Polyacrylamide in the field of paper mill applications and preventive measures

    Polyacrylamide(PAM) for paper mills is widely used in the field of papermaking as a residing agent, filter aid, homogenizing agent, water treatment chemicals, etc. It can improve the quality of paper, improve the retention of fine fibers and fillers, and reduce the consumption of raw materials and environmental pollution. Its role is to be able to improve the quality of paper, improve the performance of pulp dewatering, improve the retention rate of fine fibers and fillers, reduce the consumption of raw materials and pollution of the environment. The effect of its use in papermaking depends on its average molecular weight, ionic nature, ionic strength and the activity of other copolymers. Nonionic paper mills special polyacrylamide PAM is mainly used to improve the filtration of pulp, increase dry paper strength, improve the retention rate of fibers and fillers; anionic paper mills special polyacrylamide is mainly used as wet and dry paper enhancers and resident agent; cationic paper mills special polyacrylamide is mainly used for papermaking wastewater treatment and filtration aid, and in addition to increase the retention of fillers also has a good effect. In addition, polyacrylamide PAM is also used in paper wastewater treatment and fiber recovery.

   Paper mill wastewater produced by the main characteristics of the water volume and high color, suspended solids content, high concentration of organic matter, the wastewater treatment is generally the main solution to the problem of removing SS and COD, the more popular methods of treatment of paper wastewater flotation, sedimentation, physical and biochemical treatment combined with the use of flotation or precipitation methods, by adding coagulants (polymerization of aluminum chloride) and coagulants, which can remove the vast majority of SS. This can remove most of the SS, but also can remove most of the non-dissolved COD and part of the dissolved COD and BOD5. paper mills special polyacrylamide generally use 15 million molecular weight above the anionic polyacrylamide effect is more ideal (to do the test selection, see what kind of hydrolysis degree of your sewage water quality suitable for polyacrylamide PAM products). If the combination of physical and biochemical treatment, the general physical and biochemical treatment process is wastewater → screen → regulation → sedimentation or air flotation → A/O or contact oxidation → second sedimentation tank → discharge, in this treatment process is generally used in the cationic polyacrylamide.

Notes on polyacrylamide for paper mills:

1, dissolution temperature: dissolution *s a certain temperature to accelerate the rate of dissolution. But the temperature is too high, and will make the polymer molecular chain breakage, reduce the use of the effect, the more appropriate dissolution temperature of 50 --- 60 ℃.

2, stirring conditions: dissolution should avoid too strong shear stirring, too strong stirring will make the molecular chain fracture, thus reducing the use of effect. Stirring should adopt low-speed slurry blade, such as anchor type, frame type, multi-layer slurry type and so on. The mixing speed is about 60 rpm. Transportation should also avoid the use of high-speed centrifugal pumps, more suitable for the use of piston pumps or diaphragm pumps.

3, uniform dispersion of feeding: polyacrylamide PAM dissolution of the key links, is the uniform dispersion of feeding. After starting the mixer, use the mechanical vibration sieve feeding (screen mesh 10 mesh), try to avoid "large lumps", "fish-eye" insoluble particles, so that polypropylene amide is fully dissolved, play a good use of the effect.

4, avoid and iron solution: in the dissolution and mixing and conveying and feeding system, using plastic, enamel, aluminum, stainless steel and other materials.

5, product selection: seeking to buy polyacrylamide PAM products, as far as possible to * the provision of sewage / sludge to do polyacrylamide product selection test, due to the paper mill paper process using different raw materials and sewage treatment processes, water quality is still very different, still firmly believe that the right flocculant products can help companies save a lot of pharmaceutical costs, but also as far as possible to solve the problem of manufacturers to meet the standards of drainage. As a resident agent, filter aid, homogenizer, water treatment chemicals, etc.. Its role is to be able to improve the quality of paper, improve the performance of pulp dewatering, improve the retention rate of fine fibers and fillers, reduce the consumption of raw materials and pollution of the environment and so on. The effect of its use in papermaking depends on its average molecular weight, ionic nature, ionic strength and the activity of other copolymers. Nonionic paper mills special polyacrylamide PAM is mainly used to improve the filtration of pulp, increase dry paper strength, improve the retention rate of fibers and fillers; anionic paper mills special polyacrylamide is mainly used as wet and dry paper enhancers and resident agent; cationic paper mills special polyacrylamide is mainly used for paper wastewater treatment and filtration aids, and in addition to increase the retention of fillers also has a good effect. In addition, polyacrylamide PAM is also used in paper wastewater treatment and fiber recovery.

    Paper mill wastewater produced by the main characteristics of the water volume and high color, suspended solids content, high concentration of organic matter, the wastewater treatment is generally the main solution to the problem of removing SS and COD, the more popular treatment of papermaking wastewater methods such as air flotation, sedimentation, physical and biochemical treatment, etc., if you use the air flotation or precipitation methods, by adding coagulants (polymerization of aluminum chloride) and coagulants, so that it can be used for the treatment of papermaking wastewater and fiber recovery.