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    Wyświetlanie 1-6 z 6
    Tytuł:
    Study on condition prediction and influencing factors of manganese carbonate recovery by high gradient pulse magnetic separation
    Autorzy:
    Wang, Zhenggang
    Nie, Guanghua
    Tang, Yun
    Piao, Haishan
    Chen, Jian
    Powiązania:
    https://bibliotekanauki.pl/articles/24085829.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mineral particles
    impulse
    volume susceptibility
    magnetic field strength
    DLVO theory
    Opis:
    Manganese carbonate ore belongs to weakly magnetic minerals, and its co-associated minerals are mainly non-magnetic minerals, which can be separated from gangue minerals at high magnetic field intensity. However, manganese grade and recovery of magnetic separation concentrate of manganese carbonate ore are low in actual production. Therefore, the influences of manganese carbonate particle size, magnetic field intensity, volume susceptibility, pulse stroke, pH, and other factors were studied. The optimal test conditions for manganese carbonate ore recovery by high-gradient magnetic separation were predicted through the calculation results. The results show that the particle radius of manganese carbonate is 0.020 mm, the pulse impulse time is 200 r/min, and the magnetic field intensity is 0.9 T. The optimum condition test was carried out with Qianbei manganese carbonate ore as the material. The test results show that the optimum conditions are the particle radius of 0.074-0.019 mm, pulse impulse time of 200 r/min, and magnetic field intensity of 1.2 T. The reason for the deviation is that the actual ore has a fine distribution particle size, many associative bodies, complex composition, and serious agglomeration, resulting in variable particle volume susceptibility. The capture yield increases with the increase of magnetic field intensity and volume susceptibility but decreases with the increase of pulse. The lower the surface potential of manganese carbonate, the higher the recovery of manganese carbonate. The grade of manganese concentrate was 19.06% and the recovery was 76.85%. Mixed manganese concentrate with a grade of 18.04% and recovery of 87.14% was obtained by adding drugs and changing the grinding method.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168668
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructures and Mechanical Properties of ODS Ferritic Stainless Steels for High Temperature Service Applications
    Autorzy:
    Noh, Sanghoon
    Kang, Suk Hoon
    Kim, Tae Kyu
    Powiązania:
    https://bibliotekanauki.pl/articles/355864.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stainless steel
    oxide dispersion strengthening
    oxide particles
    tensile strength
    Opis:
    In this study, ODS ferritic stainless steels were fabricated using a commercial alloy powder, and their microstructures and mechanical properties were studied to develop the advanced structural materials for high temperature service applications. Mechanical alloying and uniaxial hot pressing processes were employed to produce the ODS ferritic stainless steels. It was revealed that oxide particles in the ODS stainless steels were composed of Y-Si-O, Y-Ti-Si-O, and Y-Hf-Si-O complex oxides were observed depending on minor alloying elements, Ti and Hf. The ODS ferritic stainless steel with a Hf addition presented ultra-fine grains with uniform distributions of fine complex oxide particles which located in grains and on the grain boundaries. These favorable microstructures led to superior tensile properties than commercial stainless steel and ODS ferritic steel with Ti addition at elevated temperature.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 921-924
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetyka mielenia kwarcytu przy kaskadowym ruchu złoża nadawy
    Grinding kinetics of selected raw materials considering the bulk movement
    Autorzy:
    Olejnik, T. P.
    Gluba, T.
    Obraniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2070658.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    młyn kulowy
    kinetyka rozdrabniania
    wytrzymałość ziaren
    ball mill
    grinding kinetics
    particles strength
    Opis:
    W pracy zbadano ruch złoża kwarcytu. Okreśłono zmianę składu granułometrycznego materiału w trakcie przemiału i na tej podstawie obliczono szybkości rozdrabniania poszczegółnych frakcji wymiarowych ziarna. Zbadano siły oraz naprężenia niszczące dła wybranych kłas rozmiarowych ziarna.
    The bulk movement of quartzite in a ball mill was investigated. The change of mean particle size during grinding was described. The specific grinding ratę of setected partictes' size fractions was determined. The load and destructive stresses corresponding to partictes size fraction were defined.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2009, 4; 100-101
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compressive Strength of EN AC-44200 Based Composite Materials Strengthened with alpha-Al2O3 Particles
    Autorzy:
    Kurzawa, A.
