Recovery of Chromium from Plating Wastes

BA Bolto; M Kotowski; L Pawlowski

doi:10.1520/STP32707S

SYMPOSIA PAPER Published: 01 January 1984

STP32707S

Recovery of Chromium from Plating Wastes

Source

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.

Author Information

Bolto, BA

CSIRO Division of Chemical Technology, Victoria, Australia

Kotowski, M

Technical University of Lublin (Politechnika Lubelska), Lublin, Poland

Pawlowski, L

Technical University of Lublin (Politechnika Lubelska), Lublin, Poland

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Details

Developed by Committee: D34

Pages: 278–288

DOI: 10.1520/STP32707S

ISBN-EB: 978-0-8031-4916-8

ISBN-13: 978-0-8031-0405-1

Recovery of Chromium from Plating Wastes

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