Process of magnetite dissolution in orthophosphoric and sulfuric acid solutions according to kinetic and electrochemical methods

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Аннотация

The kinetics of dissolution and the electrochemical features of the behavior of magnetite (at cathodic polarization) in solutions of sulfuric and orthophosphoric acids have been studied. Two independent experimental methods established that the rate and current of dissolution in H3PO4 are higher than in H2SO4. This pattern is explained on the basis of the stronger complexing properties of various kinds of phosphate anions in comparison with sulfate anions in solution with iron(III) ions. In the range of studied concentrations of orthophosphoric and sulfuric acids, Fe(II) and Fe(III) ions, the orders of magnitude for orthophosphoric and sulfuric acids are 1.3 ± 0.1; for iron(II) ions – 0.25 ± 0.1, for iron(III) ions – -0.25 ± 0.1

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Авторлар туралы

A. Kuzin

Moscow Pedagogical State University; Bauman Moscow State Technical University

Хат алмасуға жауапты Автор.
Email: av.kuzin@mpgu.su
Ресей, Moscow; Moscow

A. Lobanov

Moscow Pedagogical State University

Email: av.kuzin@mpgu.su
Ресей, Moscow

V. Shelonzev

Omsk Humanitarian Academy

Email: av.kuzin@mpgu.su
Ресей, Omsk

E. Eliseeva

Bauman Moscow State Technical University

Email: av.kuzin@mpgu.su
Ресей, Moscow

A. Samadov

Tajik National University

Email: av.kuzin@mpgu.su
Тәжікстан, Dushanbe

Әдебиет тізімі

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Жүктеу
2. Fig. 1. Dependence of G on time t for magnetite when dissolved in orthophosphoric acid of different concentrations (mol/l): 1 – 6.67, 2 – 5.0, 3 – 3.33, 4 – 2.50, 5 – 1.67, 6 – 1.33, 7 – 1; dots – experimental data, lines – graphical representation of the transformed equation (1).

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3. Fig. 2. Dependence of G on time t for magnetite when dissolved in sulfuric acid of different concentrations (mol/l): 1 – 5.55, 2 – 4.58, 3 – 3.71, 4 – 2.91, 5 – 2.14, 6 – 1.60, 7 – 1.23; the designations are the same as in Fig. 1.

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4. Fig. 3. Dependence of G on time t for magnetite during its dissolution in orthophosphoric and sulfuric acids (with concentrations of 2.17 and 3.25 mol/l, respectively) and their mixtures: 1 – H3PO4, 2 – H2SO4 + H3PO4 in a ratio of 1:9, 3 – H2SO4 + H3PO4 in a ratio of 1:4, 4 – H2SO4 + H3PO4 in a ratio of 1:1, 5 – H2SO4 + H3PO4 in a ratio of 4:1, 6 – H2SO4; the designations are the same as in Fig. 1.

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5. Fig. 4. Dependence of the proportion of dissolved magnetite (α) on the reduced time (t/t0.5) during its dissolution in orthophosphoric and sulfuric acids; dots are experimental data, lines are a graphical representation of the transformed equation –ln(1 - α) = A sh(Wi t) = A sh(τ) for different values of the constant A: 1 – 10, 2 – 1, 3 – 0.1, 4 – 0.01, 5 – 0.001.

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6. Fig. 5. Dependence of the logarithm of the specific dissolution rate (W) of magnetite on the logarithm of the concentrations (C) of orthophosphoric (1) and sulfuric (2) acids.

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Метадеректер
7. Fig. 6. a – Dependence of G for magnetite on time t in 1.67 M phosphoric acid (313 K) with the addition of iron(II) ions of different molar concentrations: 1 – 2.24 × 10–2 M, 2 – 4.48 × 10–3, 3 – 4.48 × 10–4, 4 – 1.43 × 10–4, 5 – 7.16 × 10–5, 6 – 1.43 × 10–5, 7 – 1.43 × 10–6, 8 – 0. b – The same dependence with the addition of iron(III) ions of different concentrations: 1 – 0 M, 2 – 8.95 × 10–6 M, 3 – 1.79 × 10–5 M, 4 – 4.48 · 10–5 M.

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8. Fig. 7. Polarization curves E–lg ϳ for a magnetite electrode in solutions of orthophosphoric (1 ′, 1″; 2 ′, 2 ″) and sulfuric (1, 2) acids at pH 0.39 (1, 1 ′, 1 ″) and 0.63 (2, 2 ′, 2 ″); 1 ′, 1 ″ – the first and 2 ′, 2 ″ – the second maxima; lines – graphical representation of the equation of ion-proton exchange theory, dots – experimental data.

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