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Updated: Aug 30, 2025
09:31
Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
Published on: August 31, 2017
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Pyrolysis Behavior of Pyrite under a CO-H2 Atmosphere
Zhuang Zheng1, Yang You1, Jiabao Guo1
1College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
ACS Omega
|August 29, 2022
Summary
Pyrite (FeS2) transforms into iron sulfide (FeS) in blast furnaces, releasing hydrogen sulfide (H2S) and carbonyl sulfide (COS). Gas concentrations influence the type and temperature of these gaseous sulfide emissions.
Area of Science:
- Metallurgical Engineering
- Chemical Thermodynamics
- Environmental Science
Background:
- Controlling gaseous sulfide emissions in ironmaking is crucial for environmental and process efficiency.
- The transformation behavior of pyrite (FeS2) in blast furnaces, a key sulfur source, remains underexplored.
- Understanding pyrite pyrolysis is essential for managing sulfur in the top gas.
Purpose of the Study:
- To investigate the pyrolysis behavior of pyrite (FeS2) under a carbon monoxide (CO) and hydrogen (H2) atmosphere.
- To identify the gaseous sulfides formed during pyrite transformation.
- To elucidate the influence of CO and H2 concentrations on the pyrolysis products and reaction temperatures.
Main Methods:
- Pyrolysis experiments conducted on pyrite (FeS2) from 200 to 900 °C.
- Utilized thermal-gravimetric analysis and mass spectrometry to monitor reactions.
- Performed thermodynamic theoretical calculations to support experimental findings.
Main Results:
- Pyrite (FeS2) is predominantly reduced to iron sulfide (FeS) under CO-H2 atmospheres.
- Hydrogen sulfide (H2S) and carbonyl sulfide (COS) are the primary gaseous sulfides produced.
- Higher H2 concentration favors H2S formation and lowers reaction temperature; higher CO concentration promotes COS formation.
- The sequence of pyrolysis products with increasing temperature under a reductive CO-H2 atmosphere is COS → S → H2S → S2 → CS2.
Conclusions:
- The study elucidates the complex transformation pathways of pyrite in a blast furnace environment.
- Findings provide critical insights into controlling gaseous sulfide emissions (H2S and COS) by manipulating CO-H2 ratios.
- This research contributes to optimizing ironmaking processes for reduced environmental impact.
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