A Thermodynamic Analysis on the Roasting of Pyrite
A series of thermodynamic calculations are performed for the roasting of pyrite in changing temperatures and atmospheres. The relationship between Δ<sub>r</sub>G<sup>θ</sup> and temperature in the range of T = 300–1200 K shows that, depending on th...
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2019-04-01
|
Series: | Minerals |
Subjects: | |
Online Access: | https://www.mdpi.com/2075-163X/9/4/220 |
id |
doaj-305b8335831840f19e275e5096e7757e |
---|---|
record_format |
Article |
spelling |
doaj-305b8335831840f19e275e5096e7757e2020-11-24T21:51:08ZengMDPI AGMinerals2075-163X2019-04-019422010.3390/min9040220min9040220A Thermodynamic Analysis on the Roasting of PyriteYan Zhang0Qian Li1Xiaoliang Liu2Bin Xu3Yongbin Yang4Tao Jiang5School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaA series of thermodynamic calculations are performed for the roasting of pyrite in changing temperatures and atmospheres. The relationship between Δ<sub>r</sub>G<sup>θ</sup> 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 Fe<sub>0.875</sub>S 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 (FeS<sub>2</sub> → Fe<sub>0.875</sub>S/FeS) or iron oxides (FeS<sub>2</sub> → Fe<sub>3</sub>O<sub>4</sub>/Fe<sub>2</sub>O<sub>3</sub>), or sulphation to iron sulphates (FeS<sub>2</sub> → FeSO<sub>4</sub>/Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>). 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 P<sub>CO</sub>/P<sub>CO2</sub>. Results presented in this paper offer theoretical guidance for the optimization of roasting of pyrite for different purposes.https://www.mdpi.com/2075-163X/9/4/220pyrite roastingthermodynamic analysispredominance areaspyrolysisdesulphurizationsulphation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yan Zhang Qian Li Xiaoliang Liu Bin Xu Yongbin Yang Tao Jiang |
spellingShingle |
Yan Zhang Qian Li Xiaoliang Liu Bin Xu Yongbin Yang Tao Jiang A Thermodynamic Analysis on the Roasting of Pyrite Minerals pyrite roasting thermodynamic analysis predominance areas pyrolysis desulphurization sulphation |
author_facet |
Yan Zhang Qian Li Xiaoliang Liu Bin Xu Yongbin Yang Tao Jiang |
author_sort |
Yan Zhang |
title |
A Thermodynamic Analysis on the Roasting of Pyrite |
title_short |
A Thermodynamic Analysis on the Roasting of Pyrite |
title_full |
A Thermodynamic Analysis on the Roasting of Pyrite |
title_fullStr |
A Thermodynamic Analysis on the Roasting of Pyrite |
title_full_unstemmed |
A Thermodynamic Analysis on the Roasting of Pyrite |
title_sort |
thermodynamic analysis on the roasting of pyrite |
publisher |
MDPI AG |
series |
Minerals |
issn |
2075-163X |
publishDate |
2019-04-01 |
description |
A series of thermodynamic calculations are performed for the roasting of pyrite in changing temperatures and atmospheres. The relationship between Δ<sub>r</sub>G<sup>θ</sup> 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 Fe<sub>0.875</sub>S 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 (FeS<sub>2</sub> → Fe<sub>0.875</sub>S/FeS) or iron oxides (FeS<sub>2</sub> → Fe<sub>3</sub>O<sub>4</sub>/Fe<sub>2</sub>O<sub>3</sub>), or sulphation to iron sulphates (FeS<sub>2</sub> → FeSO<sub>4</sub>/Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>). 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 P<sub>CO</sub>/P<sub>CO2</sub>. Results presented in this paper offer theoretical guidance for the optimization of roasting of pyrite for different purposes. |
topic |
pyrite roasting thermodynamic analysis predominance areas pyrolysis desulphurization sulphation |
url |
https://www.mdpi.com/2075-163X/9/4/220 |
work_keys_str_mv |
AT yanzhang athermodynamicanalysisontheroastingofpyrite AT qianli athermodynamicanalysisontheroastingofpyrite AT xiaoliangliu athermodynamicanalysisontheroastingofpyrite AT binxu athermodynamicanalysisontheroastingofpyrite AT yongbinyang athermodynamicanalysisontheroastingofpyrite AT taojiang athermodynamicanalysisontheroastingofpyrite AT yanzhang thermodynamicanalysisontheroastingofpyrite AT qianli thermodynamicanalysisontheroastingofpyrite AT xiaoliangliu thermodynamicanalysisontheroastingofpyrite AT binxu thermodynamicanalysisontheroastingofpyrite AT yongbinyang thermodynamicanalysisontheroastingofpyrite AT taojiang thermodynamicanalysisontheroastingofpyrite |
_version_ |
1725880248615043072 |