在将煤研磨成粉末后，加入弱无机酸，以从煤中萃取稳定性添加剂。
After the coal is ground into a powder, a weak mineral acid is added to extract stabilizing additives from the coal.
指出在接触角测量过程中，研磨煤样要比成型粉煤测量效果好。
Grinding coal sample result is better than the forming fine coal during contact Angle measurement.
双进双出磨煤机是在电厂系统中广泛应用的一种制粉设备，它具有能耗低、生产效率高、研磨煤种范围广等优点。
BBD Ball mill is a widely used milling device in power plant system. It has the advantages of low energy consumption, high efficiency, widely range of grinding coal, and so on.
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