To build a modern coal washing plant, the first thing to do is to purchase suitable coal washing equipment and select low-cost coal washing processes. Before purchasing coal preparation equipment and selecting coal preparation processes, we should first analyze and evaluate the coal quality, that is, conduct "pulse diagnosis" of coal. Coal preparation processes rely on the basic materials of washed raw coal to analyze the coal quality, grasp the precise characteristics of raw coal, and plan useful coal preparation processes suitable for the selected raw coal, creating greater economic benefits for the washing and processing of coal preparation plants.

　　As is well known, differences in coal occurrence occur due to the different coal forming environments and conditions. Therefore, the coal quality varies greatly in different coalfields and mining areas. Sometimes, even if they belong to the same coalfield, the changes and differences in coal quality are also significant in different mines, mining areas, and layers. How to accurately determine the "pulse" number of the washed raw coal is a fundamental issue that needs to be emphasized in coal preparation process planning. So, the crucial issue in building a modern coal preparation plant is that the coal preparation process planning needs to be tailored to the different coal quality characteristics of different mining areas.