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阐述了密县风化煤的煤质情况和用该风化煤制备腐植酸及其盐的应用．介绍了用密县腐植酸类物质处理工业用水和重金属废水等方面的用途．说明开发应用密县风化煤的重要意义。
The coal quality of weathered coal in Mi County and the application of humic acid and its salt to the weathered coal were expounded. Introduced with the use of humic acid in dense waters of industrial water and heavy metal waste water and other purposes. Explain the importance of developing and applying dense coal weathering coal.