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- W2327304801 abstract "Abstract Chelating agents, such as ethylenediaminetetraacetic acid (EDTA) and its thermal decomposition products [iminodiacetic acid (IDA), N(2-hydroxyethyl)iminodiacetic acid (HIDA)], and oxalic acid, enhance the dissolution of magnetite and hermatite at temperatures above 90°C. The mechanism involves three different processes: (a) acid dissolution assisted by the chelating agent, (b) reductive dissolution brought about by internal electron transfer between the ligand and the constituent Fe(III) ion complexes, followed by the released of Fe(II), and (c) additional autocatalytic dissolution by the ferrous-carboxylate complexes generated in solution by process (b). Hydrogen peroxide quenches pathway (c) by oxidizing dissolved Fe(II). The rates dissolution in the absence and in the presence of high H 2 O 2 concentrations allow for the evaluation of the relative importance of (a) and (b). Hydrazine greatly accelarated the overall dissolution rates through direct heterogeneous redox interaction with the surface Fe(III) ions. In all cases magnetic is more reactive than hematite. Rate constants are calculated for the various dissolution pathways and, in the case of heterogeneous electron transfer, the values are compared with those for analogous homogeneous reactions." @default.
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- W2327304801 date "1990-02-01" @default.
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- W2327304801 title "Interactions of metal hydrous oxides with chelating agents" @default.
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- W2327304801 doi "https://doi.org/10.1016/0021-9797(90)90157-j" @default.
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