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

Cover Page

Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription or Fee Access

Abstract

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

Full Text

Restricted Access

About the authors

A. V. Kuzin

Moscow Pedagogical State University; Bauman Moscow State Technical University

Author for correspondence.
Email: av.kuzin@mpgu.su
Russian Federation, Moscow; Moscow

A. V. Lobanov

Moscow Pedagogical State University

Email: av.kuzin@mpgu.su
Russian Federation, Moscow

V. A. Shelonzev

Omsk Humanitarian Academy

Email: av.kuzin@mpgu.su
Russian Federation, Omsk

E. A. Eliseeva

Bauman Moscow State Technical University

Email: av.kuzin@mpgu.su
Russian Federation, Moscow

A. S. Samadov

Tajik National University

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

References

  1. Larionov V.S. Dis. ... candidate of technical sciences. M.: Mosk. State Evening. Metallurgist. In-t, 2001.
  2. Cherny S.A. Dis. ... candidate of economic sciences. М.: Mosk. State Un-t, 2009.
  3. Karpova S.G., Ol’khov A.A., Krivandin A.V. et al. // Polymer Sci. Ser. A. 2019. V. 61. P. 70. https://doi.org/10.1134/S0965545X19010140
  4. Lobanov A.V., Golubeva E.N., Zubanova E.M. et al. // High Energy Chem. V. 43. P. 384. https://doi.org/10.1134/S0018143909050099
  5. Gorichev I.G., Kutepov A.M., Gorichev A.I. et al. // Kinetics and mechanism of dissolution of iron oxides and hydroxides in acidic environments. M.: RUDN, 1999 [in Russian].
  6. Gorichev I.G., Mikha’lchenko I.S. // Protect. of metals. 1989. V. 25. № 4. P. 451.
  7. Marchenko Z. Photometric determination of elements. Chichester: Horwood, 1976.
  8. Delmon B. Introduction à la cinétique hétérogène. Paris: Éditions Technip, 1970.
  9. Rozovsky A.Ya. Heterogeneous chemical reactions. M.: Nauka, 1980. [in Russian].
  10. Ivanova O.V., Khorishko B.A., Kizim N.F. et al. // Advances in Chem. and Chem. Technol. 2016. V. 30. № 3 (172). P. 49.
  11. Kuzin A.V., Gorichev I.G., Shelontsev V.A. et al. // Moscow University Chem. Bulletin. 2021. V. 76. №. 6. C. 398. https://doi.org/10.3103/S0027131421060055
  12. Avdeev Ya.G., Andreeva T.E., Panova A.V. et al. // Intern. J. Corrosion Scale Inhibition. 2020. Т. 9. № 2. C. 538. https://doi.org/10.17675/2305-6894-2020-9-2-9
  13. Panova A.V., Avdeev Ya.G., Andreeva T.E. et al. // Prot. Metals Phys. Chem. Surf. 2021. Т. 57. № 7. C. 1289. https://doi.org/10.1134/S2070205121070133
  14. Avdeev Ya.G., Andreeva T.E. et al. // Advances in Chem. and Chem. Technology. 2018. V. 32. № 13 (209). P. 63.
  15. Kuzin A.V., Gorichev I.G., Batrakov V.V. et al. // Russ. Metal. (Metally). 2014. V. 2014. № 1. P. 33. https://doi.org/10.1134/S003602951401008X
  16. Lukovtsev P.D. Dis. ... Doctors of Chem. Sci. М.: The Institute of Physical Chem. and Electrochem. of the USSR, 1952.
  17. Lukovtsev P.D. // Soviet Electrochem. 1968. V. 4. № 4. 337.
  18. Fedorockova A., Raschman P. // Chemicke Listy. 2006. V. 100. P. 337.
  19. Denisov E.T. Rate constants of homolytic liquid-phase reactions. M.: Nauka, 1971 [in Russian].
  20. Alymov M.I., Seplyarskii B.S., Vadchenko S.G. et al. // Russ. J. Phys. Chem. B. 2021. V. 15. P. 352. https://doi.org/10.1134/S1990793121020135
  21. Yuriev B.P., Dudko V.A. // Russ. J. Phys. Chem. B. 2022. V. 16. P. 31. https://doi.org/10.1134/S1990793122010171
  22. Gromov V.F., Ikim M.I., Gerasimov G.N. et al. // Russ. J. Phys. Chem. B. 2022. V. 16. P. 138. https://doi.org/10.1134/S1990793122010055
  23. Yuriev B.P., Dudko V.A. // Russ. J. Phys. Chem. B. 2023. V. 17. P. 60. https://doi.org/10.1134/S199079312301030X

Supplementary files

Supplementary Files
Action
1. JATS XML
Download
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).

Download (73KB)
Indexing metadata
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.

Download (83KB)
Indexing metadata
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.

Download (93KB)
Indexing metadata
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.

Download (118KB)
Indexing metadata
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.

Download (58KB)
Indexing metadata
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.

Download (194KB)
Indexing metadata
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.

Download (99KB)
Indexing metadata

Copyright (c) 2024 Russian Academy of Sciences