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Wyszukujesz frazę "El-Sayed, M.E.A." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Phenolic compounds and antioxidant activity of rice straw extract
    Autorzy:
    Elzaawely, A.A.
    Maswada, H.F.
    El-Sayed, M.E.A.
    Ahmed, M.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/10781.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Źródło:
    International Letters of Natural Sciences; 2017, 64
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mineralogical study and enhanced gravity separation of gold-bearing mineral, South Eastern Desert, Egypt
    Autorzy:
    El-Sayed, Samah
    Abdel-Khalek, N. A.
    El-Shatoury, E. H.
    Abdel-Motelib, A.
    Hassan, M. S.
    Abdel-Khalek, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1845207.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    gold
    mineralogy
    petrography
    gravity separation
    Falcon concentrator
    Opis:
    El-Hudi gold deposit, located in the South Eastern Desert of Egypt, represent large vein- type gold occurrence. The representative sample revealed the abundance of quartz as main constituent with minor amounts of mineral impurities. Gold was detectable (12 g/t) as determined using atomic absorption. The petrographic study revealed that the gold grains ranged from 10-40 μm. The grain boundaries of quartz are highly stained with iron minerals as hematite and limonite. Sericite mineral is common in discrete gold-bearing veins. Eroded pyrite was detected with high alteration leaving only cubic-shaped cavities behind. Different techniques for gravity separation were used to separate gold from the quartz mineral. After crushing and grinding of the sample, shaking table was used to upgrade the coarser fractions while Falcon concentrator was employed to upgrade the fine fraction. The best concentrate was obtained through grinding the whole sample to less than 0.2 mm, followed by cleaning steps. The gold content is increased from 12 to 145 g/t with total recovery of 78%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 5; 839-848
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of polymers on the grinding and rheology of ultrafine Egyptian calcium carbonate suspension
    Autorzy:
    Mourad, Sabreen H
    Khalil, Mostafa M. H.
    Abdel-Khalek, N. A.
    Abdel-Khalek, M. A.
    Selim, K. A.
    Hassan, El-Sayed R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175428.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fillers
    calcium carbonate
    ultra-fine grinding
    surface modifications
    Mechano-chemical
    activation
    polymers
    Opis:
    The investigation of surface modification of Egyptian calcium carbonate via polymers was achieved with simultaneous ultra-fine grinding. Attrition mill and planetary mill were used for wet and dry grinding, respectively. The parameters affecting the grinding were studied such as ball number, speed and grinding time. The rheological characteristics of the aqueous calcium carbonate suspensions were studied in the presence of different types of polymers. The results indicated that the mechanical force could clearly affect the modification characteristics of calcium carbonate due to its mechanochemical effects. The viscosity of calcium carbonate suspension depends on the volume percentage or weight percentage. The dispersing agent increases the solid concentration for a given particle fineness.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152163
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing the removal of iron oxide from Egyptian feldspar ore
    Autorzy:
    Yassin, E. Khaled
    Elbendari, A.M.
    Hassan, El-Sayed R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/27323643.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    feldspar ore
    iron oxide contamination
    ball mill
    Carpco magnetic separator
    acid leaching
    whiteness
    Opis:
    The demand for feldspar as a raw material for various industrial applications continuously increases. Feldspar is a primary raw material in manufacturing ceramics, glass, fillers, welding electrodes, and enamel. Feldspar is often associated with iron oxide, which decreases its economic value and hinders its industrial application. The present work aimed at reducing iron oxide content in Egyptian feldspar ore from the Wadi Zerabi locality. Ball milling was used for preparing feldspar feed of size -250+45μm. Carpco dry high-intensity magnetic separation followed by acid leaching processes were carried out in order to decrease the iron contamination and increase the feldspar content. A Box-Behnken statistical design was used to optimize the magnetic separation results. From a feldspar feed containing 1.40% Fe2O3, a non-magnetic concentrate of 0.25% Fe2O3 was obtained. The Fe2O3 removal reached up to 82% with a high yield as the % weight of non-magnetic feldspar reached up to 97.5%. The leaching process further reduced the iron oxide content down to 0.19 %. Also, the feldspar whiteness was improved from 65.17% in the original ore to 85.60% in the leached product.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176420
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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