The application of polyacrylamide (PAM) in coal-washing plant is mainly concentrated in the following aspects:
- Flocculant: In the coal washing process, there will be a large number of fine particles and impurities in the coal, such as soil, rock debris, organic matter, and so on. PAM as a flocculant can increase the particle size of these suspended particles, promote their aggregation into larger floc, easy settlement and separation, so as to improve the efficiency of coal washing.
- Wastewater treatment: The wastewater produced in the coal washing process usually contains high concentrations of solid particles and organic matter. PAM can be used as a flocculant to treat suspended particles in wastewater, so that they gather into larger floc, easy to precipitate and filter, so as to purify wastewater.
- Mud dehydration: In the process of coal washing, a large amount of coal slime or mud is produced. PAM can be used as a dehydrating agent, added to the mud, improve the solid content of the mud, and reduce the moisture content, so as to facilitate subsequent treatment and disposal.
- Coal surface modification: PAM can adsorb the surface of coal, change its surface properties, improve the flotation performance of coal, and increase the washing effect.
When using PAM, it is necessary to make reasonable selection and control according to the specific coal-washing process and the nature of coal. At the same time, according to the characteristics of wastewater and the target treatment effect, the amount of PAM and treatment conditions are adjusted to obtain the best coal washing and wastewater treatment effect.
