Abstract
ABSTRACT The spontaneous combustion of coal poses a serious threat to production and environmental safety. Currently, scholars have conducted extensive research on the mechanisms and prevention methods of coal spontaneous combustion. However, these studies have not sufficiently addressed the changes in coal’s acid-base properties during combustion and their impact on environmental pH balance. This gap hinders a comprehensive understanding of coal combustion and precise fire suppression. This study focuses on the changes in the acid-base properties of coal during critical periods of spontaneous combustion prevention. The results showed that as the temperature increased, BJG becomes more alkaline, with a pH of 8.08 at 75°C, while HLS becomes more acidic, with a pH as low as 5.14. The aqueous solutions mainly contained SO4 2-, CO3 2-, and HCO3 −, with the SO4 2- concentration in HLS being about 200 times higher than in BJG. Additionally, this study innovatively analyzed the impact of organic substances on the acid-base properties of coal. It was found that the content of organic groups, mainly -COOH, increased by over 300%. However, the influence of pyrite is greater than that of organic acids and CO2. Furthermore, the consumption of H+ by minerals significantly reduces the acidity of the solution.
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