Which industries can use polyacrylamide flocculant
Polyacrylamide flocculant can be classified into anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide and zwitterionic polyacrylamide. The first three kinds of polyacrylamide are commonly used, which industries can use polyacrylamide?
Before talking about the use of polyacrylamide flocculant, lets introduce this product. Zwitterionic polyacrylamide (zwitterionic polyacrylamide) is prepared by hydrolysis copolymerization of vinyl amide and vinyl cationic monomer acrylamide. Infrared spectrum analysis showed that there were not only negative charge of carboxyl group but also positive charge of vinyl group in the product chain after acrylamide hydrolysis. Therefore, zwitterionic irregular polymers with positive and negative charges in the molecular chain were formed.
Zwitterionic polyacrylamide flocculant is used in water treatment. In some wastewater treatment, the treatment effect of single polyacrylamide can not meet the reasonable requirements, cationic polyacrylamide and anionic polyacrylamide need to be used at the same time. However, if these two products are not used properly, they will react, produce white precipitate and lose the original use effect.
At this time, zwitterionic polyacrylamide can solve this problem well, because it has the characteristics of zwitterions, it can complete the coordination of anions and cations, and will not produce precipitation, so the treatment effect is more effective.
Another application of zwitterionic polyacrylamide is as profile control and plugging agent in oilfield development. The performance of the new zwitterionic profile control and plugging agent is higher than that of other single ion profile control and plugging agents.
What is the difference between polyacrylamide for coal washing and common polyacrylamide
Coal mined by coal mine usually contains some impurities, which can be separated by washing coal through gravity difference between coal and water impurities. Coal is suspended on it and impurities sink to the bottom. In addition, groundwater will seep from the mine, and will be polluted by the coal in the mine, which can not meet the discharge standard. High quality water can be obtained after purification with polyacrylamide specially used for coal washing. So what is the difference between polyacrylamide for coal washing and ordinary polyacrylamide?
Coal washing polyacrylamide flocculant is different from ordinary polyacrylamide
Although the price of polyacrylamide for coal washing is slightly higher than that of ordinary polyacrylamide. However, the effect is quite different. The effect of Hancheng coal washing special polyacrylamide is several times higher than ordinary polyacrylamide. The effect of coal washing pressure filtration or groundwater discharge is very obvious, the reaction time is about 5 seconds, so many coal mines choose special flocculant for coal washing.
Mechanism of coal washing with Polyacrylamide flocculant
Polyacrylamide is used in the precipitation process to promote solid-liquid separation. Then it is sent to the thickener, and the clean water is recycled through the overflow of the thickener. The crushed clean coal is recovered by filtration and centrifugation. Polyacrylamide was added again during filtration and centrifugation to improve the separation efficiency. In order to meet the needs of users, we have produced polyacrylamide for coal washing, which has good effect on different coal mines and greatly reduces the dosage of reagent.
According to the selected slime water treatment process and the properties of slime water, it can be determined by experiments. Polyacrylamide for coal washing is one of the most commonly used flocculants for coal washing in China. However, there are many specifications and classifications of polyacrylamide, and its impact on coal washing wastewater, dosage, flocculation effect and sedimentation rate need to be very accurate judgment.