of crypto exchange services and of crypto wallet services, Lithuania has adopted a completely new regulation that has never been part of its legal system in any aspect. Despite these amendments, it's expectable that these regulations will have only temporary effect by the adoption of Markets in Crypto Assets Regulation (MiCA), now only at the stage of working paper.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depression effect of corn starch on muscovite mica at different pH values
Autorzy:
Peng, W.
Zhang, L.
Qiu, Y.
Song, S.
Tematy:
muscovite mica
corn starch
pulp pH
depression effect
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/110573.pdf  Link otwiera się w nowym oknie
Opis:
The depression effect of corn starch on the surface of muscovite mica powder at different pulp pH value was investigated. The experiments were performed on single mineral, and its flotation performance was studied by flotation tests, adsorption quantity measurement, zeta-potential technique and Fourier transform infrared (FT-IR). The results indicated that the depression effect was varied with the pulp pH value when dodecylamine chloride (DDA) was used as collector, the strongest inhibitory effect appeared at pH 2 and the zeta-potential of muscovite mica increased overall after conditioned with corn starch solution. It was confirmed by the FT-IR spectra that the corn starch indeed adsorbed on the surface of muscovite mica powder and physical adsorption was occurred between muscovite mica and corn starch. This study leads to a better understanding of the depression effect of corn starch on the surface of muscovite mica powder.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetyka adsorpcji surowiczej albuminy z krwi wołu (BSA) na powierzchniach modelowych z zastosowaniem mikrowagi kwarcowej (QCM)
Adsorption of bovine serum albumin (BSA) on the model surface using the quartz crystal microbalance (QCM)
Autorzy:
Łapczyńska, Marta
Opis:
Materiały biomedyczne powinny cechować się wysoką biokompatybilnością, którą determinują oddziaływania pomiędzy molekułami białka i powierzchnią biomateriału. W niniejszej pracy badano wpływ zmian konformacji surowiczej albuminy z krwi wołu (BSA) na mechanizm procesu adsorpcji na powierzchniach modelowych (krzem, mika, złoto), a także określano wpływ sił determinujących proces adsorpcji białka. Kinetykę adsorpcji BSA, jego całkowitą ilość zaadsorbowanej masy oraz strukturę tworzonych filmów białkowych badano przy użyciu mikrowagi kwarcowej z monitorowaną dyssypacją (QCM-D). Wykonanie pomiarów kąta zwilżania pozwoliło na jakościową analizę modelowych powierzchni miki i krzemu modyfikowanych BSA metodą adsorpcji z roztworu. Z kolei obrazowanie techniką mikroskopii sił atomowych (AFM) posłużyło do określenia topografii filmów białkowych tworzonych na modelowej powierzchni krzemu. Badania ukazały związek pomiędzy formą konformacyjną a masą BSA zaadsorbowaną na modelowej powierzchni SiO2 techniką QCM-D, gdzie zmiana z naturalnej formy N na wydłużoną formę E białka spowodowała obniżenie masy zaadsorbowanej warstwy. Ponadto obrazowanie AFM potwierdziło obecność rozwiniętej oraz naturalnej formy białka w warunkach pH odpowiednio 3.0 i 5.0. Wyniki pomiarów kąta zwilżania wskazują, iż asymetryczny rozkład powierzchniowego ładunku BSA determinuje jego adsorpcję do ujemnie naładowanych powierzchni SiO2 oraz miki w badanych pH. Maksymalną wartość kąta zwilżania uzyskano w warunkach pH=5.0, któremu odpowiada maksymalna wartość masy BSA uzyskana techniką QCM-D.
Biomedical materials should be characterized by a high biocompatibility, which determines the interaction between protein molecules and the surface of the biomaterial. This study investigates the impact of changes in the conformation of the bovine serum albumin (BSA) on the mechanism of adsorption on model surfaces (silica, mica, gold), and also determined the impact of forces that determine protein adsorption process.The kinetics adsorption of BSA, the total amount of adsorbed mass and structure of the protein film formed was measured using the quartz crystal microbalance with dissipation monitoring (QCM-D). The contact angle measurements allowed for a qualitative analysis of the model surface of mica and silicon modified BSA by adsorption from solution. The imaging by atomic force microscopy technique allowed to determine the topography of the protein film formed on the silicon surface model. The study showed the relationship between conformational form of BSA and its mass adsorbed on the SiO2 surface by QCM-D technique, where the change from the natural N form in the extended E form of protein reduced the mass of adsorbed layers. In addition, AFM imaging confirmed the presence of the extended and natural form of the protein under conditions of pH 3.0 and 5.0 respectively. The results of contact angle measurements show that the asymmetric distribution of surface charge determines the BSA adsorption to the negatively charged surface of SiO2 and mica in the studied pH. The maximum value of contact angle were obtained under conditions of pH=5.0, which corresponds to the maximum value of the mass of BSA obtained by QCM-D technique.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne

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