In order to study the effect of pH of aqueous solution on coal oxidation,the changes of adsorption isotherm and pore structure parameters of coal samples treated with aqueous solution of different pH values were studied by low-temperature nitrogen ad-sorption experiment.The fractal dimension of each coal sample was calculated separately for the high-pressure and low-pressure phas-es of the adsorption process.By using low-temperature oxidation experiments,the oxygen consumption and CO production during low-temperature oxidation of coal were analyzed,and the corresponding apparent activation energies of the coal samples oxidation were calculated.The results show that the similar isotherm lines of treated coal samples and raw coal samples are type Ⅱ in the IUPAC classification.The surface of coal samples treated with aqueous solutions is rougher,the specific surface area is larger,and the tenden-cy of coal spontaneous combustion is larger.The oxygen consumption,CO production and apparent activation energy in oxidation of treated coal samples were also higher than those of raw coal.Under the same water content,the acidic aqueous solution promotes the occurrence of coal spontaneous combustion,while the alkaline aqueous solution inhibits the occurrence of coal spontaneous combus-tion.The higher the acidity of the aqueous solution is,the more obvious the effect of promoting coal spontaneous combustion.
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