What is the maximum percentage of moisture that coal dust can retain?

The maximum percentage of moisture that coal dust can retain is a critical consideration in coal mining and handling operations. A moisture retention level of 20% is both practical and indicative of the typical properties associated with various grades of coal.

At this level, moisture does not significantly impact the combustion properties or the overall handling and transportation of coal, which is essential for efficiency in operations. Higher moisture levels can lead to increased weight and reduce heating value, while also affecting the dusting behavior and the risk of spontaneous combustion.

Understanding this property is crucial for foremen and managers in ensuring compliance with safety regulations and optimizing the coal's effectiveness in applications such as energy production. This knowledge aids in performing proper assessments for storage, transportation, and the preparation of coal for efficient use.