A mass-energy coupling treatment process for stainless steel pickling sludge using high-temperature argon-oxygen decarburization （AOD） slag

FENG Xiaoming; ZHAO Zheng; YU Jian; ZHANG Yanling

doi:10.13205/j.hjgc.202507002

Volume 43 Issue 7

Jul. 2025

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FENG Xiaoming, ZHAO Zheng, YU Jian, ZHANG Yanling. A mass-energy coupling treatment process for stainless steel pickling sludge using high-temperature argon-oxygen decarburization （AOD） slag[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 10-17. doi: 10.13205/j.hjgc.202507002

Citation:

FENG Xiaoming, ZHAO Zheng, YU Jian, ZHANG Yanling. A mass-energy coupling treatment process for stainless steel pickling sludge using high-temperature argon-oxygen decarburization （AOD） slag[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 10-17. doi: 10.13205/j.hjgc.202507002

Citation:

FENG Xiaoming, ZHAO Zheng, YU Jian, ZHANG Yanling. A mass-energy coupling treatment process for stainless steel pickling sludge using high-temperature argon-oxygen decarburization （AOD） slag[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 10-17. doi: 10.13205/j.hjgc.202507002

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A mass-energy coupling treatment process for stainless steel pickling sludge using high-temperature argon-oxygen decarburization （AOD） slag

doi: 10.13205/j.hjgc.202507002

1. Jianlong Steel Holdings Co., Ltd., Beijing 100070, China;
2. State Key Laboratory for Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
3. Beijing Beike Environmental Engineering Co., Ltd., Beijing 100083, China

Received Date: 2024-05-02
Accepted Date: 2024-08-05
Rev Recd Date: 2024-07-31

Available Online: 2025-09-11

Abstract

Abstract

A technical route for the coupled treatment of stainless steel pickling sludge based on mass-energy coupling is proposed in this paper. This process features a groundbreaking technical route， which can synergistically recover energy and resources from argon-oxygen decarburization （AOD） slag and carry out eco-friendly detoxification of hazardous pickling sludge. Through systematic laboratory experiments， combined with computational thermodynamics modeling and SEM - EDS analysis， the migration modes and phase transformation mechanisms of key elements（such as S， Cr， and Fe） in the molten AOD slag-sludge mixed system were studied. The results showed that during the pretreatment stage of carbon-containing pickling sludge particles， the risk of sulfur pollution was effectively suppressed， and no sulfur-containing gas emission was detected. Subsequently， in the thermal reduction stage in the AOD slag bath （operating temperature：1550℃）， the distribution ratio of sulfur in the gas phase was 0.55%， and the sulfur fixation rate in the slag phase reached 99.68% through the formation of stable sulfides. The recovery rate of high-value metal components mainly composed of Fe-Cr alloy was approximately 90%. The basic mechanism analysis revealed a multi-stage reaction pathway： the redox transformation within the particles involved sulfate reduction （CaSO₄→CaS）， spinel crystallization （formation of FeCr₂O₄）， and coarsening of metal particles （Fe—Cr—C）. The interfacial interactions during the slag dissolution process promoted the complex reconstruction of MgCr₂O₄ spinel while enabling the thermodynamically stable encapsulation of CaS in the slag matrix. This study lays a theoretical and technical foundation for the industrial-scale implementation of the energy-coupled co-processing system and presents a paradigm shift for the stainless steel manufacturing industry towards a circular economy.
- AOD slag,
- stainless steel pickling sludge,
- mass-energy coupling,
- phase transformation,
- dissolution pathway

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References(30)

References

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