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    Tytuł:
    Evaluation of the efficiency of metal recovery from printed circuit boards using gravity processes
    Autorzy:
    Franke, Dawid M.
    Suponik, Tomasz
    Nuckowski, Paweł M.
    Dubaj, Justyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1445935.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metals recovery
    printed circuit board
    gravity separation
    ICP-AES
    SEM-EDS
    Opis:
    This paper evaluates the efficiency of metal recovery from printed circuit boards (PCBs) using two gravity separation devices: a shaking table and a cyclofluid separator. The test results were compared with the results obtained from previous research, where an electrostatic separation process was used for an identically prepared feed. The feed for the separators consisted of PCBs shredded in a knife mill at cryogenic temperatures. The separation efficiency and purity of the products were evaluated based on microscopic analysis, ICP-AES, SEM-EDS, XRD, and specific density. The yield of concentrates (valuable metals) obtained from the shaking table and the cyclofluid separator amounted to 25.7% and 18.9%, respectively. However, the concentrate obtained from the cyclofluid separator was characterised by much higher purity, amounting to ~88% of valuable metals, compared to ~72% for the shaking table. In both cases, middlings formed a significant share, their yield amounting to ~25%, with the share of valuable metals of ~15%. The yield of waste obtained from the shaking table and the cyclofluid separator were 42.6% and 52.5%, respectively. In both cases, as a result of the applied process, the waste was divided into two homogeneous groups differing in grain size and shape. The recovery of metals through gravity separation is possible, in particular, by using a shaking table. These processes can also be applied to separate waste (plastics) into two groups to be selectively processed to produce new materials in line with a circular economy.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 63-77
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An evaluation of the efficiency of endpoint control on the correction of scoliotic curve with brace : A case study
    Autorzy:
    Karimi, Mohammad
    Rabczuk, Timon
    Luthfi, Mauludin
    Pourabbas, Babak
    Esrafilian, Amir
    Powiązania:
    https://bibliotekanauki.pl/articles/949744.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    skolioza
    FEM
    metoda elementów brzegowych
    scoliosis
    brace
    finite element analysis
    boundary condition
    Opis:
    The use of braces is one of the conservative treatment approaches recommended for scoliotic subjects. However, the main question posted here is how to improve the efficiency of braces to control the scoliotic curve or to decrease its progression. The aim of this study was to evaluate the efficiency of various boundary conditions (endpoint control) of brace on the correction of scoliotic curves. Method: CT scan images of a scoliotic subject, with double lumbar and thoracic curves, was used to produce 3d model of spine. The correction of spine (decrease in scoliotic curves) was determined following the use of transverse (lateral-to-medial direction) and the combination of transverse and vertical (upward-directed force, traction) forces on spine in Abaqus software. The effects of pelvic fixation (pelvic basket of a brace) on both sides (basket enclosed pelvic in both sides), on one side (basket enclosed the pelvis in only one side), and fixation of lumbar (part of the brace encircled the lumbar area) were evaluated in this study. Results: The results of this study showed that the effect of vertical forces (traction) was more than that of transverse force. Moreover, the combination of vertical and transverse forces on lumbar and thoracic curves correction was more than that of other conditions (only transverse forces). The best correction was achieved with lumbar fixation and with combination of vertical and transverse forces. Conclusions: The use the combination of vertical and transverse forces may be suggested to correct the scoliotic curve. Moreover, the efficiency of lumbar fixation in frontal plane seems to be more than pelvic fixation to correct scoliotic curve. The outputs of this study can be used to design new braces for scoliotic subjects.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 2; 3-10
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena skuteczności usuwania wybranych związków odorowych z powietrza z wykorzystaniem biofiltra ze złożem zraszanym
    EVALUATION OF THE REMOVAL EFFICIENCY OF SELECTED ODOROUS COMPOUNDS FROM AIR IN BIOTRICKLING FILTER
    Autorzy:
    Szulczyński, Bartosz
    Rybarczyk, Piotr
    Gębicki, Jacek
    Powiązania:
    https://bibliotekanauki.pl/chapters/17835699.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dezodoryzacja
    biofiltr ze złożem zraszanym
    α-pinen
    cykloheksan
    Opis:
    Ze względu na niskie koszty operacyjne oraz zdolność do całkowitego rozkładu usuwanych związków, biofiltracja jest uważana za jedną z najbardziej skutecznych metod dezodoryzacji powietrza. W pracy omówiono najczęściej stosowane metody dezodoryzacji powietrza, zwracając uwagę na zróżnicowane właściwości chemiczne różnych grup związków zapachowych. Omówiono metodę biofiltracji, wskazując obecne kierunki rozwoju tej techniki. Przedstawiono wyniki badań dotyczących jednoczesnego usuwania α-pinenu i cykloheksanu, uzyskując wartości stopnia usunięcia wymienionych związków powyżej 80%. Badania prowadzono w trójsekcyjnym biofiltrze wypełnionym ceramicznymi pierścieniami Rashiga ze złożem zraszanym cieczą wzbogaconą w związek powierzchniowo czynny.
