Research on characteristics of CaO-catalyzed pyrolysis of organic compounds in waste salt from lithium batteries

DONG Jun; HUANG Guolong; LI Shuqi; LI Yin; LI Shun; WANG Shifeng; WANG Fei

doi:10.13205/j.hjgc.202507020

Volume 43 Issue 7

Jul. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(7): 184-192

DONG Jun, HUANG Guolong, LI Shuqi, LI Yin, LI Shun, WANG Shifeng, WANG Fei. Research on characteristics of CaO-catalyzed pyrolysis of organic compounds in waste salt from lithium batteries[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 184-192. doi: 10.13205/j.hjgc.202507020

Citation:

DONG Jun, HUANG Guolong, LI Shuqi, LI Yin, LI Shun, WANG Shifeng, WANG Fei. Research on characteristics of CaO-catalyzed pyrolysis of organic compounds in waste salt from lithium batteries[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 184-192. doi: 10.13205/j.hjgc.202507020

Citation:

DONG Jun, HUANG Guolong, LI Shuqi, LI Yin, LI Shun, WANG Shifeng, WANG Fei. Research on characteristics of CaO-catalyzed pyrolysis of organic compounds in waste salt from lithium batteries[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 184-192. doi: 10.13205/j.hjgc.202507020

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Research on characteristics of CaO-catalyzed pyrolysis of organic compounds in waste salt from lithium batteries

doi: 10.13205/j.hjgc.202507020

1. Hangzhou Engineering Research Center for Key Technology Improvement and Application of Novel Bio-Based Materials, Ecology and Health Institute, Hangzhou Vocational and Technical College, Hangzhou 310018, China;
2. Zhejiang Zhenjing Environmental Technology Co., Ltd., Hangzhou 310020, China;
3. State Key Laboratory of Clean and Efficient Utilization of Energy, College of Energy Engineering, Zhejiang University, Hangzhou 310007, China

Received Date: 2024-11-29
Accepted Date: 2025-02-10
Rev Recd Date: 2025-01-12

Available Online: 2025-09-11

Abstract

Abstract

Pyrolysis of industrial waste salt is a promising technology for resource recovery， offering high-value salt products and effective waste reuse approaches. This study focused on the waste salt produced during the production of ethylene carbonate （VC） electrolyte for lithium batteries， examining its thermal treatment characteristics and the impact of catalytic pyrolysis on the removal of organic compounds. The results indicated that NaCl accounted for 79.0% of the waste salt’s mass fraction， with a total organic carbon （TOC） content of 38360 mg/kg. The organic composition primarily consisted of trimethylsilyl esters and cyclic siloxanes. Thermogravimetric analysis showed that both the combustion and pyrolysis processes of waste salt exhibited similar reaction stages： moisture removal （<130 ℃）， removal of low-boiling organic compounds （130 to 245 ℃）， removal of high-boiling organic compounds （260 to 470 ℃）， char combustion or pyrolysis （470 to 660 ℃）， and waste salt melting （>660 ℃）. The addition of CaO for catalytic pyrolysis facilitated the reduction of organic matter volatilization temperature， promoting the decomposition of organic compounds. The optimized conditions for catalytic pyrolysis in a tube furnace fixed-bed reactor were determined as follows： a CaO-to-waste salt mass ratio of 1∶3， a pyrolysis temperature of 600 ℃， and a residence time of 20 min. Through a process involving pyrolysis， screening， dissolution， filtration， chemical precipitation， and evaporation crystallization， regenerated salt was prepared. The crystalline salt had a NaCl content of 97.0%， a TOC content of 47 mg/kg， and an organic removal rate of 99.87% was achieved. This method provides a reference for the resource recovery of industrial waste salt.
- industrial waste salt,
- pyrolysis,
- catalytic pyrolysis,
- CaO,
- resource utilization

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References(34)

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