STP851: Recovery of Chromium from Plating Wastes

    Bolto, BA
    Group leader, CSIRO Division of Chemical Technology, ClaytonVictoria,

    Kotowski, M
    Assistant and department head, Technical University of Lublin (Politechnika Lubelska), Lublin,

    Pawlowski, L
    Assistant and department head, Technical University of Lublin (Politechnika Lubelska), Lublin,

    Pages: 11    Published: Jan 1984


    Abstract

    Recovery of chromium from a plating sludge is discussed. The process consists of two parts: roasting the sludge with sodium carbonate (Na2CO3) and calcium oxide (CaO), followed by leaching. The optimal parameters for roasting are a temperature range of 950 to 1000°C and Na2CO3 and CaO contents of 2.4 and 2.8 mol per mole of chromium oxide (Cr2O3) respectively.

    Demineralized water is recommended for the leaching of sodium chromate (Na2CrO4) from the agglomerate formed during roasting. The leached water is recycled through a strongly acidic cation exchanger followed by a weakly basic anion exchanger. A solution of chromate or chromic acid having a concentration up to 60 kg Cr/m3 is obtained.

    Keywords:

    chromium, recovery, recycling, plating, sludge, ion exchange, leaching, solid wastes, hazardous solid wastes


    Paper ID: STP32707S

    Committee/Subcommittee: D34.03

    DOI: 10.1520/STP32707S


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