Polyacrylamide agents are widely used and have a good flocculation effect, but high-quality products will also be affected by other factors in the application, resulting in poor results. In the treatment of coal-washing wastewater, the following issues need to be paid attention to when using polyacrylamide:
1. Pay attention to coal quality
In mine production, in order to distinguish the grade of coal and improve the utilization rate of coal, it is necessary to wash the coal with water. Coal washing itself is an environmental protection method, but it also brings pollution, that is, coal washing wastewater, which contains fine coal powder, sand, clay, shale, etc., and its particle size is mostly less than 50um. Therefore, coal washing wastewater can pass through Polyacrylamide interacts with particles in water to coagulate and precipitate coal slime particles, which is a standardized and effective treatment method for coal washing wastewater. However, for some small coal washing plants, they may not have their own coal mines, so the sources of coal in the production process are different, which will lead to differences in coal quality, so the use of polyacrylamide at this time may cause poor flocculation effects. Therefore, when polyacrylamide is used in coal washing wastewater, attention should be paid to coal quality.
2. When polyacrylamide is used in coal washing wastewater, attention should be paid to the pH value of the wastewater
Any type of sewage is constantly changing, so in any case, the use of chemicals needs to be tested first. Even for commonly used chemicals, changes in a certain link of sewage will affect the overall treatment effect. The PH value is an important indicator for polyacrylamide, which is used for coal washing sewage treatment. The type of polyacrylamide should be consistent with the PH value of coal slime water. Generally, anionic polyacrylamide is suitable for alkaline slime water, and cationic polyacrylamide is suitable for partial acidic coal slime water, anionic and cationic polyacrylamide are mixed, and the effect of flocculation and sedimentation of coal slime water is better.