    Low operating costs and the ability of complete degradation of removed odorous compounds, biofiltration is considered one of the most effective methods of air deodorization. The work discusses the most commonly used methods of air deodorization, with a special attention paid to the different chemical properties of various odorous compounds. Air biofiltration is discussed in this paper, indicating the current trends in the development of this technique. The results of research on the simultaneous removal of α-pinene and cyclohexane are presented. Values of the removal efficiency exceeding 80% were obtained for the abovementioned compounds. The research was carried out in a three-section biotrickling filter packed with Raschig ceramic rings. The trickling liquid was enriched with a surface active agent.
    Źródło:
    Aktualne problemy w inżynierii i ochronie atmosfery; 206-213
    9788374930208
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency evaluation of the bottom ash flotation collector by removed saturated fatty acids from soybean oil
    Autorzy:
    Kim, Minsik
    Park, Jongmyung
    Kang, Heonchan
    Jeong, Dohyun
    Powiązania:
    https://bibliotekanauki.pl/articles/2146855.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bottom ash
    flotation
    unburned carbon
    unsaturated fatty acid
    linoleic acid
    Opis:
    Unburned carbon flotation is performed to investigate the separation efficiency of the collector containing poly unsaturated fatty acid on the bottom ash. The results of an experiment using soybean oil collector (S.O. collector) show the high recovery and enrichment ratio at the dosage of 9 kg/ton. In order to investigate the collector efficiency on poly unsaturated fatty acids, a collector is manufactured using the esterification reaction. Unsaturated fatty acid oil collector (U.F.O. collector) is manufactured in which removed saturated fatty acids and increased content of poly unsaturated fatty acid from the S.O. collector. The U.F.O. collector is showed high separation efficiency at 7 kg/ton. The U.F.O. collector concentrates the unburned carbon content of the concentrate and improves the recovery with a low dosage than the S.O. collector. By removing saturated fatty acids and increasing the content of unsaturated fatty acids, this investigation provides that 1) the dosage of a collector can be reduced up to 2 kg/ton difference, and 2) the poly unsaturated fatty acids shows the best performance for adsorption properties on the unburned carbon surface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 1; 126--137
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of the needle probe test for evaluation of thermal conductivity of composite materials: two-scale analysis
    Autorzy:
    Łydżba, D.
    Różanski, A.
    Rajczakowska, M.
    Stefaniuk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/178868.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    thermal conductivity
    composite
    periodic microstructure
    homogenization
    przewodność cieplna
    kompozyt
    mikrostruktura periodyczna
    Opis:
    The needle probe test, as a thermal conductivity measurement method, has become very popular in recent years. In the present study, the efficiency of this methodology, for the case of composite materials, is investigated based on the numerical simulations. The material under study is a two-phase composite with periodic microstructure of “matrix-inclusion” type. Two-scale analysis, incorporating micromechanics approach, is performed. First, the effective thermal conductivity of the composite considered is found by the solution of the appropriate boundary value problem stated for the single unit cell. Next, numerical simulations of the needle probe test are carried out. In this case, two different locations of the measuring sensor are considered. It is shown that the “equivalent” conductivity, derived from the probe test, is strongly affected by the location of the sensor. Moreover, comparing the results obtained for different scales, one can notice that the “equivalent” conductivity cannot be interpreted as the effective one for the composites considered. Hence, a crude approximation of the effective property is proposed based on the volume fractions of constituents and the equivalent conductivities derived from different sensor locations.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 1; 55-62
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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