Typical low rank coal samples in Binchang mining area were selected to analyze the microscopic characteristics of coal quality,dust particle size distribution test,coal dust microscopic characteristics test,dust composition analysis test and dust contact angle measurement were carried out respectively,the influence of micro-surface morphology characteristics of low rank coal on its wettability was analyzed.The test results show that the particle size of rock dust is larger than that of coal dust,and the surface of coal sample is rough and has many pores,the mineral components are mainly quartz and kaolinite.Quartz is an oxide primary mineral with good wettability.Kaolinite is a clay mineral with poor wettability,the low rank coal samples in the test are hydrophobic dust.
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