Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings

Alexander M. Klyushnikov; Rosa I. Gulyaeva; Evgeniy N. Selivanov; Sergey M. Pikalov

doi:10.1007/s12613-020-2109-x

Volume 28 Issue 9

Sep. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(9): 1469-1477

Alexander M. Klyushnikov, Rosa I. Gulyaeva, Evgeniy N. Selivanov, and Sergey M. Pikalov, Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings, Int. J. Miner. Metall. Mater., 28(2021), No. 9, pp. 1469-1477. https://doi.org/10.1007/s12613-020-2109-x

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Alexander M. Klyushnikov, Rosa I. Gulyaeva, Evgeniy N. Selivanov, and Sergey M. Pikalov, Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings, Int. J. Miner. Metall. Mater., 28(2021), No. 9, pp. 1469-1477. https://doi.org/10.1007/s12613-020-2109-x

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Research Article

Kinetics and mechanism of oxidation for nickel-containing pyrrhotite tailings

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Corresponding author:
Alexander M. Klyushnikov E-mail: amk8@mail.com
Received: 12 February 2020; Revised: 4 May 2020; Accepted: 25 May 2020; Available online: 27 May 2020

Abstract

Abstract

X-ray powder diffraction, scanning electron microscopy, energy dispersive spectroscopy, thermogravimetry, differential scanning calorimetry, and mass spectrometry have been used to study the products of nickel-containing pyrrhotite tailings oxidation by oxygen in the air. The kinetic triplets of oxidation, namely, activation energy (E_a), pre-exponential factor (A), and reaction model (f(α)) being a function of the conversion degree (α), were adjusted by regression analysis. In case of a two-stage process representation, the first step proceeds under autocatalysis control and ends at α = 0.42. The kinetic triplet in the first step is E_a = 262.2 kJ/mol, lg A = 14.53 s⁻¹, and f(α) = (1 – α)^4.11(1 + 1.51 × 10^–4α). For the second step, the process is controlled by the two-dimensional diffusion of the reactants in the layer of oxidation products. The kinetic triplet in the second step is Е_a = 215.0 kJ/mol, lg A = 10.28 s⁻¹, and f(α) = (–ln(1 – α))^–1. The obtained empirical formulae for the rate of pyrrhotite tailings oxidation reliably describe the macro-mechanism of the process and can be used to design automatization systems for roasting these materials.
- pyrrhotite tailings;
- oxidation;
- thermogravimetry;
- kinetics;
- mechanism

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