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  • A novel process for the neutralization of NaOH at an aluminium semimanufactures production facility = Nov nevtralizacijski postopek NaOH pri proizvodnji aluminijevih polizdelkov
    Renko, Mija
    During the production of aluminium semifactures on presses there are some tools that must be cleaned because they are covered with aluminium. The tools are soaked in a 20% solution of sodium ... hydroxide (NaOH) in which the aluminium is dissolved. The tools are then washed with water, which causes a problem because it contains 30-50 mg Al per 1000 ml. There is also a problem with the waste hydroxide, which contains 200 g of NaOH per 1000 ml and 120 g Al per 1000 ml. To avoid environmental polution and the high costs of NaOH regeneration a new way of hydroxide neutralization has been found. The proces is based on the neutralization of NaOH with carbon dioxide (CO$_2$) in the reaction vessel. During this reaction NaHCO$_3$ is formed and the Al is adsorbed onto an added adsorbent. At the bottom of reaction vessel this mix is filtered. The filtered water is clean and can be allowed to flow into the sewage system. The residue is dried and because it is no longer toxic it can be used. Before starting the process of neutralization in production some laboratory tests had to be made first. The chemical composition and the concentrations of input and output substances were determined as well as chemical reactions during the process of neutralization. Determination of the concentrations of input and output substances was made by inductively coupled plasma atomic absorption spectrometry (ICP-AES).
    Vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 35, št. 5, sep.-okt. 2001, str. 265-269)
    Vrsta gradiva - članek, sestavni del
    Leto - 2001
    Jezik - angleški
    COBISS.SI-ID - 306527

    Povezava(-e):

    Digitalna knjižnica Slovenije - dLib.si

vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 35, št. 5, sep.-okt. 2001, str. 265-269)

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