    Kaczmar, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/381782.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    compressive strength
    composite materials
    aluminium oxide particles
    wytrzymałość na ściskanie
    materiały kompozytowe
    tlenek glinu
    Opis:
    The paper presents results of compressive strength investigations of EN AC-44200 based aluminum alloy composite materials reinforced with aluminum oxide particles at ambient and at temperatures of 100, 200 and 250oC. They were manufactured by squeeze casting of the porous preforms made of α-Al2O3 particles with liquid aluminium alloy EN AC-44200. The composite materials were reinforced with preforms characterized by the porosities of 90, 80, 70 and 60 vol. %, thus the alumina content in the composite materials was 10, 20, 30 and 40 vol.%. The results of the compressive strength of manufactured materials were presented and basing on the microscopic observations the effect of the volume content of strengthening alumina particles on the cracking mechanisms during compression at indicated temperatures were shown and discussed. The highest compressive strength of 470 MPa at ambient temperature showed composite materials strengthened with 40 vol.% of α-Al2O3 particles.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bending Strength of EN AC-44200 – Al2O3 Composites at Elevated Temperatures
    Autorzy:
    Kurzawa, A.
    Kaczmar, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/382237.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wytrzymałość
    stop aluminium
    materiały kompozytowe
    tlenek glinu
    bending strength
    aluminium alloy
    composite materials
    aluminium oxide particles
    Opis:
    The paper presents results of bend tests at elevated temperatures of aluminium alloy EN AC-44200 (AlSi12) based composite materials reinforced with aluminium oxide particles. The examined materials were manufactured by squeeze casting. Preforms made of Al2O3 particles, with volumetric fraction 10, 20, 30 and 40 vol.% of particles joined with sodium silicate bridges were used as reinforcement. The preforms were characterised by open porosity ensuring proper infiltration with the EN AC-44200 (AlSi12) liquid alloy. The largest bending strength was found for the materials containing 40 vol.% of reinforcing ceramic particles, tested at ambient temperature. At increased test temperature, bending strength Rg of composites decreased in average by 30 to 50 MPa per 100°C of temperature increase. Temperature increase did not significantly affect cracking of the materials. Cracks propagated mainly along the interfaces particle/matrix, with no effect of the particles falling-out from fracture surfaces. Direction of cracking can be affected by a small number of agglomerations of particles or of non-reacted binder. In the composites, the particles strongly restrict plastic deformation of the alloy, which leads to creation of brittle fractures. At elevated temperatures, however mainly at 200 and 300°C, larger numbers of broken, fragmented particles was observed in the vicinity of cracks. Fragmentation of particles occurred mainly at tensioned side of the bended specimens, in the materials with smaller fraction of Al2O3 reinforcement, i.e. 10 and 20 vol.%.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 103-108
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bending Strength of Composite Materials with EN AC-44200 Matrix Reinforced with Al2O3 Particles
    Autorzy:
    Kurzawa, J.
    Kaczmar, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/381132.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite materials
    aluminium oxide particles
    bending strength
    materiały kompozytowe
    tlenek glinu
    wytrzymałość na zginanie
    Opis:
    There are presented results of a research on bending strength of aluminum alloy EN AC-44200 based composite materials reinforced with aluminum oxide particles. The composite materials were manufactured by squeeze casting with the liquid EN AC-44200 Al alloy of porous ceramic preforms under pressure of 100 MPa. For reinforcing of the EN AC-44200 matrix alloy, preforms made of Al2O3 particles with porosity 60, 70, 80 and 90% were applied. In relation to unreinforced EN AC-44200 base Al alloy, bending strength of composite materials increased about 10% per each 10 vol.% increase of Al2O3 particles in the matrix. The highest bending strength of over 400 MPa was reached by the materials reinforced with 30 and 40 vol.% of Al2O3 particles. Microscopic observations of fracture surfaces confirm that the particles intensively restrict plastic deformation of the alloy, which contributes to creation of a typically brittle fracture. The particles present on the crack propagation path inhibit development of microcracks initiated during bend tests. Most often, the fracture runs through interfacial matrix-particle boundaries, which is caused by brittle bridges of silica binder, present on these boundaries.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 61-64
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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