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    Wyświetlanie 1-4 z 4
    Tytuł:
    Extraction of metals from electronic waste by bacterial leaching
    Autorzy:
    Willner, J.
    Fornalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/208166.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metal recovery
    bioleaching
    electronic scrap
    electronic waste
    Acidithiobacillus ferrooxidans
    bacterial leaching
    biohydrometallurgy
    recovering metals
    odzysk metali
    bioługowanie
    ługowanie bakteryjne
    biohydrometalurgia
    odzyskiwanie metali
    złom elektroniczny
    odpady elektroniczne
    Opis:
    Electronic waste is usually processed by means of classical methods, i.e. in pyro- and hydro-metallurgical processes. However, new solutions for more economically and ecologically efficient recovery of metals are constantly being searched for. Biohydrometallurgy can become a promising technology of recovering metals from industrial waste. Bioleaching - one of the methods applied in that technology - is the subject of particular interest of many scientific centres. The paper presents the results of laboratory tests of bacterial leaching of metals from electronic scrap. It describes the mechanisms of this process and the factors influencing the chemical reaction. The paper also presents preliminary results of experimental studies on the copper bioleaching from electronic waste with the participation of Acidithiobacillus ferrooxidans bacteria.
    Źródło:
    Environment Protection Engineering; 2013, 39, 1; 197-208
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioleaching of indium and tin from used LCD panels
    Autorzy:
    Willner, J.
    Fornalczyk, A.
    Gajda, B.
    Saternus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110195.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bioleaching
    ITO
    indium recovery
    tin recovery
    LCD panels
    Opis:
    The demand for indium is increasing every year. This metal is mainly used as indium tin oxide (ITO) in the production of transparent conductive coatings for liquid crystal displays (LCD). This paper focuses on biohydrometallurgical methods used for the recovery of indium and tin from LCD sourced from spent mobile phones. Bioleaching experiments were carried out in two different leaching media: 9K medium and H2SO4 solution, using mixed, adapted bacteria Acidothiobacillus ferrooxidans and Acidothiobacillus thiooxidans. The main aim of this study was to evaluate the potential and efficiency of indium and tin extraction in the presence of acidophilic microorganisms. Within 35 days, using 9K medium, 55.6% of indium was bioleached, whereas the chemical leaching resulted in a value of 3.4%. Leaching efficiency of tin was 90.2% on the 14th day of the experiment for the biological system (9K) and 93.4% on 21st day of control leaching.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 639-645
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Closing the Loop: Key Role of Iron in Metal-Bearing Waste Recycling
    Autorzy:
    Sedlakova-Kadukova, J.
    Marcincakova, R.
    Mrazikova, A.
    Willner, J.
    Fornalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351340.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bioleaching
    e-waste
    acidophilic bacteria
    iron
    Opis:
    The role of iron in metal-bearing waste bioleaching was studied. Four various types of waste (printed circuit boards (PCBs), Ni-Cd batteries, alkaline batteries and Li-ion batteries) were treated by bioleaching using the acidophilic bacteria A. ferrooxidans and A. thiooxidans (separately or in mixture). Role of main leaching agents (Fe3+ ions or sulphuric acid) was simulated in abiotic experiments. Results showed that oxidation abilities of Fe3+ ions were crucial for recovery of Cu and Zn from PCBs, with the efficiencies of 88% and 100%, respectively. To recover 68% of Ni from PCBs, and 55% and 100% of Ni and Cd, respectively, from Ni-Cd batteries both oxidation action and hydrolysis of Fe3+ were required. The importance of Fe2+ ions as a reducing agent was showed in bioleaching of Co from Li-ion batteries and Mn from alkaline batteries. The efficiency of the processes has increased by 70% and 40% in Co and Mn bioleaching, respectively, in the presence of Fe2+ ions. Based on the results we suggest the integrated biometallurgical model of metal-bearing waste recycling in the effort to develop zero-waste and less energy-dependent technologies.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1459-1466
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Specific Conditions on Cu, Ni, Zn and Al Recovery from PCBS Waste Using Acidophilic Bacterial Strains
    Autorzy:
    Mrážiková, A.
    Kaduková, J.
    Marcinčáková, R.
    Velgosová, O.
    Willner, J.
    Fornalczyk, A.
    Saternus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353402.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bioleaching
    metals
    electronic waste
    PCBs
    Opis:
    The objective of this work was to evaluate the influence of static, stirring and shaking conditions on copper, zinc, nickel and aluminium dissolution from printed circuit boards (PCBs) using the mixed acidophilic bacterial culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. The results revealed that static conditions were the most effective in zinc and aluminium dissolution. Zinc was removed almost completely under static conditions, whereas maximum of nickel dissolution was reached under the stirring conditions. The highest copper recovery (36%) was reached under stirring conditions. The shaking conditions appeared to be the least suitable. The relative importance of these systems for the bioleaching of copper and nickel decreased in the order: stirring, static conditions, shaking.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 261-264
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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