Dissolution Behavior of Magnetite in Different pH Solutions Containing EDTA

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  • EDTA溶液におけるマグネタイトの溶解挙動
  • EDTA ヨウエキ ニ オケル マグネタイト ノ ヨウカイ キョドウ

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Description

Magnetite particles were dissolved at 60-95°C for 9h in different pH (0.1-11) solutions containing EDTA (0-3×10-2mol·dm-3). In the absence of EDTA the dissolution proceeds only at pH below 2. When EDTA is present the dissolution proceeds up to pH 6, and in the pH region of 2-5, the dissolved Fe concentration is almost independent of pH. The dissolution involves a number of processes such as (1) transfer of Fe2+ and Fe3+ ions from magnetite to the solution, (2) chelation of the dissolved Fe2+ and Fe3+ ions with EDTA to form FeIIY and FeIIIY, and (3) air oxidation of Fe2+ and FeIIY ions to produce Fe3+ and FeIIIY. The concentration of dissolved Fe ions can be calculated as the sum of the equilibrium concentrations of the species, i. e., Fe+2, Fe3+, FeIIY and FeIIIY. The actual dissolution behavior was in good agreement with the results calculated as a function of pH and the concentration of EDTA added.

Journal

  • CORROSION ENGINEERING

    CORROSION ENGINEERING 34 (4), 222-227, 1985

    Japan Society of Corrosion Engineering

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