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A Thermodynamic Analysis on the Roasting of Pyrite

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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Minerals 2019, 9(4), 220; https://doi.org/10.3390/min9040220
Received: 2 March 2019 / Revised: 31 March 2019 / Accepted: 5 April 2019 / Published: 8 April 2019
(This article belongs to the Section Mineral Processing and Metallurgy)
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Abstract

A series of thermodynamic calculations are performed for the roasting of pyrite in changing temperatures and atmospheres. The relationship between ΔrGθ and temperature in the range of T = 300–1200 K shows that, depending on the atmosphere it is in, reactions of pyrolysis, oxidation or reduction can occur. Both the pyrolysis of pyrite in an inert atmosphere and its oxidation by oxygen can form pyrrhotite (mainly Fe0.875S and FeS), but the temperature required for oxidation is much lower than that for pyrolysis. In an oxygen-containing atmosphere, the isothermal predominance areas for the Fe–S–O system indicate that a change in temperature and oxygen partial pressure can lead the pyrite to undergo desulphurization to pyrrhotite (FeS2 → Fe0.875S/FeS) or iron oxides (FeS2 → Fe3O4/Fe2O3), or sulphation to iron sulphates (FeS2 → FeSO4/Fe2(SO4)3). The presence of carbon is beneficial to the desulphurization of pyrite under an oxidizing atmosphere since iron sulphates can be converted to iron oxides at very low levels of PCO/PCO2. Results presented in this paper offer theoretical guidance for the optimization of roasting of pyrite for different purposes. View Full-Text
Keywords: pyrite roasting; thermodynamic analysis; predominance areas; pyrolysis; desulphurization; sulphation pyrite roasting; thermodynamic analysis; predominance areas; pyrolysis; desulphurization; sulphation
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Zhang, Y.; Li, Q.; Liu, X.; Xu, B.; Yang, Y.; Jiang, T. A Thermodynamic Analysis on the Roasting of Pyrite. Minerals 2019, 9, 220.

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