A study on the treatment of wastes in hot dip galvanizing plants

S. Sönmez; S. Aktaş; E. Açma

doi:10.1179/cmq.2003.42.3.289

A study on the treatment of wastes in hot dip galvanizing plants

S. Sönmez^*, S. Aktaş, E. Açma

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

In this study, a new method to treat the waste pickling liquor and zinc stripping solutions originating from hot-dip galvanizing process was developed. For waste pickling liquor, iron was oxidized to Fe³⁺ by the addition of H₂O₂. After the oxidation, iron was precipitated as goethite by NaOH neutralization. Yellow coloured β-goethite was converted to α-Fe₂O₃ by dehydration at 250 °C. Iron powder was produced by the reduction of goethite with hydrogen at 1000 °C. Zinc was completely precipitated by the addition of Na₂CO₃. Precipitated product was ZnCO₃ and ZnO was produced by the calcination of this product at 300 °C. For de-galvanizing solution, zinc was completely stripped from the galvanized scraps constructing an electrochemical cell with copper electrode in H₂SO₄. Almost pure ZnSO₄.H₂O was obtained by the addition of ethyl alcohol from the iron free zinc stripping solution. Ethyl alcohol was recovered by the distillation process.

Original language	English
Pages (from-to)	289-300
Number of pages	12
Journal	Canadian Metallurgical Quarterly
Volume	42
Issue number	3
DOIs	https://doi.org/10.1179/cmq.2003.42.3.289
Publication status	Published - Jul 2003

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10.1179/cmq.2003.42.3.289

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abstract = "In this study, a new method to treat the waste pickling liquor and zinc stripping solutions originating from hot-dip galvanizing process was developed. For waste pickling liquor, iron was oxidized to Fe3+ by the addition of H2O2. After the oxidation, iron was precipitated as goethite by NaOH neutralization. Yellow coloured β-goethite was converted to α-Fe2O3 by dehydration at 250 °C. Iron powder was produced by the reduction of goethite with hydrogen at 1000 °C. Zinc was completely precipitated by the addition of Na2CO3. Precipitated product was ZnCO3 and ZnO was produced by the calcination of this product at 300 °C. For de-galvanizing solution, zinc was completely stripped from the galvanized scraps constructing an electrochemical cell with copper electrode in H2SO4. Almost pure ZnSO4.H2O was obtained by the addition of ethyl alcohol from the iron free zinc stripping solution. Ethyl alcohol was recovered by the distillation process.",

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AU - Açma, E.

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AB - In this study, a new method to treat the waste pickling liquor and zinc stripping solutions originating from hot-dip galvanizing process was developed. For waste pickling liquor, iron was oxidized to Fe3+ by the addition of H2O2. After the oxidation, iron was precipitated as goethite by NaOH neutralization. Yellow coloured β-goethite was converted to α-Fe2O3 by dehydration at 250 °C. Iron powder was produced by the reduction of goethite with hydrogen at 1000 °C. Zinc was completely precipitated by the addition of Na2CO3. Precipitated product was ZnCO3 and ZnO was produced by the calcination of this product at 300 °C. For de-galvanizing solution, zinc was completely stripped from the galvanized scraps constructing an electrochemical cell with copper electrode in H2SO4. Almost pure ZnSO4.H2O was obtained by the addition of ethyl alcohol from the iron free zinc stripping solution. Ethyl alcohol was recovered by the distillation process.

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A study on the treatment of wastes in hot dip galvanizing plants

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