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Study on thermal and flame retardant properties of hydrated phase change materials for preventing coal spontaneous combustion
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Jingjing LI1, Yi LU**, 1, 2, 3, Shuzhen SHAO1, Shiliang SHI1, Zhengjing SHI4, Bo YU5
China Safety Science Journal | 2025, 35(12) : 164 - 171
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China Safety Science Journal | 2025, 35(12): 164-171
• Safety engineering technology •
Study on thermal and flame retardant properties of hydrated phase change materials for preventing coal spontaneous combustion
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Jingjing LI1, Yi LU**, 1, 2, 3, Shuzhen SHAO1, Shiliang SHI1, Zhengjing SHI4, Bo YU5
Affiliations
  • 1School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Hunan Xiangtan 411201, China
  • 2Hunan Engineering Research Center for Fire and Explosion Prevention Materials and Equipment in Underground Spaces, Xiangtan Hunan 411201, China
  • 3Key Laboratory of Fire and Explosion Prevention and Emergency Technology in Hunan Province, Xiangtan Hunan 411201, China
  • 4Technical Center of China Coal Xinji Energy Co., Ltd., Huainan Anhui 232000, China
  • 5Chahasu Coal Mine, Guodian Construction Investment Inner Mongolia Energy Co., Ltd., Ordos Inner Mongolia 017209, China
Published: 2025-12-28 doi: 10.16265/j.cnki.issn1003-3033.2025.12.0064
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To effectively suppress the transition of coal spontaneous combustion oxidation in goaf areas into the accelerated stage, a stable and high-heat-storage PCM was prepared using ammonium aluminum sulfate dodecahydrate and magnesium sulfate heptahydrate as raw materials. Through differential scanning calorimetry tests, solid-liquid transition tests, programmed heating tests, infrared spectroscopy, thermal insulation tests, and microscopic analysis, PCM thermal properties, the driving mechanism of solid-liquid transition, heat storage capacity, and coal oxidation inhibitory performance were studied. The test results show that the developed material has a phase transition temperature of 66.8℃, a latent heat of phase transition of 300.708 J/g, and a relatively low specific heat capacity during the heating process. The melting time exhibits an exponential decrease with increasing temperature, and a dense covering film forms after melting. When the material is added at a mass fraction of 15%, the inhibitory rate reaches 41%. Under a 500℃ heat source, with a material thickness of 30 mm, the effective thermal insulation time reaches 65 minutes.

coal spontaneous combustion  /  hydrated phase change materials (PCM)  /  inhibition  /  insulation  /  infrared spectra.
Jingjing LI, Yi LU, Shuzhen SHAO, Shiliang SHI, Zhengjing SHI, Bo YU. Study on thermal and flame retardant properties of hydrated phase change materials for preventing coal spontaneous combustion[J]. China Safety Science Journal, 2025 , 35 (12) : 164 -171 . DOI: 10.16265/j.cnki.issn1003-3033.2025.12.0064
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Year 2025 volume 35 Issue 12
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79
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Article Info
doi: 10.16265/j.cnki.issn1003-3033.2025.12.0064
  • Receive Date：2025-06-30
  • Online Date：2026-07-09
  • Published：2025-12-28
Article Data
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History
  • Received：2025-06-30
  • Revised：2025-09-21
Funding
Affiliations
    1School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Hunan Xiangtan 411201, China
    2Hunan Engineering Research Center for Fire and Explosion Prevention Materials and Equipment in Underground Spaces, Xiangtan Hunan 411201, China
    3Key Laboratory of Fire and Explosion Prevention and Emergency Technology in Hunan Province, Xiangtan Hunan 411201, China
    4Technical Center of China Coal Xinji Energy Co., Ltd., Huainan Anhui 232000, China
    5Chahasu Coal Mine, Guodian Construction Investment Inner Mongolia Energy Co., Ltd., Ordos Inner Mongolia 017209, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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