The application of polyacrylamide (PAM) in coal-fired beneficiation plants mainly focuses on the following aspects:

1. Flocculant: In the process of coal washing, the coal will contain a large number of small particles and impurities, such as soil, rock debris, organic matter, etc. PAM, as a flocculant, can increase the size of these suspended solids, promote their aggregation into larger flocs, facilitate precipitation and separation, and thus improve coal washing efficiency.
2. Wastewater treatment: The wastewater generated during coal washing usually contains high concentrations of particulate matter and organic matter. PAM can be used as a flocculant to treat suspended solids in wastewater, collecting them into larger flakes that are easy to deposit and filter, and used for wastewater treatment.
3. Mud dewatering: The coal washing process produces a large amount of coal slurry or mud. PAM can be used as a dehydrating agent and added to drilling fluids to increase the solid content and reduce the moisture content, which is beneficial for subsequent processing and disposal.
4. Coal surface modification: PAM can absorb the surface of coal, change its surface properties, improve coal flotation efficiency, and enhance washing effect.

When using PAM, it is necessary to make reasonable choices and controls based on the specific coal washing process and coal properties. At the same time, according to the characteristics of the wastewater and the target treatment effect, adjust the dosage and treatment conditions of PAM to obtain the best carbon washing wastewater effect.