高温水中での水酸化鉄粒子からのニッケルフェライト生成速度

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  • Formation rates of nickel ferrite from iron(III) hydroxides in high-temperature water.
  • コウオンスイチュウ デ ノ スイサンカ テツ リュウシ カラ ノ ニッケル フ

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The formation rates of NiFe2O4 which is the major product of reaction between nickel ion and corrosion products contained in the cooling water of boiling water reactors were studied according to a presented reaction model. Two kinds of amorphousiron (III) hydroxides and γ-FeOOH were used as simulated particles of corrosion products in the experiments. The amount of NiFe2O4 generated was measured in situ by a modified magnetic balance, utilizing its magnetic property. The presented model shows that diffusion of nickel ion into particles and dehydration of iron (M) hydroxide should occur simultaneously to form NiFe2O4. A mathematical formula of NiFe2O4conversion can be expressed as the product of the fraction permeated by nickel and the dehydration conversion calculated by Avrami's equation. The fraction permeated by nickel is calculated by a diffusion equation, assuming spherical particles. Based on the relationship of the diffusion coefficient of nickel ion to temperature, the apparent activation energy of γ-FeOOH is 1.24 × 105 J/mol, which is the highest of the three iron (III) hydroxides. The calculated values of NiFe2O3conversion by the presented model are in accord with variations of experimental values with time, and the model can estimate the final NiFe2O3 conversion within ± 10 % error.

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